Questions tagged [placeholder]
The placeholder tag has no usage guidance.
11 questions
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1
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Recursive error encountered when updating rules of assignment [closed]
I'm working on a problem which requires associating a single (complex) number with a pair of binary vectors. I'm doing this by creating a set of assignments through a function I call ...
- 667
0
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1
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266
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How to implement integration by parts?
I have been trying to simplify integrand expressions using integration by parts, which schematically is given by $\theta(x)\nabla\phi(x)=-\phi(x)\nabla\theta(x)$. I think this can be done as a ...
3
votes
1
answer
55
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How to make boxes independent from those cell-formatting options?
In a cell whose LanguageCategory option is "Input", boxes will be syntax-highlighted. Is there any way to diasble such ...
- 573
1
vote
1
answer
129
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Using # and ## in same statement to represent different levels
I am trying to write some codes to judge if each row of a matrix contains any negative numbers. For example mat = {{1, 2, 3}, {-1, 2, 3}, {0, 2, 3}}, and ...
- 1,327
1
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1
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43
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Notebook Apply with SelectionPlaceholder leaves entire pasted structure selected
Consider the following button:
...
- 2,307
3
votes
1
answer
697
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Replace rule using a wildcard
I have a complicated expression which I want to simplify following a rule. For example, if I want to make the following replacement:
A[t] - B*A[t - d1] = Y[t]
...
- 33
0
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0
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288
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How to use multiple placeholders to define a function that operates on special functions.
I am trying to understand if and how I can use multiple placeholders in order to define a function that will perform more than one operations on special functions; more accurately, sums, products, etc ...
user49048
5
votes
2
answers
138
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MatchQ failing in some cases with Hold [duplicate]
Could someone clarify why the first of these MatchQ finds a match whereas the second does not? (I'm using version 10.0, in case that matters.)
...
- 1,989
1
vote
2
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43
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Place Holder or Suppressing Re-ordering
Using the for loop how can I print:
file0.jpg
file1.jpg
file2.jpg
file3.jpg
file4.jpg
file5.jpg
file6.jpg
file7.jpg
file8.jpg
file9.jpg
The closest code I came ...
- 11
3
votes
1
answer
103
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How to use special characters in .m file?
I ran into a strange problem with a function that I want to include in a package file (.m):
Cleanup[data_] := data /. (\[Placeholder] -> Missing[])
When I ...
- 599
0
votes
1
answer
142
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What is the simplest way to obtain function obect of a given function?
Suppose I have a function p of some arguments:
p[x_,y_]:= (* something *)
Now I with to pass this function as an object to ...
- 2,043