37 questions linked to/from How to avoid nested With[]?
147k views

### Where can I find examples of good Mathematica programming practice?

I consider myself a pretty good Mathematica programmer, but I'm always looking out for ways to either improve my way of doing things in Mathematica, or to see if there's something nifty that I haven't ...
4k views

### How to create symbols from strings and set values for them?

I am trying to convert a list of string names into symbols, which will then be used to store data. I have 24 files (where the name of each file is a member of the list mentioned above) that I need to ...
2k views

### How to match a pattern with a pattern?

UPDATED This question is about: "What is the pattern to match a pattern-definition, exactly as it is written?" My original question is now split according to Mr.Wizards insightful answer below. This ...
248 views

### Put local variables for Block in a variable

Is is possible to assign {x = 2, y = 3, z = 4} to a variable var so that one can write ...
9k views

### Metaprogramming in Mathematica

Being functional, and having no "quotation", i.e. essentially treating data and programs semantically same, Mathematica seems naturally capable of doing metaprogramming. But could anyone construct a ...
925 views

### Generating assignments and transforming code inside held forms when generating code

I have been playing with slightly above trivial code manipulations in Mathematica. I thought Mathematica would be great for this kind of work because of rule replacement and expression manipulation, ...
679 views

### Should I always be using Module in functions unless I explicitly want global variables?

I define functions a ton. In the past, I've mostly just defined my functions like: myFunc[var1_]:=( var2=var1^2; Return@var2; ) And I haven't run into too ...
544 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 ...
2k views

### Why can't I change the value of MaxRecursion in NIntegrate when integrating BesselJ?

Bug introduced in 8.0.4 or earlier and persisting through 11.0.1 or later I am trying to evaluate this integral numerically $$\int_0^{\infty } J_0(q R) \tanh(q) \, \mathrm{d}q$$ for large values ...
442 views

### Defining a sequence slot programmatically

This question is related to: Composition of functions using slots Slot (#) interfering with evaluation Consider a toy example: ...
407 views

### Comparing LetL and Module efficiency

I was recently introduced to the LetL macro thanks to Leonid's answer to one of my prior questions. I was, needless to say, impressed by the simplicity of its ...
76 views

### Scoping construct for dependent constants

I sometimes want to write a function which needs to apply a bunch of transformations that are not functions of a single parameter only: ...
141 views

### make a slider for a list of matrices

I have a list of matrices, called $matList$, which are sequentially multiplied by another matrix $G$. I created a slider for $matList$, but the slider does not work. Here is the ...
321 views

### Local variables whose definitions depend on each other [duplicate]

Consider the following (pseudo-)function definition: f[l_] := Let[{ a = Length[l], b = First[l], c = b/a, }, c*10] So for ...
138 views

### Getting past "infinite expression 1/0 encountered"

The following function ...
7k views

### File-backed lists/variables for handling large data

Background Currently I am working with some large data (most of it generated by Mathematica itself). I usually find it a hassle to do this. For example, I just exported a large amount of data to ...
327 views

### SyntaxInformation cannot reproduce syntax coloring of Block

Is there any way to have the same syntax coloring with SyntaxInformation that Block has? ...
984 views

### A debug utility to print or extract intermediate data from a program

Is there a way to print variables using their names, or to extract the corresponding information for later analysis ?
460 views

### Bug with iterated With: Referring to function arguments invalidates previous definitions

Thank you for your report. I have forwarded your report to the appropriate team for review. - WRI ...
581 views

### Removing calls to MainEvalute when using inlined compiled closures

This question is tightly related to the answer Shaving the last 50 ms off NMinimize. There @OleksandR shows how inlined closures can be used to eliminate calls to ...
220 views

### Proper Syntax highlighting for multi-argument With?

For the case of Block and Module one can choose to define values in the body for the variable names being scoped. So there is no ...
472 views

### A smarter nested With?

I often find myself writing code that looks a bit like this: ...
113 views

### Local variables in sums and tables - best practices?

Stumbled on Local variables when defining function in Mathematica in math.SE and decided to ask it here. Apologies if it is a duplicate - the only really relevant question with a detailed answer I ...
234 views

### Replace nested external definitions in Compile

f = #^2 &; Compile[{{x, _Real, 1}}, f /@ x, CompilationOptions -> {"InlineExternalDefinitions" -> True}] // CompilePrint works fine. ...
164 views

### Where can I put my conditions?

I just learned in this answer that you can put conditions inside a With and thus use computed values in them, like this: ...
725 views

### Functional programming Style & Performance

Hello i have been spending time to convert my R tools into Mathematica Packages mainly because i like the functional programming style in Mathematica. In doing so it seems that i run into one ...
361 views

### Is there any way to implement a "sequential" With[] in Mathematica? [duplicate]

I want the equivalent of Scheme's let*, or basically, a sequential With that works like this: ...
502 views

### Permuting indices to form fully symmetric tensor with repeated indices

I have written a function (version 8) that takes as an input a list of indices such as {i,j,k} and outputs a fully symmetric tensor function containing $p_i$ and \$...
66 views

### LetL Breaks in ParallelEvaluate

This was a wild head-scratcher for me to hunt down, but I now am sure LetL is the culprit. Here's a small example: ...
101 views

### Block assignments not quite sequential?

With scalars, Block acts like Scheme's let*, that is, the assignments (appear to) happen sequentially: ...
282 views

### Reuse local variable in declaration within With [duplicate]

Considering the richness of Mathematica.SE, I am quite surprised I could not find my answer... I am very sorry if it is a duplicate. Consider the following example: ...
67 views

### Weird behaviour of If inside of Block definitions?

I am on Mathematica 9 and I have discovered, that, when I use If inside of the definitions of the Block variables, then other, ...
58 views

### Variables referring to other variables within Module

The following doesn't work: Lol[x_, y_] = Module[ {w=x+1, z = w + 1}, z] because z refers to ...
326 views

### Best approach for 'manual' common subexpression elimination

I have working code, but am looking for ways to make it more elegant. I have a fairly large expression with plenty of repetition and structure. A shortened toy example is ...
50 views

### Dependent variables in With operator [duplicate]

I want write something like this With[{x=1, y=x+1}, y] and get 2 as an answer. What is the correct way to do this?