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Returning the argument of a function if the argument is not of the right type
Function argument to default under certain conditionDefine a function on a parameter argument set to zeroHow to make a function with its own options as well as passing options to other functionsCan I make a function which depends on several arguments which are not independent?Supply a function as an argument to another, and find its minimumTake the derivative of a function of time by another function of timeRemembering Previously Evaluated Function Values with Optional ArgumentImposing conditions on argument for a function definitionHow to make functional rules not depend on an argument?Saving remembered function when closing down notebook
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
$begingroup$
Best to give an example. Let us consider the function AdjacencyMatrix. When we pass, say a matrix to it, we get:
test = 1,1,1,1,2,2,3,3,3;
AdjacencyMatrix[%]
AdjacencyMatrix::graph: A graph object is expected at position 1 in AdjacencyMatrix[1,1,1,1,2,2,3,3,3].
AdjacencyMatrix[1, 1, 1, 1, 2, 2, 3, 3, 3]
Is there a way of modifying AdjacencyMatrix so that if the argument isn't a graph object it would simply return the argument itself?
functions attributes
asked 9 hours ago
amator2357amator2357
81210 bronze badges
$endgroup$
add a comment |
$begingroup$
Best to give an example. Let us consider the function AdjacencyMatrix. When we pass, say a matrix to it, we get:
test = 1,1,1,1,2,2,3,3,3;
AdjacencyMatrix[%]
AdjacencyMatrix::graph: A graph object is expected at position 1 in AdjacencyMatrix[1,1,1,1,2,2,3,3,3].
AdjacencyMatrix[1, 1, 1, 1, 2, 2, 3, 3, 3]
Is there a way of modifying AdjacencyMatrix so that if the argument isn't a graph object it would simply return the argument itself?
functions attributes
asked 9 hours ago
amator2357amator2357
81210 bronze badges
$endgroup$
$begingroup$
You wantAdjacencyMatrixto return the argument itself only when it is a matrix, or whenever it is not a graph?
$endgroup$
– AccidentalFourierTransform
8 hours ago
add a comment |
$begingroup$
Best to give an example. Let us consider the function AdjacencyMatrix. When we pass, say a matrix to it, we get:
test = 1,1,1,1,2,2,3,3,3;
AdjacencyMatrix[%]
AdjacencyMatrix::graph: A graph object is expected at position 1 in AdjacencyMatrix[1,1,1,1,2,2,3,3,3].
AdjacencyMatrix[1, 1, 1, 1, 2, 2, 3, 3, 3]
Is there a way of modifying AdjacencyMatrix so that if the argument isn't a graph object it would simply return the argument itself?
functions attributes
asked 9 hours ago
amator2357amator2357
81210 bronze badges
$endgroup$
Best to give an example. Let us consider the function AdjacencyMatrix. When we pass, say a matrix to it, we get:
test = 1,1,1,1,2,2,3,3,3;
AdjacencyMatrix[%]
AdjacencyMatrix::graph: A graph object is expected at position 1 in AdjacencyMatrix[1,1,1,1,2,2,3,3,3].
AdjacencyMatrix[1, 1, 1, 1, 2, 2, 3, 3, 3]
Is there a way of modifying AdjacencyMatrix so that if the argument isn't a graph object it would simply return the argument itself?
functions attributes
functions attributes
asked 9 hours ago
amator2357amator2357
81210 bronze badges
asked 9 hours ago
amator2357amator2357
81210 bronze badges
asked 9 hours ago
amator2357amator2357
81210 bronze badges
asked 9 hours ago
amator2357amator2357
81210 bronze badges
asked 9 hours ago
amator2357amator2357
81210 bronze badges
81210 bronze badges
$begingroup$
You wantAdjacencyMatrixto return the argument itself only when it is a matrix, or whenever it is not a graph?
$endgroup$
– AccidentalFourierTransform
8 hours ago
add a comment |
$begingroup$
You wantAdjacencyMatrixto return the argument itself only when it is a matrix, or whenever it is not a graph?
$endgroup$
– AccidentalFourierTransform
8 hours ago
$begingroup$
You want
AdjacencyMatrix to return the argument itself only when it is a matrix, or whenever it is not a graph?$endgroup$
– AccidentalFourierTransform
8 hours ago
$begingroup$
You want
AdjacencyMatrix to return the argument itself only when it is a matrix, or whenever it is not a graph?$endgroup$
– AccidentalFourierTransform
8 hours ago
add a comment |
2 Answers
2
active
oldest
votes
$begingroup$
You can use Check in a user defined function:
adjacencyMatrix[g_] := Check[AdjacencyMatrix[g], g]
Then:
adjacencyMatrix[Graph[1->2,2->3,3->4]] //Normal
adjacencyMatrix[1->2, 2->3, 3->4] //Normal
adjacencyMatrix[1,2,3,4]
0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0
0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0
AdjacencyMatrix::graph: A graph object is expected at position 1 in AdjacencyMatrix[1,2,3,4].
