Linked Questions

67
votes
10answers
3k views

Injecting a sequence of expressions into a held expression

Consider the following toy example: Hold[{1, 2, x}] /. x -> Sequence[3, 4] It will give Hold[{1, 2, Sequence[3, 4]}] ...
59
votes
4answers
4k views

How do I evaluate only one step of an expression?

I am looking for a simple, robust way to evaluate an expression only one step, and return the result in a held form. The definition of a single step is ambiguous, and this itself is probably worthy ...
23
votes
4answers
728 views

SetOptions locally?

Is there a way to SetOptions locally? For example, I have a Module and inside it I am doing a lot of ...
31
votes
3answers
2k views

Consistent Plot Styles across multiple MMA files and data sets

I am starting to write a thesis for which I want to use MMA for all my plotting needs, mostly because a lot of the basic analysis has been done there. To ensure that I am applying styles consistently (...
21
votes
4answers
932 views

How can I work out which functions work with SetOptions?

Not all functions seem to work with SetOptions. e.g. ...
19
votes
2answers
464 views

Clean and handy Options management/filtering

the case I want to be able to create a function with some default options but also without need to add full explicit list of options available for it. And then inside I want to be able to filter ...
8
votes
5answers
503 views

How to Map a function with HoldAll attribute

First of all, I'm not sure about the title of this question, so please correct me if there is any title more sensible than mine. The problem is the following: I have a function f that checks if a ...
4
votes
3answers
357 views

Extracting unknown ColorFunction from Plot, Plot3D etc

I wonder if there is a way to extract existing ColorFunction and "override" it with a new function that will depend on original one. This question discusses ...
4
votes
2answers
241 views

How to achieve Set+Part like behaviour in custom Set function?

So I've been toiling away on my DataFrame package. I've been trying to get Set to work with it, but it seems it either can't be done (ie via ...
4
votes
2answers
245 views

why set values in this way doesn't work?

question is as follows define a list ttt={1,2}; and if I set values in this way {ttt[[1]],ttt[[2]]}={3,4} then the value ...
7
votes
1answer
149 views

Way to add a same option to multiple functions

Just wanna figure out if there is a decent way to add a same option to multiple functions simultaneously. For example I have a series of SoundNote: ...
1
vote
3answers
143 views

MapThread (or alternative) for adding fixed option

I currently use MapThread[f, {{a1, a2}, {b1, b2}] for obtaining { f[a1, b1], f[a2, b2] }. Is there a version (or alternative) ...
7
votes
1answer
282 views

Creating a Block from a list of rules

How can I create a function which works like Block but takes a list of rules as its first argument, rather than a list of assignments? The function needs to be ...
2
votes
2answers
218 views

Pattern matching to head with HoldFirst

I want to define a function that only operates on expressions with a head from a given list, such as f[expr:(_And|_Or)] := Print["LHS is ", expr[[1]]]; This of ...
0
votes
2answers
383 views

Edit plot after creation [duplicate]

I try to find a way to manipulate a plot I created before. (for full code take the fuction x[t_]:=Sin[2t] ) Let's say I have a plot: ...

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