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Finding Greatest Common Divisor using LuaLatex

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.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;

7

1

Here is my code to find Greatest Common Divisor of two positive integers.

documentclassarticle
usepackageluacode

beginluacode
function gcd(a,b)
 if b ~= 0 then
 return gcd(b, a % b)
 else
 return math.abs(a)
 end
end
endluacode
newcommandfindgcd[2]directluatex.sprint(gcd(#1,#2))

begindocument
findgcd5,10
enddocument

It throws error. The expected output is simply gcd of 5 and 10. Is % sign in lua code causing the error?

luatex lua luacode directlua

share|improve this question

asked 11 hours ago

user61681user61681

38911 silver badge99 bronze badges

add a comment | 

7

1

Here is my code to find Greatest Common Divisor of two positive integers.

documentclassarticle
usepackageluacode

beginluacode
function gcd(a,b)
 if b ~= 0 then
 return gcd(b, a % b)
 else
 return math.abs(a)
 end
end
endluacode
newcommandfindgcd[2]directluatex.sprint(gcd(#1,#2))

begindocument
findgcd5,10
enddocument

It throws error. The expected output is simply gcd of 5 and 10. Is % sign in lua code causing the error?

luatex lua luacode directlua

share|improve this question

asked 11 hours ago

user61681user61681

38911 silver badge99 bronze badges

add a comment | 

Here is my code to find Greatest Common Divisor of two positive integers.

documentclassarticle
usepackageluacode

beginluacode
function gcd(a,b)
 if b ~= 0 then
 return gcd(b, a % b)
 else
 return math.abs(a)
 end
end
endluacode
newcommandfindgcd[2]directluatex.sprint(gcd(#1,#2))

begindocument
findgcd5,10
enddocument

It throws error. The expected output is simply gcd of 5 and 10. Is % sign in lua code causing the error?

luatex lua luacode directlua

share|improve this question

asked 11 hours ago

user61681user61681

38911 silver badge99 bronze badges

documentclassarticle
usepackageluacode

beginluacode
function gcd(a,b)
 if b ~= 0 then
 return gcd(b, a % b)
 else
 return math.abs(a)
 end
end
endluacode
newcommandfindgcd[2]directluatex.sprint(gcd(#1,#2))

begindocument
findgcd5,10
enddocument

share|improve this question

asked 11 hours ago

user61681user61681

38911 silver badge99 bronze badges

share|improve this question

asked 11 hours ago

user61681user61681

38911 silver badge99 bronze badges

asked 11 hours ago

user61681user61681

38911 silver badge99 bronze badges

asked 11 hours ago

user61681user61681

38911 silver badge99 bronze badges

1 Answer
1

active

oldest

votes

9

You have defined findgcd with two arguments, but you only supply one:

findgcd510

will work.

If you want the syntax findgcd5,10, then declare it:

documentclassarticle
usepackageluacode

beginluacode
function gcd(a,b)
 if b ~= 0 then
 return gcd(b, a % b)
 else
 return math.abs(a)
 end
end
endluacode

newcommandfindgcd[1]directluatex.sprint(gcd(#1))

begindocument
findgcd5,10
enddocument

Here's a simple package code, save as gcd.sty:

ProvidesPackagegcd[2019/07/22]
RequirePackageluacode

beginluacode
function gcd(a,b)
 if b ~= 0 then
 return gcd(b, a % b)
 else
 return math.abs(a)
 end
end
endluacode

newcommandfindgcd[2]directluatex.sprint(gcd(#1,#2))

endinput

Now your document, as soon as gcd.sty is in a directory read by the TeX engines, can be

documentclassarticle
usepackagegcd

begindocument
findgcd510
enddocument

share|improve this answer

edited 10 hours ago

answered 10 hours ago

egregegreg

756k9090 gold badges19791979 silver badges33253325 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is it possible to store this function as a package? I mean something like this. usepackagegcd and with this package findgcd command will be available to use it anywhere in document.
  
  – user61681
  10 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @user61681 Yes, write a package and upload it to CTAN.
  
  – egreg
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Could you share some resources? How to write package for this type of lua functions?
  
  – user61681
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Thanks for your detailed help. You are great...! Just one last query, though it is out of scope here. I am trying to learn how to write latex macros (own commands, environments etc.). I couldn't find any resources for that. I have programming background but still find it difficult to learn latex programming. Could you share some resources if you know? Thanks again.
  
  – user61681
  9 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @user61681 It's best if they're documented.
  
  – egreg
  9 hours ago
  

  
  
  
  

add a comment | 

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9

You have defined findgcd with two arguments, but you only supply one:

findgcd510

will work.

If you want the syntax findgcd5,10, then declare it:

documentclassarticle
usepackageluacode

beginluacode
function gcd(a,b)
 if b ~= 0 then
 return gcd(b, a % b)
 else
 return math.abs(a)
 end
end
endluacode

newcommandfindgcd[1]directluatex.sprint(gcd(#1))

begindocument
findgcd5,10
enddocument

Here's a simple package code, save as gcd.sty:

ProvidesPackagegcd[2019/07/22]
RequirePackageluacode

beginluacode
function gcd(a,b)
 if b ~= 0 then
 return gcd(b, a % b)
 else
 return math.abs(a)
 end
end
endluacode

newcommandfindgcd[2]directluatex.sprint(gcd(#1,#2))

endinput

Now your document, as soon as gcd.sty is in a directory read by the TeX engines, can be

documentclassarticle
usepackagegcd

begindocument
findgcd510
enddocument

share|improve this answer

edited 10 hours ago

answered 10 hours ago

egregegreg

756k9090 gold badges19791979 silver badges33253325 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is it possible to store this function as a package? I mean something like this. usepackagegcd and with this package findgcd command will be available to use it anywhere in document.
  