1, 2, 3, 4
answered 8 hours ago
Carl WollCarl Woll
86.8k3 gold badges114 silver badges221 bronze badges
$endgroup$
$begingroup$
This is much better than my approach. Note: OP may want to suppress the error message here:Quiet[Check[...], AdjacencyMatrix::graph].
$endgroup$
– AccidentalFourierTransform
33 mins ago
add a comment |
$begingroup$
Bad answer:
Unprotect[AdjacencyMatrix];
AdjacencyMatrix[mat_List] := mat
Protect[AdjacencyMatrix];
Good answer:
adjacencyMatrix[graph_Graph] := AdjacencyMatrix[graph]
adjacencyMatrix[mat_List] := mat
answered 9 hours ago
AccidentalFourierTransformAccidentalFourierTransform
6,2971 gold badge12 silver badges45 bronze badges
$endgroup$
$begingroup$
For the good answer, maybe remove the pattern headListon the second line, as this is the behavior requested for anything that's not aGraph.
$endgroup$
– Roman
8 hours ago
$begingroup$
@Roman good point. Let me ask OP to be sure. (If they only want the identity for matrices, then it is safer to leaveListin).
$endgroup$
– AccidentalFourierTransform
8 hours ago
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
$begingroup$
You can use Check in a user defined function:
adjacencyMatrix[g_] := Check[AdjacencyMatrix[g], g]
Then:
adjacencyMatrix[Graph[1->2,2->3,3->4]] //Normal
adjacencyMatrix[1->2, 2->3, 3->4] //Normal
adjacencyMatrix[1,2,3,4]
0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0
0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0
AdjacencyMatrix::graph: A graph object is expected at position 1 in AdjacencyMatrix[1,2,3,4].
1, 2, 3, 4
answered 8 hours ago
Carl WollCarl Woll
86.8k3 gold badges114 silver badges221 bronze badges
$endgroup$
$begingroup$
This is much better than my approach. Note: OP may want to suppress the error message here:Quiet[Check[...], AdjacencyMatrix::graph].
$endgroup$
– AccidentalFourierTransform
33 mins ago
add a comment |
$begingroup$
You can use Check in a user defined function:
adjacencyMatrix[g_] := Check[AdjacencyMatrix[g], g]
Then:
adjacencyMatrix[Graph[1->2,2->3,3->4]] //Normal
adjacencyMatrix[1->2, 2->3, 3->4] //Normal
adjacencyMatrix[1,2,3,4]
0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0
0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0
AdjacencyMatrix::graph: A graph object is expected at position 1 in AdjacencyMatrix[1,2,3,4].
1, 2, 3, 4
answered 8 hours ago
Carl WollCarl Woll
86.8k3 gold badges114 silver badges221 bronze badges
$endgroup$
$begingroup$
This is much better than my approach. Note: OP may want to suppress the error message here:Quiet[Check[...], AdjacencyMatrix::graph].
$endgroup$
– AccidentalFourierTransform
33 mins ago
add a comment |
$begingroup$
You can use Check in a user defined function:
adjacencyMatrix[g_] := Check[AdjacencyMatrix[g], g]
Then:
adjacencyMatrix[Graph[1->2,2->3,3->4]] //Normal
adjacencyMatrix[1->2, 2->3, 3->4] //Normal
adjacencyMatrix[1,2,3,4]
0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0
0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0
AdjacencyMatrix::graph: A graph object is expected at position 1 in AdjacencyMatrix[1,2,3,4].
1, 2, 3, 4
answered 8 hours ago
Carl WollCarl Woll
86.8k3 gold badges114 silver badges221 bronze badges
$endgroup$
You can use Check in a user defined function:
adjacencyMatrix[g_] := Check[AdjacencyMatrix[g], g]
Then:
adjacencyMatrix[Graph[1->2,2->3,3->4]] //Normal
adjacencyMatrix[1->2, 2->3, 3->4] //Normal
adjacencyMatrix[1,2,3,4]
0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0
0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0
AdjacencyMatrix::graph: A graph object is expected at position 1 in AdjacencyMatrix[1,2,3,4].
1, 2, 3, 4
answered 8 hours ago
Carl WollCarl Woll
86.8k3 gold badges114 silver badges221 bronze badges
answered 8 hours ago
Carl WollCarl Woll
86.8k3 gold badges114 silver badges221 bronze badges
answered 8 hours ago
Carl WollCarl Woll
86.8k3 gold badges114 silver badges221 bronze badges
answered 8 hours ago
Carl WollCarl Woll
86.8k3 gold badges114 silver badges221 bronze badges
86.8k3 gold badges114 silver badges221 bronze badges
$begingroup$
This is much better than my approach. Note: OP may want to suppress the error message here:Quiet[Check[...], AdjacencyMatrix::graph].
$endgroup$
– AccidentalFourierTransform
33 mins ago
add a comment |
$begingroup$
This is much better than my approach. Note: OP may want to suppress the error message here:Quiet[Check[...], AdjacencyMatrix::graph].
