Questions tagged [argument-patterns]

Questions concerning argument patterns used as formal arguments in function definitions (e.g., := expressions) to restrict the kinds of values that can be passed as actual arguments. Also questions about how such patterns can be used to achieve function overloading.

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About the OptionsPattern[] approach of inheriting Options

Szabolcs showed in this post, that there are possibly two approaches to inherit function options. He recommended the Join approach. At first, I agreed. But today I ...
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Syntax error for optional pattern, but only in debugger

This expression (explained here by Leonid) evaluates fine unless Evaluation->Debugger is enabled: h[x : (_Integer) : 1] := x Syntax::sntxf: "x:" cannot be ...
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How to get f[x] to match with f[c_., x] when OneIdentity doesn't match

After setting: SetAttributes[f, OneIdentity] Default[f] = 1; We have the following successful matches: ...
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81 views

Is there something like a function pattern test?

Is there something like a function pattern test? function[x_?FunctionQ]:=Module[{},] In order that Mathematica can tell if the argument is a function or a ...
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Automating generation of argument error messages

You can run into messages like DistributionFitTest["kk", "TestConclusion"] ...
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61 views

How conflicting patterns are resolved?

I often find myself doing something like this (probably poor example, sorry) f[x_] := 0 f[x_Plus] := 1 In the back of my mind generally ...
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31 views

Is there a way to get the calling information inside the body of a function defined using down value?

Suppose a function has multiple argument structure like follows: ...
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83 views

Using Two Arguments on the Same Function

I'm having some trouble wrapping my head around how I would go about using two arguments in one function. In the first section of the code below, I have scraped some "tweets" on the Seeking Alpha ...
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56 views

Is there any point to using a variable as a function parameter?

Normally one only sees patterns as function parameters: fun1[x_]:=x^2 Is there any point to using a variable in a function definition: ...
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32 views

passing splice instructions

Consider some passing splice instructions using start,stop,step pattern ...
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44 views

Head of complex sum

We have: 1 + 2 I + 3 + 4 I // Head Complex and 1 + 2 I + 3/5 + 4/5 I // Head Complex But we get: ...
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50 views

Delayed Rule right-hand-side mis-evaluation

Outline I am trying to create a rule that will give me a minus sign if the number of times A is applied on X is odd where A is some οperator and X a random quantity. Some of the configurations of ...
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55 views

Functions definitions with variable arguments

How do you define a variable amount of functions with a variable amount of arguments? I don't get the reference at all : ...
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38 views

Defining functions with pattern as argument

I want to define a function such that f[18/17 h[y][z]] = 18/17 z for any function h[y][z]. I first tried with ...