Questions tagged [optional-arguments]
Tag for questions about using optional arguments in Mathematica functions.
107
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33
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Separate definition of custom options and passed options in function definition
Why do these codes do not work?
...
- 9,653
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0
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43
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How to pass on optional arguments, but with different default values?
Main question
I want to define a function g that calls a function f. g has optional ...
4
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1
answer
67
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How to specify the type/Head of the optional named arguments to a function?
I am trying to improve my own dsolver API. Currently it takes optional arguments.
Is it possible to specify that an optional argument should say be String only? Or List Only? Or Integer only? and so ...
- 137k
4
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1
answer
94
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OptionValue not inserting correct option
I am using OptionsPattern and OptionValue to define some switches for my custom function. Here is a minimal example:
...
- 557
1
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1
answer
84
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Ensure that Options for built-in symbols are the original defaults
I often create symbols (no args) or functions (with args) in which common options (and styles) are set in body and unique opts within args for managing multiple calls to built-in functions. these spit ...
- 2,397
2
votes
1
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83
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Propper way of getting rid of FilterRules statements when passing options?
When passing options from a function f to a function g in the body of f one can use the <...
- 1,470
1
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1
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127
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Condition (/;) not working correctly on a function with optional arguments and options
I have read this post: How to avoid collision between optional arguments and options, and use Mr.Wizard's method to solve this problem. But when I add conditions to optional arguments, it seems that ...
- 316
2
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1
answer
73
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Force only selected optional arguments
Is there a way to force only selected values for function argument?
For example for this function:
g[x_, y_, a_: ("b" || "c")] := Print[x, y, a]
...
- 51
1
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0
answers
78
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Skip middle optional arguments
Is there a way to skip some middle optional arguments?
For example for this function:
...
- 51
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0
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73
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How to have Mathematica showing a dropdown list after entering an option and the -> in a function argument [duplicate]
When I enter
Plot[Sin[x], {x, 0, 2 Pi}]
Mathematica returns, as expected, the expected Sinus wave of one period.
Plot has many, many options, when I enter:
...
- 9,637
8
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0
answers
73
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Why does Longest not work on OptionsPattern?
When having a function with optional arguments and options, I frequently find myself writing something like this:
...
- 33.4k
2
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0
answers
71
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How to produce an error message for each argument?
I want to print a helpful message for every wrong input. How do you compactly implement a function with custom pattern constraints, default values and error messages for each argument separately? For ...
- 5,423
0
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1
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83
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Why won't Sequence work when wrapping a list of arguments for deletion with Remove?
I wrote a quick and dirty little function freshStart which does a variety of things meant to give me a nearly fresh Kernel without having to ...
- 2,397
5
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1
answer
94
views
1
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1
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75
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How to manually create options that can be entered as a sequence or list?
I am trying to implement custom options in my code manually, rather than using the built-in Options tools. So I have functions that look like ...
- 854
2
votes
1
answer
101
views
Simplest way to check if optional parameter is omitted?
Suppose I have a function
f[x_,y___]:= (code)
and I want my code to check whether the parameter y is omitted. What's the easiest ...
- 854
1
vote
1
answer
43
views
How to create custom NIntegrate with special option behavior?
I'm trying to create a custom version of NIntegrate, called MyNIntegrate, with custom option behavior. In particular, I'd like ...
- 854
1
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0
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115
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How to change behavior of Echo or turn it off without removing it from code?
I wish to use Echo for output of intermediate results if an OptionValue I call ...
- 2,397
2
votes
2
answers
127
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Help understanding options on ContourPlot3D
I am creating some figures showing the intersection between two surfaces. I managed to get most of what I want with the following code:
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- 29
0
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1
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83
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passing splice instructions
Consider some passing splice instructions using start,stop,step pattern
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- 1,114
0
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1
answer
76
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Keep irrelevant variables outside function arguments
I want to define several functions of variables x,y say
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- 535
1
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1
answer
131
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Default Options not working in user-defined function for SymbolName
Abstract I have a function objectName[symbol] that returns the SymbolName as both a standalone function or when nested inside ...
- 2,397
3
votes
2
answers
85
views
Setting nested optional argument with a default when unpacking from a given Head
I have a head that holds a single argument, and I want to unpack the value inside it while also assigning a symbol to the value itself, for example:
...
- 257
1
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0
answers
68
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String arguments break optional argument default values? [duplicate]
Following a tip in this post, I use string parameters to label my functions. For example, instead of f[x]:=x^2, I use ...
- 854
9
votes
1
answer
139
views
Why Optional in Set is not held by the HoldFirst attribute?
When evaluatingf[x_:x0] := x, x0 will be evaluated, regardless of the HoldAll attribute of <...
