Better random (unique) file nameWhat will happen, if I don't specify random seed by SeedRandom function?Generating unique random number listsHow to generate a unique file name similar as that created by CreateTemporaryUse modified part of file path as new file nameHow to return notebook's own file nameWhy doesn't SeedRandom work here?Get (<<) Evaluate File NameRandom phases at each run in a wave superpositionRandom given nameRandom number generation within Compile and Parallelization->TrueMultiple unique random samples?
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Better random (unique) file name
What will happen, if I don't specify random seed by SeedRandom function?Generating unique random number listsHow to generate a unique file name similar as that created by CreateTemporaryUse modified part of file path as new file nameHow to return notebook's own file nameWhy doesn't SeedRandom work here?Get (<<) Evaluate File NameRandom phases at each run in a wave superpositionRandom given nameRandom number generation within Compile and Parallelization->TrueMultiple unique random samples?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
$begingroup$
In order to avoid conflict with file names produced by some code running in multiple instances of Mathematica I append the date and a random string at the end hoping to create a unique filename.
The date is good enough most of the time but the random integer is there for the (unlikely) event that two files get created in the same second. I create it with:
Random[Integer,10^5]
Now lately I found out this is completely useless, because it seems the multiple instances of Mathematica will use exactly the same data to create a random number creating exactly the same random integer.
What is a simple way to get a better random integer that is not the same when multiple instances of Mathematica run the same code at almost exactly the same time?
random files-and-directories unique
edited 8 hours ago
rhermans
22.3k4 gold badges41 silver badges107 bronze badges
asked 9 hours ago
KvotheKvothe
1,0603 silver badges18 bronze badges
$endgroup$
|
show 2 more comments
$begingroup$
In order to avoid conflict with file names produced by some code running in multiple instances of Mathematica I append the date and a random string at the end hoping to create a unique filename.
The date is good enough most of the time but the random integer is there for the (unlikely) event that two files get created in the same second. I create it with:
Random[Integer,10^5]
Now lately I found out this is completely useless, because it seems the multiple instances of Mathematica will use exactly the same data to create a random number creating exactly the same random integer.
What is a simple way to get a better random integer that is not the same when multiple instances of Mathematica run the same code at almost exactly the same time?
random files-and-directories unique
edited 8 hours ago
rhermans
22.3k4 gold badges41 silver badges107 bronze badges
asked 9 hours ago
KvotheKvothe
1,0603 silver badges18 bronze badges
$endgroup$
1
$begingroup$
One possibility would be to use SeedRandom (for example, use the time of day to set the seed at the start of the process). Or maybe to create the file names sequentially rather than randomly.
$endgroup$
– bill s
9 hours ago
3
$begingroup$
Why not use unique information such as$ProcessIDor even better$SessionID?
$endgroup$
– rhermans
9 hours ago
2
$begingroup$
Related: mathematica.stackexchange.com/a/99795/12 I thought recent versions will never start with the same seed, even if they start at the same time. What you describe just should not happen.
$endgroup$
– Szabolcs
9 hours ago
$begingroup$
@Szabolcs, ah that depends on how recent it needs to be. Indeed I should have added the version where I encountered this which is indeed a bit outdated (11.1.1 for Linux x86 (64-bit)).
$endgroup$
– Kvothe
7 hours ago
$begingroup$
@bill, how would I do this? I might need to read the documentation on SeedRandom more clearly but it seems it would not help here. The idea is that the code should produce different output for the same nb (and possibly the same time or very close to it on the system clock), without having to change anything in the .nb, such as the n in SeedRandom manually.
$endgroup$
– Kvothe
7 hours ago
|
show 2 more comments
$begingroup$
In order to avoid conflict with file names produced by some code running in multiple instances of Mathematica I append the date and a random string at the end hoping to create a unique filename.
The date is good enough most of the time but the random integer is there for the (unlikely) event that two files get created in the same second. I create it with:
Random[Integer,10^5]
Now lately I found out this is completely useless, because it seems the multiple instances of Mathematica will use exactly the same data to create a random number creating exactly the same random integer.
