Questions about debugging techniques, using the built-in debugger, and/or the Wolfram Workbench debugger.

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2
votes
1answer
100 views

See Local Variable at breakpoint within MODULE?

Within the debugger, can we watch local variables within a Module? As the screenshot shows, the ā€œiā€ only display its global value (12) upon a message breakpoint. Is there a way to show its local ...
5
votes
1answer
295 views

What is missing in this Mathematica Journal Article?

So I had been looking to solve a little tiling problem and Google turned up this Mathematica Journal Article and I noticed the code was both incomplete and incorrect, so... My Question is, What is ...
4
votes
0answers
104 views

Syntax error for optional pattern, but only in debugger

This expression (explained here by Leonid) evaluates fine unless Evaluation->Debugger is enabled: h[x : (_Integer) : 1] := x Syntax::sntxf: "x:" cannot be ...
0
votes
0answers
50 views

What are ways to debug while Mathematica is running? [duplicate]

I would like to know if we can "watch some values" during running time of Mathematica. I remember that C and Pascal compiler ...
9
votes
0answers
83 views

How to capture implicit fails in Plot or Show? [duplicate]

How can I make a construct similar to C++ functions: try{} catch{} I want to use it to avoid showing a lot of errors in the plot area when for example one of the ...
10
votes
1answer
136 views

Is there a way to find out who is importing a package?

After calling some functions, if I look into $ContextPath, I can see that JLink` is in there. Is there a way to find out what ...
1
vote
3answers
156 views

How to debug error triggered by replacement rule?

The second line below produces the errors shown: ...
5
votes
1answer
81 views

How can I execute a sequence of statements interactively?

I'm fairly new to Mathematica. Suppose I have the following function: f[x_Integer] := Module[{y, z, r}, y = 5; z = 10; r = x + y + z; r ]; and I ...
10
votes
1answer
282 views

Debugging with Breakpoints

re: Version 9. I typically write concise code and make a real effort to refactor. As such debugging has tended to take care of itself. Recently, I've needed to assemble applications of more ...
-2
votes
2answers
166 views

Mathematica not assigning variable correctly

So I have been fiddling with this the last hour and I just can't get it to work. I have 3 matrices of the same size which contain nothing but 0's in a list, I also have 3 matrices of the same size ...
16
votes
1answer
270 views

How does the built-in debugger decide what to highlight?

How does the built-in debugger decide which definition to highlight in the notebook when Break on messages" is enabled? Here's an example to illustrate what I mean. First, enable the debugger ...
5
votes
1answer
176 views

How to find the name of the current function

I would like to know the name of the current function from within that function. For example, consider the following code ...
5
votes
1answer
106 views

how to print stack trace when TimeConstrained times out

According to the documentation, TimeConstrained generates an interrupt which interrupts the computation. This interrupt is treated just like an abort, at least in ...
3
votes
1answer
67 views

local logfiles for remote kernels

I'd like remote slave kernels to produce log files on my local machine, subject to the following constraints: 1) I don't want to install a distributed filesystem or do other administrative work on ...
20
votes
1answer
187 views

Why Trace[] shows some internal warnings on a standard Plot command in V9?

For fun, I like to use Trace with option TraceInternal->True to see if I figure how some of the commands work internally. I ...
5
votes
1answer
340 views

How to Debug Missing[NotAvailable] error for Social Media Data

I get a Missing[NotAvailable] error message when trying to access Social Media Data using SocialMediaData["Facebook", "Friends"] ...
13
votes
1answer
483 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 ?
3
votes
0answers
103 views

Dealing with errors and resuming the code after one

How can I write my Mathematica code so that it resumes at a specific place if any Message is displayed during the execution of an expression? For example, in Visual ...
4
votes
1answer
433 views

Catching and debugging numerical errors in compiled functions

I have a compiled function (that was created using the second method of this question). Basically it's using a compiled closure. The problem is that for some parameter values it does not evaluate. ...
3
votes
1answer
211 views

Debugging graphics

All the examples I am seeing on internet are related to normal functions that carry out loops and assignments but I have not seen one example where I can see a graphics based program being debugged. ...
2
votes
1answer
2k 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 ...
5
votes
3answers
143 views

Metaquestion: how to find out why (e.g.) MatchQ[42, _?Function[x, True]] is False?

Suppose you run into a bewildering Mathematica result (which happens to me several times per Mathematica session, even after a 20-year acquaintance), such as, for example: ...
0
votes
1answer
311 views

(N)Solve does not solve equation

I am trying to calculate where a beam hits a mirror. The mirror is described by this curve (two facing spherical mirrors): ...
4
votes
1answer
170 views

Help with Permutations

I am currently trying to generate a list of permutations of length 2 of elements of a list of strings. For example: ...
2
votes
2answers
359 views

Unexpected result of summation

I wrote small module that gives me incorrect output-set, it should be a single number! I don't understand what went wrong. This is the form of summation used: $$\frac{1}{2} (b-a) \sum_{i=1}^n ...
13
votes
0answers
339 views

How can I trace a functional expression's evaluation visually?

Ok, so the goal is to visualize the execution of this expression foo /@ {3 + 1, bar /@ {1 + 2, {4 + 7}}} in the following fashion using nested rectangles with ...
5
votes
3answers
723 views

Solution for equation system with piece-wise defined functions

As I could swear this worked just yesterday, I am probably just doing something stupid here and I am sorry to bother you :) I am trying to find the point where a curve crosses a line. In this case, ...
20
votes
2answers
1k views

Debugging memory leaks

I've written my incredibly complex, incredibly elegant analysis function, that works great on small test data. But when I run it on my real (bigger) data set it keeps running out of memory. It turns ...
5
votes
1answer
110 views

MUnit test debug breakpoints in Workbench not working

When I create a breakpoint in Workbench 2 for an MUnit test, and run a debug build, the breakpoints are not breaking execution. The MUnit output is updated like a normal run without breakpoints. Why ...
16
votes
5answers
2k views

Wolfram Workbench - Mathematica Development Alternatives

Are there any alternatives (IDE or other workflow) to Wolfram Workbench for development and debugging? Elaboration: An open source alternative.
7
votes
1answer
68 views

How can I get TracePrint to treat certain functions as atomic?

Consider the following example: ...
18
votes
2answers
610 views

Is it possible to Print expressions in reverse order?

Let's say I'm debugging a program step by step and want to Print some expressions (using ShowIt, for example). Is there a way to output the result of ...
15
votes
2answers
1k views

Debugging Mathematica Code

In various integrated development environments, such as Microsoft Visual Studio, there is an integrated debugger where you can step through code sections, examine the state of variables and figure out ...
36
votes
2answers
1k views

Mathematica Debuggability

One of the things that I really dislike about Mathematica is its lack of debuggability compared to many other programming languages. Some of the problems arises from the functional nature of ...
10
votes
1answer
154 views

Inspecting non-variable state from a breakpoint in Workbench

Suppose I'm stopped at a breakpoint in Workbench, say at one of the y = ... lines in: ...
24
votes
1answer
364 views

which is better, using Assert[] or manual checks on arguments and other computations?

I never used Asserts in Mathematica, but trying to see what advantage they have over just argument check and additional definitions of the function to capture unwanted input. For example, which one ...