- 732
2
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1
answer
94
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Issue using optional argument before options [duplicate]
I have a problem using optional arguments before an OptionsPattern:
...
- 31.2k
10
votes
2
answers
762
views
Define function that behaves almost identically to Mathematica function
Often I like to define my own functions that are almost exactly the same as Mathematica defined functions, apart from a few tweaks. See this question for example. I want to define them properly so ...
- 3,366
5
votes
1
answer
89
views
Why is { } interpreted as an option in my function? [closed]
I don't understand the output from:
...
- 1,116
0
votes
0
answers
60
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Optional argument in Set Function [duplicate]
Optional arguments can be defined in SetDelayed (:=) Functions (see f1 below and here and here). However, how can one accomplish this in Set (=) Functions (see f2 and f3 below)?
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- 1,585
2
votes
1
answer
96
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OptionValue and OptionPattern not Changing Values
I am trying to produce a function with a few sets of arguments, one of which can accept options. However it doesn't seem to be responding to the changes that I accept.
...
user47636
0
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0
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56
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Method option of function MatrixRank
By running ??MatrixRank, I see that it has an optional argument named Method.
However, this argument is not in the ...
- 221
7
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0
answers
244
views
OptionsPattern[] Vs. opt___ [closed]
Since version 6 I've been dutifully using OptionsPattern[] instead of the original opts___ for passing options to functions.
I ...
- 111
8
votes
2
answers
427
views
Are Mathematica commands always supposed to check that Method -> name is valid?
When calling a Mathematica command which accepts a Method -> name option, I always thought that if the name given is not a ...
- 137k
1
vote
1
answer
2k
views
Set absolute size of Axis or frame for a plot
I have to publish some work and it requires to meet specific criteria for the image size and plot size. 1) the Area of the figure must be fix 2) the width of the x-axis also must be fix for any plot ...
- 121
2
votes
0
answers
53
views
Scoping of OptionValue for inner functions in closures
Assume a function f is a closure over an inner function g. Both f and ...
- 8,399
4
votes
2
answers
115
views
How to prevent an Optional parameter from taking an OptionsPattern parameter without multiple function definitions? [duplicate]
I have function the needs to enable some Optional parameters and an OptionsPattern. The issue I am facing is that the options ...
- 41.7k
3
votes
1
answer
56
views
Using other functions' replacement rules
I have a module that uses some default options for NDSolve like so
...
- 569
1
vote
1
answer
48
views
Why doesn't OptionValue cooperate with Map? [duplicate]
Consider the following definition:
Options[f] = {a -> 1, b -> 2}
f[x_,OptionsPattern[]] := {x,OptionValue/@{a,b}}
I thought that doing something like ...
- 4,185
11
votes
1
answer
151
views
Except @ OptionsPattern[] affects OptionValue
The background
This example works as expected, small function with a special case rule:
...
Kuba♦
- 136k
-1
votes
3
answers
125
views
OptionsPattern Confusion
I want to use the whole options pattern as the argument for HTTPRequest's "Query" parameter, but I'm not sure how to use them. When I run the following code:
...
- 417
5
votes
1
answer
163
views
What is the difference between the second argument of ToString and its option FormatType?
Is there any real difference between ToString[expr, form] and ToString[expr, FormatType→form]?
In all my examples, they seem to ...
- 19.5k
1
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0
answers
67
views
What is the best way to pass on options? [duplicate]
Say I have two functions which take the same set of options, e.g.
Options[f1] = {a -> 1};
Options[f2] = {a -> 1};
Now, ...
- 2,953
4
votes
2
answers
158
views
How to define an option or an argument whose values are confined
I want to define a function whose arguments or options can only be selected in a range. For example:
...
- 73
5
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0
answers
59
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1
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0
answers
106
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Automatic is not always the default option
Contrary to what one might expect, specifying an option to be Automatic sometimes changes the output. For example, by default ...
- 1,766
10
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1
answer
1k
views
2
votes
2
answers
408
views
Anonymous Function And Optional Arguments [duplicate]
Is there a way to get an optional arguments to work in an anonymous function.
Function[{Optional@a},If[a,True,False]]
- 7,565
3
votes
2
answers
91
views
How to define a function with an optional value related to the arguments?
It's known that we can easily define a function with optional value which is not related with other arguments, but my question is how can I define a function with an optional value which is really ...
- 33
12
votes
4
answers
639
views
Optional argument that can be completely omitted?
I am writing a simple function return similar words.
Clear[similarWords]
similarWords[string_]:=Nearest[WordList[],string]
I want to add another argument ...
- 16.9k
6
votes
0
answers
112
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Examples of the single dot form of Optional?
I've known of the single dot form of Optional for a while, but never had occasion to actually use it:
Are there any good examples of use cases for it other than in relation to ...
- 31.2k