What is a simple way to get a better random integer that is not the same when multiple instances of Mathematica run the same code at almost exactly the same time?
random files-and-directories unique
edited 8 hours ago
rhermans
22.3k4 gold badges41 silver badges107 bronze badges
asked 9 hours ago
KvotheKvothe
1,0603 silver badges18 bronze badges
$endgroup$
In order to avoid conflict with file names produced by some code running in multiple instances of Mathematica I append the date and a random string at the end hoping to create a unique filename.
The date is good enough most of the time but the random integer is there for the (unlikely) event that two files get created in the same second. I create it with:
Random[Integer,10^5]
Now lately I found out this is completely useless, because it seems the multiple instances of Mathematica will use exactly the same data to create a random number creating exactly the same random integer.
What is a simple way to get a better random integer that is not the same when multiple instances of Mathematica run the same code at almost exactly the same time?
random files-and-directories unique
random files-and-directories unique
edited 8 hours ago
rhermans
22.3k4 gold badges41 silver badges107 bronze badges
asked 9 hours ago
KvotheKvothe
1,0603 silver badges18 bronze badges
edited 8 hours ago
rhermans
22.3k4 gold badges41 silver badges107 bronze badges
asked 9 hours ago
KvotheKvothe
1,0603 silver badges18 bronze badges
edited 8 hours ago
rhermans
22.3k4 gold badges41 silver badges107 bronze badges
edited 8 hours ago
rhermans
22.3k4 gold badges41 silver badges107 bronze badges
edited 8 hours ago
rhermans
22.3k4 gold badges41 silver badges107 bronze badges
22.3k4 gold badges41 silver badges107 bronze badges
asked 9 hours ago
KvotheKvothe
1,0603 silver badges18 bronze badges
asked 9 hours ago
KvotheKvothe
1,0603 silver badges18 bronze badges
asked 9 hours ago
KvotheKvothe
1,0603 silver badges18 bronze badges
1,0603 silver badges18 bronze badges
1
$begingroup$
One possibility would be to use SeedRandom (for example, use the time of day to set the seed at the start of the process). Or maybe to create the file names sequentially rather than randomly.
$endgroup$
– bill s
9 hours ago
3
$begingroup$
Why not use unique information such as$ProcessIDor even better$SessionID?
$endgroup$
– rhermans
9 hours ago
2
$begingroup$
Related: mathematica.stackexchange.com/a/99795/12 I thought recent versions will never start with the same seed, even if they start at the same time. What you describe just should not happen.
$endgroup$
– Szabolcs
9 hours ago
$begingroup$
@Szabolcs, ah that depends on how recent it needs to be. Indeed I should have added the version where I encountered this which is indeed a bit outdated (11.1.1 for Linux x86 (64-bit)).
$endgroup$
– Kvothe
7 hours ago
$begingroup$
@bill, how would I do this? I might need to read the documentation on SeedRandom more clearly but it seems it would not help here. The idea is that the code should produce different output for the same nb (and possibly the same time or very close to it on the system clock), without having to change anything in the .nb, such as the n in SeedRandom manually.
$endgroup$
– Kvothe
7 hours ago
|
show 2 more comments
1
$begingroup$
One possibility would be to use SeedRandom (for example, use the time of day to set the seed at the start of the process). Or maybe to create the file names sequentially rather than randomly.
$endgroup$
– bill s
9 hours ago
3
$begingroup$
Why not use unique information such as$ProcessIDor even better$SessionID?
$endgroup$
– rhermans
9 hours ago
2
$begingroup$
Related: mathematica.stackexchange.com/a/99795/12 I thought recent versions will never start with the same seed, even if they start at the same time. What you describe just should not happen.
$endgroup$
– Szabolcs
9 hours ago
$begingroup$
@Szabolcs, ah that depends on how recent it needs to be. Indeed I should have added the version where I encountered this which is indeed a bit outdated (11.1.1 for Linux x86 (64-bit)).
$endgroup$
– Kvothe
7 hours ago
$begingroup$
@bill, how would I do this? I might need to read the documentation on SeedRandom more clearly but it seems it would not help here. The idea is that the code should produce different output for the same nb (and possibly the same time or very close to it on the system clock), without having to change anything in the .nb, such as the n in SeedRandom manually.