$endgroup$
– AccidentalFourierTransform
33 mins ago
$begingroup$
This is much better than my approach. Note: OP may want to suppress the error message here:
Quiet[Check[...], AdjacencyMatrix::graph].$endgroup$
– AccidentalFourierTransform
33 mins ago
$begingroup$
This is much better than my approach. Note: OP may want to suppress the error message here:
Quiet[Check[...], AdjacencyMatrix::graph].$endgroup$
– AccidentalFourierTransform
33 mins ago
add a comment |
$begingroup$
Bad answer:
Unprotect[AdjacencyMatrix];
AdjacencyMatrix[mat_List] := mat
Protect[AdjacencyMatrix];
Good answer:
adjacencyMatrix[graph_Graph] := AdjacencyMatrix[graph]
adjacencyMatrix[mat_List] := mat
answered 9 hours ago
AccidentalFourierTransformAccidentalFourierTransform
6,2971 gold badge12 silver badges45 bronze badges
$endgroup$
$begingroup$
For the good answer, maybe remove the pattern headListon the second line, as this is the behavior requested for anything that's not aGraph.
$endgroup$
– Roman
8 hours ago
$begingroup$
@Roman good point. Let me ask OP to be sure. (If they only want the identity for matrices, then it is safer to leaveListin).
$endgroup$
– AccidentalFourierTransform
8 hours ago
add a comment |
$begingroup$
Bad answer:
Unprotect[AdjacencyMatrix];
AdjacencyMatrix[mat_List] := mat
Protect[AdjacencyMatrix];
Good answer:
adjacencyMatrix[graph_Graph] := AdjacencyMatrix[graph]
adjacencyMatrix[mat_List] := mat
answered 9 hours ago
AccidentalFourierTransformAccidentalFourierTransform
6,2971 gold badge12 silver badges45 bronze badges
$endgroup$
$begingroup$
For the good answer, maybe remove the pattern headListon the second line, as this is the behavior requested for anything that's not aGraph.
$endgroup$
– Roman
8 hours ago
$begingroup$
@Roman good point. Let me ask OP to be sure. (If they only want the identity for matrices, then it is safer to leaveListin).
$endgroup$
– AccidentalFourierTransform
8 hours ago
add a comment |
$begingroup$
Bad answer:
Unprotect[AdjacencyMatrix];
AdjacencyMatrix[mat_List] := mat
Protect[AdjacencyMatrix];
Good answer:
adjacencyMatrix[graph_Graph] := AdjacencyMatrix[graph]
adjacencyMatrix[mat_List] := mat
answered 9 hours ago
AccidentalFourierTransformAccidentalFourierTransform
6,2971 gold badge12 silver badges45 bronze badges
$endgroup$
Bad answer:
Unprotect[AdjacencyMatrix];
AdjacencyMatrix[mat_List] := mat
Protect[AdjacencyMatrix];
Good answer:
adjacencyMatrix[graph_Graph] := AdjacencyMatrix[graph]
adjacencyMatrix[mat_List] := mat
answered 9 hours ago
AccidentalFourierTransformAccidentalFourierTransform
6,2971 gold badge12 silver badges45 bronze badges
answered 9 hours ago
AccidentalFourierTransformAccidentalFourierTransform
6,2971 gold badge12 silver badges45 bronze badges
answered 9 hours ago
AccidentalFourierTransformAccidentalFourierTransform
6,2971 gold badge12 silver badges45 bronze badges
answered 9 hours ago
AccidentalFourierTransformAccidentalFourierTransform
6,2971 gold badge12 silver badges45 bronze badges
6,2971 gold badge12 silver badges45 bronze badges
$begingroup$
For the good answer, maybe remove the pattern headListon the second line, as this is the behavior requested for anything that's not aGraph.
$endgroup$
– Roman
8 hours ago
$begingroup$
@Roman good point. Let me ask OP to be sure. (If they only want the identity for matrices, then it is safer to leaveListin).
$endgroup$
– AccidentalFourierTransform
8 hours ago
add a comment |
$begingroup$
For the good answer, maybe remove the pattern headListon the second line, as this is the behavior requested for anything that's not aGraph.
$endgroup$
– Roman
8 hours ago
$begingroup$
@Roman good point. Let me ask OP to be sure. (If they only want the identity for matrices, then it is safer to leaveListin).
$endgroup$
– AccidentalFourierTransform
8 hours ago
$begingroup$
For the good answer, maybe remove the pattern head
List on the second line, as this is the behavior requested for anything that's not a Graph.$endgroup$
– Roman
8 hours ago
$begingroup$
For the good answer, maybe remove the pattern head
List on the second line, as this is the behavior requested for anything that's not a Graph.$endgroup$
– Roman
8 hours ago
$begingroup$
@Roman good point. Let me ask OP to be sure. (If they only want the identity for matrices, then it is safer to leave
List in).$endgroup$
– AccidentalFourierTransform
8 hours ago
$begingroup$
@Roman good point. Let me ask OP to be sure. (If they only want the identity for matrices, then it is safer to leave
List in).$endgroup$
– AccidentalFourierTransform
8 hours ago
add a comment |
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$begingroup$
You want
AdjacencyMatrixto return the argument itself only when it is a matrix, or whenever it is not a graph?$endgroup$
– AccidentalFourierTransform
8 hours ago