  – user61681
  10 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @user61681 Yes, write a package and upload it to CTAN.
  
  – egreg
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Could you share some resources? How to write package for this type of lua functions?
  
  – user61681
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Thanks for your detailed help. You are great...! Just one last query, though it is out of scope here. I am trying to learn how to write latex macros (own commands, environments etc.). I couldn't find any resources for that. I have programming background but still find it difficult to learn latex programming. Could you share some resources if you know? Thanks again.
  
  – user61681
  9 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @user61681 It's best if they're documented.
  
  – egreg
  9 hours ago
  

  
  
  
  

add a comment | 

9

You have defined findgcd with two arguments, but you only supply one:

findgcd510

will work.

If you want the syntax findgcd5,10, then declare it:

documentclassarticle
usepackageluacode

beginluacode
function gcd(a,b)
 if b ~= 0 then
 return gcd(b, a % b)
 else
 return math.abs(a)
 end
end
endluacode

newcommandfindgcd[1]directluatex.sprint(gcd(#1))

begindocument
findgcd5,10
enddocument

Here's a simple package code, save as gcd.sty:

ProvidesPackagegcd[2019/07/22]
RequirePackageluacode

beginluacode
function gcd(a,b)
 if b ~= 0 then
 return gcd(b, a % b)
 else
 return math.abs(a)
 end
end
endluacode

newcommandfindgcd[2]directluatex.sprint(gcd(#1,#2))

endinput

Now your document, as soon as gcd.sty is in a directory read by the TeX engines, can be

documentclassarticle
usepackagegcd

begindocument
findgcd510
enddocument

share|improve this answer

edited 10 hours ago

answered 10 hours ago

egregegreg

756k9090 gold badges19791979 silver badges33253325 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is it possible to store this function as a package? I mean something like this. usepackagegcd and with this package findgcd command will be available to use it anywhere in document.
  
  – user61681
  10 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @user61681 Yes, write a package and upload it to CTAN.
  
  – egreg
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Could you share some resources? How to write package for this type of lua functions?
  
  – user61681
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Thanks for your detailed help. You are great...! Just one last query, though it is out of scope here. I am trying to learn how to write latex macros (own commands, environments etc.). I couldn't find any resources for that. I have programming background but still find it difficult to learn latex programming. Could you share some resources if you know? Thanks again.
  
  – user61681
  9 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @user61681 It's best if they're documented.
  
  – egreg
  9 hours ago
  

  
  
  
  

add a comment | 

You have defined findgcd with two arguments, but you only supply one:

findgcd510

will work.

If you want the syntax findgcd5,10, then declare it:

documentclassarticle
usepackageluacode

beginluacode
function gcd(a,b)
 if b ~= 0 then
 return gcd(b, a % b)
 else
 return math.abs(a)
 end
end
endluacode

newcommandfindgcd[1]directluatex.sprint(gcd(#1))

begindocument
findgcd5,10
enddocument

Here's a simple package code, save as gcd.sty:

ProvidesPackagegcd[2019/07/22]
RequirePackageluacode

beginluacode
function gcd(a,b)
 if b ~= 0 then
 return gcd(b, a % b)
 else
 return math.abs(a)
 end
end
endluacode

newcommandfindgcd[2]directluatex.sprint(gcd(#1,#2))

endinput

Now your document, as soon as gcd.sty is in a directory read by the TeX engines, can be

documentclassarticle
usepackagegcd

begindocument
findgcd510
enddocument

share|improve this answer

edited 10 hours ago

answered 10 hours ago

egregegreg

756k9090 gold badges19791979 silver badges33253325 bronze badges

findgcd510

documentclassarticle
usepackageluacode

beginluacode
function gcd(a,b)
 if b ~= 0 then
 return gcd(b, a % b)
 else
 return math.abs(a)
 end
end
endluacode

newcommandfindgcd[1]directluatex.sprint(gcd(#1))

begindocument
findgcd5,10
enddocument

ProvidesPackagegcd[2019/07/22]
RequirePackageluacode

beginluacode
function gcd(a,b)
 if b ~= 0 then
 return gcd(b, a % b)
 else
 return math.abs(a)
 end
end
endluacode

newcommandfindgcd[2]directluatex.sprint(gcd(#1,#2))

endinput

documentclassarticle
usepackagegcd

begindocument
findgcd510
enddocument

share|improve this answer

edited 10 hours ago

answered 10 hours ago

egregegreg

756k9090 gold badges19791979 silver badges33253325 bronze badges

answered 10 hours ago

egregegreg

756k9090 gold badges19791979 silver badges33253325 bronze badges

answered 10 hours ago

egregegreg

756k9090 gold badges19791979 silver badges33253325 bronze badges