$endgroup$
– Kvothe
7 hours ago
1
1
$begingroup$
One possibility would be to use SeedRandom (for example, use the time of day to set the seed at the start of the process). Or maybe to create the file names sequentially rather than randomly.
$endgroup$
– bill s
9 hours ago
$begingroup$
One possibility would be to use SeedRandom (for example, use the time of day to set the seed at the start of the process). Or maybe to create the file names sequentially rather than randomly.
$endgroup$
– bill s
9 hours ago
3
3
$begingroup$
Why not use unique information such as
$ProcessID or even better $SessionID ?$endgroup$
– rhermans
9 hours ago
$begingroup$
Why not use unique information such as
$ProcessID or even better $SessionID ?$endgroup$
– rhermans
9 hours ago
2
2
$begingroup$
Related: mathematica.stackexchange.com/a/99795/12 I thought recent versions will never start with the same seed, even if they start at the same time. What you describe just should not happen.
$endgroup$
– Szabolcs
9 hours ago
$begingroup$
Related: mathematica.stackexchange.com/a/99795/12 I thought recent versions will never start with the same seed, even if they start at the same time. What you describe just should not happen.
$endgroup$
– Szabolcs
9 hours ago
$begingroup$
@Szabolcs, ah that depends on how recent it needs to be. Indeed I should have added the version where I encountered this which is indeed a bit outdated (11.1.1 for Linux x86 (64-bit)).
$endgroup$
– Kvothe
7 hours ago
$begingroup$
@Szabolcs, ah that depends on how recent it needs to be. Indeed I should have added the version where I encountered this which is indeed a bit outdated (11.1.1 for Linux x86 (64-bit)).
$endgroup$
– Kvothe
7 hours ago
$begingroup$
@bill, how would I do this? I might need to read the documentation on SeedRandom more clearly but it seems it would not help here. The idea is that the code should produce different output for the same nb (and possibly the same time or very close to it on the system clock), without having to change anything in the .nb, such as the n in SeedRandom manually.
$endgroup$
– Kvothe
7 hours ago
$begingroup$
@bill, how would I do this? I might need to read the documentation on SeedRandom more clearly but it seems it would not help here. The idea is that the code should produce different output for the same nb (and possibly the same time or very close to it on the system clock), without having to change anything in the .nb, such as the n in SeedRandom manually.
$endgroup$
– Kvothe
7 hours ago
|
show 2 more comments
2 Answers
2
active
oldest
votes
$begingroup$
It might be best to use CreateUUID.
CreateUUID[]
"73ccc27c-687f-4eca-8214-ceeb8a8b7773"
The Properties & Relations section shows a way to express this string as an integer if that's what you're after:
FromDigits[StringReplace[CreateUUID[], "-" -> ""], 16]
296740835687065620982102887154699649600
answered 9 hours ago
Chip HurstChip Hurst
25k1 gold badge61 silver badges98 bronze badges
$endgroup$
1
$begingroup$
I don't think this is a very good idea, adding an empty-digit number to a file name. UUIDs have their uses, but this shouldn't be one of them.
$endgroup$
– High Performance Mark
8 hours ago
$begingroup$
In my previous comment I wrote umpty-digit number, which got autocorrected to something meaningless.
$endgroup$
– High Performance Mark
7 hours ago
1
$begingroup$
Why do you think it is a bad idea, @HighPerformanceMark?
$endgroup$
– user6014
6 hours ago
$begingroup$
In this case the question seeks a way to disambiguate file names generated by different processes at approximately the same time; about 90% of the digits of the UUID are wasted for this. More generally, UUIDs are a non-human-friendly way of identifying resources. Quickly now, are the following twoUUIDsthe same ...7adba397-30fa-45a4-9bd3-6283712a942c,7adba397-30fa-45a4-9bd3-6283712a942c?
$endgroup$
– High Performance Mark
5 hours ago
add a comment |
$begingroup$
This should give you a string that are unique. It uses $SessionID and $ProcessID which are a unique combination by definition.
Short name, almost unique.
Hash in "Base36String" to keep the string short (28 characters). It has the date and $KernelID in plain text for easy identification.
