All Questions
17 questions
1
vote
1
answer
81
views
Can not get OptionValue with SetDelayed variable
ClearAll[foo1];
foo1[OptionsPattern[]] := Hold[OptionValue[""]][[1, 1]]
foo1[]
gives function name
foo1
But
...
- 17.7k
1
vote
0
answers
79
views
3
votes
1
answer
253
views
Test whether an expression contains a particular pattern
How to test whether an expression contains a particular pattern ?
I made a function for myself that tests whether an expression contains Plus or not.
...
- 4,405
10
votes
3
answers
894
views
What is the best method to search pattern for 2D list?
What is the best method to search patterns for 2D list ?
Let L be following 2D-list :
...
- 4,405
4
votes
1
answer
104
views
Replacement, PatternTest, Module related Question
Let's see how MMA handles following type of expression :
Replace[L, {pattTest1->rhs1, pattTest2->rhs2, pattTest3->rhs3}, {1}]
Specific example :
...
- 4,405
1
vote
1
answer
116
views
How to make a vector of elements the pattern of a function?
if I have an expression that contains a lot of symbolic elements and I would want to make it a function of the vector containing all the elements I've found a solution based on rule delayed:
...
- 129
1
vote
0
answers
262
views
How to make a function ignore an argument [closed]
Motivation
I am trying to call a function f, that has either 1 or 2 (or multiple) parameters, from a function g that uses ...
2
votes
1
answer
131
views
Why does this DeleteCases not work? [duplicate]
I believe this is simple but I couldn't figure out why this doesn't work.
Everything looks good to me.
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- 2,111
2
votes
2
answers
87
views
Construct a function like Coefficient
I'am trying to construct a function that will work like Coefficient as an exercise.
...
- 1,293
3
votes
1
answer
184
views
Apply functions to a BlankNullSequence
I'd need to apply all functions in a list to a BlankNullSequence (___)
But when I tried
...
- 712
7
votes
2
answers
2k
views
Skew-symmetric function
I have a simple question:
1) I defined a skew symmetric function this way
M[i_,j_]/;i>j:=-M[j,i];
M[i_,i_]:=0;
this is of course the most general skew ...
- 899
4
votes
1
answer
446
views
The basic primitive recursive functions
How can the basic primitive recursive functions be expressed in the Wolfram Language?
Apparently here's an example for primitive recursion:
...
- 341
21
votes
1
answer
487
views
What is the difference between defining a function and specifying the type of argument, versus applying a test to that argument?
Say I want to create a function that evaluates differently based on what type of argument is given. I've found two ways of doing this,
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- 71.2k
6
votes
1
answer
161
views
Is there an elegant way of delaying evaluation of `A==B` when calling a function that uses this pattern
Suppose I wanted to define a number of functions that accepts expressions of the form:
...
- 163
5
votes
1
answer
211
views
Downvalues vs. Scoping for Functions
Regarding my recent question on using a default value for a function argument when a pattern was not met yielded some interesting answers, but the general consensus was "Yes this can be done, but ...
- 11k