Questions tagged [optional-arguments]

Tag for questions about using optional arguments in Mathematica functions.

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2
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0answers
54 views

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 ...
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1answer
68 views

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 ...
5
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1answer
56 views

Type safety and scoping in OptionsPattern arguments

I am new to OptionsPattern. Consider ...
1
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1answer
50 views

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 ...
2
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1answer
43 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 ...
1
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1answer
39 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 ...
1
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0answers
52 views

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
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2answers
60 views

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: ...
0
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1answer
73 views

passing splice instructions

Consider some passing splice instructions using start,stop,step pattern ...
0
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1answer
54 views

Keep irrelevant variables outside function arguments

I want to define several functions of variables x,y say ...
0
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0answers
51 views

Parallelized FactorInteger

FactorInteger has no documented option to be parallelized. Can this be done by some clever hack? Or is there a ready-made substitute that makes use of multiple ...
1
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1answer
50 views

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 ...
3
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2answers
67 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: ...
1
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0answers
43 views

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 ...
9
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1answer
131 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 <...
2
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1answer
84 views

Issue using optional argument before options [duplicate]

I have a problem using optional arguments before an OptionsPattern: ...
10
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2answers
739 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 ...
5
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1answer
87 views

Why is { } interpreted as an option in my function? [closed]

I don't understand the output from: ...
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0answers
54 views

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)? ...
2
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1answer
56 views

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. ...
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0answers
38 views

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 ...
7
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0answers
155 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 ...
8
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2answers
412 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 ...
1
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1answer
998 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 ...
2
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0answers
40 views

Scoping of OptionValue for inner functions in closures

Assume a function f is a closure over an inner function g. Both f and ...
4
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2answers
98 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 ...
3
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1answer
52 views

Using other functions' replacement rules

I have a module that uses some default options for NDSolve like so ...
1
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1answer
41 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 ...
10
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1answer
116 views

Except @ OptionsPattern[] affects OptionValue

The background This example works as expected, small function with a special case rule: ...
-1
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3answers
106 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: ...
5
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1answer
159 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 ...
1
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0answers
52 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, ...
4
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2answers
144 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: ...
5
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0answers
55 views

Optional in MatchQ [duplicate]

Why isn't the first one True in: ...
1
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0answers
81 views

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 ...
9
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1answer
873 views

define a function with optional arguments

I have defined a function as follows: ...
2
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2answers
348 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]]
3
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2answers
70 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 ...
12
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4answers
623 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 ...
6
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0answers
105 views

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 ...
2
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0answers
106 views

How to create a function with option that shows dropdownlist like ( for example ) Manipulate with ControlPlacement? [duplicate]

Consider the Mathematica function Manipulate where you assign the placement of the controls with the option parameter ...
14
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1answer
238 views

Pattern matching with List and Optional

Bug introduced in 8.0.4 or earlier and persists through 11.1.1 Thank you for bringing this to our attention. I have filed a report with our developers. Why does this ...
2
votes
1answer
78 views

Is this the correct method for using optional arguments?

I've read this page but I'm still kind of confused about something. Here's a simple example function, where it simply plots a function. If you give it the ImageSize option, it should use that, but ...
8
votes
2answers
106 views

How to write a `HeldOptional` variant of `Optional` that does not evaluate its second argument?

How to specify optional arguments that take functional values made me wonder: Can we come up with a variant of Optional that allows to do the following: ...
8
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3answers
2k views

Functions with both optional arguments and options [duplicate]

I have the following codes: ...
6
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2answers
513 views

How to make a customized plot function that can plot functions with optional parameter?

Suppose I make the following function to plot contour lines for a complex function: ...
3
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1answer
91 views

How to speed up accidental large output?

From time to time I accidentally let large expressions like RandomReal[1., {10^5, 10, 10}] reach the front end. The computation of the result is quite fast (...
9
votes
1answer
283 views

Why is this syntax for patterns with Optional values not supported?

I want to express Optional[PatternTest[Pattern[a,Blank[]],t],1] concisely. a : _?t : 1 is not quite this but works: ...
0
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0answers
39 views

How to use OptionValue inside a pure function [duplicate]

I want to define a function with OptionsPattern as argument which returns a pure function using OptionValue: ...
1
vote
1answer
588 views

How to pass arguments in NIntegrate and NDSolve

I am solving PDEs with NDSolve and NIntegrate, but I do not know how to pass arguments correctly. My orignial code is very ...