StringJoin[
Riffle[
Hash[$SessionID , $ProcessID, "CRC32", "Base36String"],
DateString["Year", "MonthNameShort", "Day", "Hour24", "Minute",
"Second", "MillisecondShort"],
ToString[$KernelID]
, "-"]
]
"02y4q0o-2019Jul04180113431-0"
Long names, absolutely unique
If you can afford extremely long names, you could leave $SessionID and $ProcessID unhashed.
You can shorten the string length also using IntegerString with "Base64" encoding.
StringJoin[
Riffle[
Flatten@
StringDelete[
IntegerString[$SessionID , $ProcessID, "Base64"], "+", "/",
"="],
DateString["Year", "MonthNameShort", "Day", "Hour24", "Minute",
"Second", "MillisecondShort"],
ToString[$KernelID]
, "-"]
]
Otherwise use them to define folder (directory) names.
FileNameJoin[
ToString /@
$MachineName,
$SessionID ,
$ProcessID,
DateString[
"Year",
"MonthNameShort",
"Day",
"Hour24",
"Minute",
"Second",
"MillisecondShort"
]
]
answered 7 hours ago
rhermansrhermans
22.3k4 gold badges41 silver badges107 bronze badges
$endgroup$
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
It might be best to use CreateUUID.
CreateUUID[]
"73ccc27c-687f-4eca-8214-ceeb8a8b7773"
The Properties & Relations section shows a way to express this string as an integer if that's what you're after:
FromDigits[StringReplace[CreateUUID[], "-" -> ""], 16]
296740835687065620982102887154699649600
answered 9 hours ago
Chip HurstChip Hurst
25k1 gold badge61 silver badges98 bronze badges
$endgroup$
1
$begingroup$
I don't think this is a very good idea, adding an empty-digit number to a file name. UUIDs have their uses, but this shouldn't be one of them.
$endgroup$
– High Performance Mark
8 hours ago
$begingroup$
In my previous comment I wrote umpty-digit number, which got autocorrected to something meaningless.
$endgroup$
– High Performance Mark
7 hours ago
1
$begingroup$
Why do you think it is a bad idea, @HighPerformanceMark?
$endgroup$
– user6014
6 hours ago
$begingroup$
In this case the question seeks a way to disambiguate file names generated by different processes at approximately the same time; about 90% of the digits of the UUID are wasted for this. More generally, UUIDs are a non-human-friendly way of identifying resources. Quickly now, are the following twoUUIDsthe same ...7adba397-30fa-45a4-9bd3-6283712a942c,7adba397-30fa-45a4-9bd3-6283712a942c?
$endgroup$
– High Performance Mark
5 hours ago
add a comment |
$begingroup$
It might be best to use CreateUUID.
CreateUUID[]
"73ccc27c-687f-4eca-8214-ceeb8a8b7773"
The Properties & Relations section shows a way to express this string as an integer if that's what you're after:
FromDigits[StringReplace[CreateUUID[], "-" -> ""], 16]
296740835687065620982102887154699649600
answered 9 hours ago
Chip HurstChip Hurst
25k1 gold badge61 silver badges98 bronze badges
$endgroup$
1
$begingroup$
I don't think this is a very good idea, adding an empty-digit number to a file name. UUIDs have their uses, but this shouldn't be one of them.
$endgroup$
– High Performance Mark
8 hours ago
$begingroup$
In my previous comment I wrote umpty-digit number, which got autocorrected to something meaningless.
$endgroup$
– High Performance Mark
7 hours ago
1
$begingroup$
Why do you think it is a bad idea, @HighPerformanceMark?
$endgroup$
– user6014
6 hours ago
$begingroup$
In this case the question seeks a way to disambiguate file names generated by different processes at approximately the same time; about 90% of the digits of the UUID are wasted for this. More generally, UUIDs are a non-human-friendly way of identifying resources. Quickly now, are the following twoUUIDsthe same ...7adba397-30fa-45a4-9bd3-6283712a942c,7adba397-30fa-45a4-9bd3-6283712a942c?
$endgroup$
– High Performance Mark
5 hours ago
add a comment |
$begingroup$
It might be best to use CreateUUID.
