Linked Questions

111
votes
3answers
5k views

Programmatic formatting for Mathematica code - possible?

It seems to be both an interesting programming challenge and a very useful practical application to have a Mathematica program which would allow one to pretty-print Mathematica code, so that it is ...
37
votes
5answers
1k views

How to examine the structure of Graphics objects

One difficulty I'm encountering in studying the structure of Graphics objects is that I have not yet found a way to print or display such structures that are ...
26
votes
4answers
29k views

How do I identify the source of a “Tag times protected” error?

I have some code that looks like Table[ a = 1; b = {2, 3} c = i;, {i, 2} ] which gives an error: Set::write: Tag Times in c {2,3} is Protected....
19
votes
7answers
4k views

Finding the period of an array of integers

A simple array of integers is given. The problem is to detect if a pattern is repeatedly occurring in the array, and find the length of that pattern. For example, for ...
17
votes
2answers
390 views

Why Infinity /. _?(# < 6 &) -> 0 replaces Infinity with ComplexInfinity?

Suppose I define a matrix: mat = { {Infinity, 4, 9}, {6, Infinity, 10}, {8, 9, Infinity} }; Now I want to replace all values smaller than ...
17
votes
2answers
275 views

Serious regression in Integrate in 11.1.1? Division by zero generated

seen first in 11.1.1, Fixed in 11.2 What is going on here? In version 11.1.1 on windows 7 Using Version 11.0.1 also on windows 7 Source code ...
14
votes
2answers
2k views

How to find out where an error occurs?

I got this error when using Mathematica: ...
10
votes
1answer
142 views

Trace of -{1} expression

I'm trying to understand Trace. Usually it doesn't repeat but it adds {-1,-1} for his simple expression after having a correct ...
8
votes
3answers
154 views

Indexed and array-valued interpolations

Bug introduced in 10.1 or earlier and fixed in 10.4.0 Using Indexed on an InterpolatingFunction leads to an ...
8
votes
1answer
486 views

Visualizing nested lists for easier human understanding

When interacting with Mathematica, I often find myself staring blankly at waves of curly braces, trying to understand how data is organized hierarchically. For example, the beginning of the result to ...
7
votes
3answers
134 views

CompiledFunction showing its contents

CompiledFunctions usually appear very compactly, for instance: ...
7
votes
1answer
255 views

Why can't I pattern match Dt?

A simple question: MatchQ[f[a], f[x_]] (* True *) MatchQ[D[a], D[x_]] (* True *) MatchQ[Dt[a], Dt[x_]] (* False *) Why doesn't the last test succeed? Is this a ...
5
votes
2answers
174 views

Is there a way to accelerate buffering to the screen?

I have an application that does a bunch of small computations, mostly Table management, and logic around loops. It takes seconds to execute. However, when I turn on debug (a variable I set for ...
4
votes
2answers
147 views

TraceScan output with input/output in same order as TracePrint

I would like a version of TraceScan that gives me the ability to see what the trace pattern evaluated to, but prints output in the order that ...
3
votes
3answers
662 views

How does one unpack the contents of a list while using rules to substitute values for each variable?

My intention is having a large collection of variables (symbols to be more specific) in a list and substituting all the variables at once with a value using rule instead of going through each one, one ...

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