CreateUUID[]
"73ccc27c-687f-4eca-8214-ceeb8a8b7773"
The Properties & Relations section shows a way to express this string as an integer if that's what you're after:
FromDigits[StringReplace[CreateUUID[], "-" -> ""], 16]
296740835687065620982102887154699649600
answered 9 hours ago
Chip HurstChip Hurst
25k1 gold badge61 silver badges98 bronze badges
$endgroup$
It might be best to use CreateUUID.
CreateUUID[]
"73ccc27c-687f-4eca-8214-ceeb8a8b7773"
The Properties & Relations section shows a way to express this string as an integer if that's what you're after:
FromDigits[StringReplace[CreateUUID[], "-" -> ""], 16]
296740835687065620982102887154699649600
answered 9 hours ago
Chip HurstChip Hurst
25k1 gold badge61 silver badges98 bronze badges
answered 9 hours ago
Chip HurstChip Hurst
25k1 gold badge61 silver badges98 bronze badges
answered 9 hours ago
Chip HurstChip Hurst
25k1 gold badge61 silver badges98 bronze badges
answered 9 hours ago
Chip HurstChip Hurst
25k1 gold badge61 silver badges98 bronze badges
25k1 gold badge61 silver badges98 bronze badges
1
$begingroup$
I don't think this is a very good idea, adding an empty-digit number to a file name. UUIDs have their uses, but this shouldn't be one of them.
$endgroup$
– High Performance Mark
8 hours ago
$begingroup$
In my previous comment I wrote umpty-digit number, which got autocorrected to something meaningless.
$endgroup$
– High Performance Mark
7 hours ago
1
$begingroup$
Why do you think it is a bad idea, @HighPerformanceMark?
$endgroup$
– user6014
6 hours ago
$begingroup$
In this case the question seeks a way to disambiguate file names generated by different processes at approximately the same time; about 90% of the digits of the UUID are wasted for this. More generally, UUIDs are a non-human-friendly way of identifying resources. Quickly now, are the following twoUUIDsthe same ...7adba397-30fa-45a4-9bd3-6283712a942c,7adba397-30fa-45a4-9bd3-6283712a942c?
$endgroup$
– High Performance Mark
5 hours ago
add a comment |
1
$begingroup$
I don't think this is a very good idea, adding an empty-digit number to a file name. UUIDs have their uses, but this shouldn't be one of them.
$endgroup$
– High Performance Mark
8 hours ago
$begingroup$
In my previous comment I wrote umpty-digit number, which got autocorrected to something meaningless.
$endgroup$
– High Performance Mark
7 hours ago
1
$begingroup$
Why do you think it is a bad idea, @HighPerformanceMark?
$endgroup$
– user6014
6 hours ago
$begingroup$
In this case the question seeks a way to disambiguate file names generated by different processes at approximately the same time; about 90% of the digits of the UUID are wasted for this. More generally, UUIDs are a non-human-friendly way of identifying resources. Quickly now, are the following twoUUIDsthe same ...7adba397-30fa-45a4-9bd3-6283712a942c,7adba397-30fa-45a4-9bd3-6283712a942c?
$endgroup$
– High Performance Mark
5 hours ago
1
1
$begingroup$
I don't think this is a very good idea, adding an empty-digit number to a file name. UUIDs have their uses, but this shouldn't be one of them.
$endgroup$
– High Performance Mark
8 hours ago
$begingroup$
I don't think this is a very good idea, adding an empty-digit number to a file name. UUIDs have their uses, but this shouldn't be one of them.
$endgroup$
– High Performance Mark
8 hours ago
$begingroup$
In my previous comment I wrote umpty-digit number, which got autocorrected to something meaningless.
$endgroup$
– High Performance Mark
7 hours ago
$begingroup$
In my previous comment I wrote umpty-digit number, which got autocorrected to something meaningless.
$endgroup$
– High Performance Mark
7 hours ago
1
1
$begingroup$
Why do you think it is a bad idea, @HighPerformanceMark?
$endgroup$
– user6014
6 hours ago
$begingroup$
Why do you think it is a bad idea, @HighPerformanceMark?
$endgroup$
– user6014
6 hours ago
$begingroup$
In this case the question seeks a way to disambiguate file names generated by different processes at approximately the same time; about 90% of the digits of the UUID are wasted for this. More generally, UUIDs are a non-human-friendly way of identifying resources. Quickly now, are the following two
UUIDs the same ... 7adba397-30fa-45a4-9bd3-6283712a942c, 7adba397-30fa-45a4-9bd3-6283712a942c ?$endgroup$
– High Performance Mark
5 hours ago
$begingroup$
In this case the question seeks a way to disambiguate file names generated by different processes at approximately the same time; about 90% of the digits of the UUID are wasted for this. More generally, UUIDs are a non-human-friendly way of identifying resources. Quickly now, are the following two
UUIDs the same ... 7adba397-30fa-45a4-9bd3-6283712a942c, 7adba397-30fa-45a4-9bd3-6283712a942c ?$endgroup$
– High Performance Mark
5 hours ago
add a comment |
$begingroup$
This should give you a string that are unique. It uses $SessionID and $ProcessID which are a unique combination by definition.
Short name, almost unique.
Hash in "Base36String" to keep the string short (28 characters). It has the date and $KernelID in plain text for easy identification.
StringJoin[
Riffle[
Hash[$SessionID , $ProcessID, "CRC32", "Base36String"],
DateString["Year", "MonthNameShort", "Day", "Hour24", "Minute",
"Second", "MillisecondShort"],
ToString[$KernelID]
, "-"]
]
"02y4q0o-2019Jul04180113431-0"
Long names, absolutely unique
If you can afford extremely long names, you could leave $SessionID and $ProcessID unhashed.
You can shorten the string length also using IntegerString with "Base64" encoding.
StringJoin[
Riffle[
Flatten@
StringDelete[
IntegerString[$SessionID , $ProcessID, "Base64"], "+", "/",
"="],
DateString["Year", "MonthNameShort", "Day", "Hour24", "Minute",
"Second", "MillisecondShort"],
ToString[$KernelID]
, "-"]
]
Otherwise use them to define folder (directory) names.
FileNameJoin[
ToString /@
$MachineName,
$SessionID ,
$ProcessID,
DateString[
"Year",
"MonthNameShort",
"Day",
"Hour24",
"Minute",
"Second",
"MillisecondShort"
]
]
answered 7 hours ago
rhermansrhermans
22.3k4 gold badges41 silver badges107 bronze badges
$endgroup$
add a comment |
$begingroup$
This should give you a string that are unique. It uses $SessionID and $ProcessID which are a unique combination by definition.
Short name, almost unique.
Hash in "Base36String" to keep the string short (28 characters). It has the date and $KernelID in plain text for easy identification.
StringJoin[
Riffle[
Hash[$SessionID , $ProcessID, "CRC32", "Base36String"],
DateString["Year", "MonthNameShort", "Day", "Hour24", "Minute",
"Second", "MillisecondShort"],
ToString[$KernelID]
, "-"]
]
"02y4q0o-2019Jul04180113431-0"
Long names, absolutely unique
If you can afford extremely long names, you could leave $SessionID and $ProcessID unhashed.
You can shorten the string length also using IntegerString with "Base64" encoding.
StringJoin[
Riffle[
Flatten@
StringDelete[
IntegerString[$SessionID , $ProcessID, "Base64"], "+", "/",
"="],
DateString["Year", "MonthNameShort", "Day", "Hour24", "Minute",
"Second", "MillisecondShort"],
ToString[$KernelID]
, "-"]
]
Otherwise use them to define folder (directory) names.
FileNameJoin[
ToString /@
$MachineName,
$SessionID ,
$ProcessID,
DateString[
"Year",
"MonthNameShort",
"Day",
"Hour24",
"Minute",
"Second",
"MillisecondShort"
]
]
answered 7 hours ago
rhermansrhermans
22.3k4 gold badges41 silver badges107 bronze badges
$endgroup$
add a comment |
$begingroup$
This should give you a string that are unique. It uses $SessionID and $ProcessID which are a unique combination by definition.
Short name, almost unique.
Hash in "Base36String" to keep the string short (28 characters). It has the date and $KernelID in plain text for easy identification.
StringJoin[
Riffle[
Hash[$SessionID , $ProcessID, "CRC32", "Base36String"],
DateString["Year", "MonthNameShort", "Day", "Hour24", "Minute",
"Second", "MillisecondShort"],
ToString[$KernelID]
, "-"]
]
"02y4q0o-2019Jul04180113431-0"
Long names, absolutely unique
If you can afford extremely long names, you could leave $SessionID and $ProcessID unhashed.
You can shorten the string length also using IntegerString with "Base64" encoding.
StringJoin[
Riffle[
Flatten@
StringDelete[
IntegerString[$SessionID , $ProcessID, "Base64"], "+", "/",
"="],
DateString["Year", "MonthNameShort", "Day", "Hour24", "Minute",
"Second", "MillisecondShort"],
ToString[$KernelID]
, "-"]
]
Otherwise use them to define folder (directory) names.
FileNameJoin[
ToString /@
$MachineName,
$SessionID ,
$ProcessID,
DateString[
"Year",
"MonthNameShort",
"Day",
"Hour24",
"Minute",
"Second",
"MillisecondShort"
]
]
answered 7 hours ago
rhermansrhermans
22.3k4 gold badges41 silver badges107 bronze badges
$endgroup$
This should give you a string that are unique. It uses $SessionID and $ProcessID which are a unique combination by definition.
Short name, almost unique.
Hash in "Base36String" to keep the string short (28 characters). It has the date and $KernelID in plain text for easy identification.
StringJoin[
Riffle[
Hash[$SessionID , $ProcessID, "CRC32", "Base36String"],
DateString["Year", "MonthNameShort", "Day", "Hour24", "Minute",
"Second", "MillisecondShort"],
ToString[$KernelID]
, "-"]
]
"02y4q0o-2019Jul04180113431-0"
Long names, absolutely unique
If you can afford extremely long names, you could leave $SessionID and $ProcessID unhashed.
You can shorten the string length also using IntegerString with "Base64" encoding.
StringJoin[
Riffle[
Flatten@
StringDelete[
IntegerString[$SessionID , $ProcessID, "Base64"], "+", "/",
"="],
DateString["Year", "MonthNameShort", "Day", "Hour24", "Minute",
"Second", "MillisecondShort"],
ToString[$KernelID]
, "-"]
]
Otherwise use them to define folder (directory) names.
FileNameJoin[
ToString /@
$MachineName,
$SessionID ,
$ProcessID,
DateString[
"Year",
"MonthNameShort",
"Day",
"Hour24",
"Minute",
"Second",
"MillisecondShort"
]
]
answered 7 hours ago
rhermansrhermans
22.3k4 gold badges41 silver badges107 bronze badges
edited 6 hours ago
answered 7 hours ago
rhermansrhermans
22.3k4 gold badges41 silver badges107 bronze badges
answered 7 hours ago
rhermansrhermans
22.3k4 gold badges41 silver badges107 bronze badges
answered 7 hours ago
rhermansrhermans
22.3k4 gold badges41 silver badges107 bronze badges
22.3k4 gold badges41 silver badges107 bronze badges
add a comment |
add a comment |
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1
$begingroup$
One possibility would be to use SeedRandom (for example, use the time of day to set the seed at the start of the process). Or maybe to create the file names sequentially rather than randomly.
$endgroup$
– bill s
9 hours ago
3
$begingroup$
Why not use unique information such as
$ProcessIDor even better$SessionID?$endgroup$
– rhermans
9 hours ago
2
$begingroup$
Related: mathematica.stackexchange.com/a/99795/12 I thought recent versions will never start with the same seed, even if they start at the same time. What you describe just should not happen.
$endgroup$
– Szabolcs
9 hours ago
$begingroup$
@Szabolcs, ah that depends on how recent it needs to be. Indeed I should have added the version where I encountered this which is indeed a bit outdated (11.1.1 for Linux x86 (64-bit)).
$endgroup$
– Kvothe
7 hours ago
$begingroup$
@bill, how would I do this? I might need to read the documentation on SeedRandom more clearly but it seems it would not help here. The idea is that the code should produce different output for the same nb (and possibly the same time or very close to it on the system clock), without having to change anything in the .nb, such as the n in SeedRandom manually.
$endgroup$
– Kvothe
7 hours ago