Questions tagged [error-tracking]

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58
votes
2answers
3k 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 ...
32
votes
2answers
912 views

How do I disable the stack tracing feature in Mathematica 11?

Bug was introduced in 11.0 and persisting through 11.1 It looks like the Mathematica 11 stack tracing feature (see red ellipsis in front of any warning message) prevents the garbage collector from ...
22
votes
5answers
1k views

How to catch complete error message information, including the message text as it would be printed?

If I evaluate this expression: Module[{}, 1/0;0^0]; msg = $MessageList I get: ...
21
votes
1answer
252 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 ...
18
votes
2answers
531 views

MathKernel doesn't return all Messages

In Mathematica I run this command: Plot[Sin[x], {x, 1, 15}, GridLines -> error] It generates a Plot with this error message: A GridLines specification ...
18
votes
2answers
220 views

Would it be a good idea to use Failure and FailureQ in own code

Since version 10 (at least 10.0.2 but I think 10.0.0) there is Failure and since version 10.2 there is also FailureQ. As often ...
12
votes
1answer
200 views

Adding Trace produces error messages

This is very strange. As I was trying to debug this problem, I noticed when I add Trace then I get lots of internal errors generated. This also happens the first ...
10
votes
3answers
443 views

How to write a function-defining function which stores the function arguments in a stack?

I have a function-defining function SetAttributes[DefFn, HoldAll]; DefFn[f_[args___], body_] := f[args] := body; I am trying to modify this function to record ...
10
votes
2answers
219 views

What is the simplest way to determine which call to a superfunction has generated a Message?

I have a complicated function which contains many calls to NIntegrate, NSolve, FindRoot and ...
9
votes
1answer
271 views

Unit tests for Graphics or FE boxes

Consider the following expression with bad syntax: Graphics[{foo}] How can I detect the error and retrieve the error message programmatically, so I can check for ...
8
votes
2answers
1k views

Histogram with Error bars

I have a dataset for which Mathematica easily creates a Histogram. However I also need Mathematica to show error bars corresponding to 3 standard deviations for ...
5
votes
1answer
121 views

Strange Tilt on error notification

I was testing the source code of the answers to this question. And when I tried this response and maxed out most of the manipulators, this is what I got. What went wrong that the errors are tilted. ...
5
votes
2answers
625 views

Solution of a System of Equations Using `Solve`

Part 1 I am trying to solve a simple system of equations as follows Solve[{A x^B == f, A y^B == g}, {A, B}] But I just get the error Solve::nsmet: This ...
5
votes
1answer
118 views

Raise Warning/Error on invalid Matrix Addition and Multiplication

Consider the following code: DiagonalMatrix[{1, 1, 1}] - 1 Mathematica interprets it in the way, that it substracts 1 from every matrix field while ...
5
votes
2answers
297 views

Automatically detect largest interval over which NDSolve can find a solution

Question: Consider the following numerical resolution: NDSolve[eqn, {x1[t], x2[t], y[t]}, {t, tmin, tmax} where eqn, ...
5
votes
1answer
210 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 ...
5
votes
1answer
74 views

Ignore message in `Check` without silencing

Check[expr,failexpr,checkedMessages] will evaluate expr and if it encounters any of the messages in ...
4
votes
5answers
164 views

How to get a list of indices at which errors occur during iteration

I have been looking at some of the questions regarding error handling but i think my problem is unique. I am running a Do-loop. I get errors only for certain values of the loop variable due to the ...
4
votes
2answers
143 views

Why do I get number with Precision larger than error estimate?

I'm trying to integrate a large function like this ...
4
votes
1answer
197 views

How to disable roundoff error tracking in arbitrary precision arithmetic?

In my calculations I need some larger precision. But due to the fact that I iteratively refine the results to compensate for rounding errors accumulated in previous iteration, Mathematica's arbitraty ...
4
votes
1answer
229 views

Goal optimization: finding the best combination of capacitors and resistors resulting in given properties

I want to edit @MarcoB answers (because the code he gave doesn't answer the question appropriately)->(the function that need to be optimised is not implemented as asked) But it seems like I am having ...
4
votes
1answer
1k views

Why these (error) messages?

Testing this answer I used: stream = OpenWrite["A:\\out.txt"]; Block[{$Messages = stream}, Mod[1, 2, 3, 4, 5] ] and I was surprised to find that the contents ...
4
votes
1answer
92 views

Show error messages from collapsed sections

I've got a fairly long notebook. I like to have most of the sections collapsed. If I evaluate the entire notebook I don't see errors in the collapsed sections unless I expand them. I did see that I ...
4
votes
0answers
201 views

Adding an attribute crashes the system?

At some point I noticed the following errors just in the documentation: And not only this one, this is not only for Manipulate, there were many others. Also the ...
4
votes
0answers
198 views

How can you link Parallel Mapping and Error tracking

Following this question and the comments made, together with the information in this question, the following code allows error tracking and debugging very nicely. ...
3
votes
1answer
13k views

How do I troubleshoot when I get a Part::partd or a Part::partw error?

Mathematica has produced the following error message: Part::partd: Part specification ... is longer than depth of object? What is partd? I think I may have ...
3
votes
1answer
68 views

Saving a log file if an error occurs

I am running a program that adds a message to a list after each completed cycle (about 5k cycles). Upon completion, the program saves the list to disk so I can review it. However, if the program ...
3
votes
2answers
106 views

How to track accumulated error?

If Im not wrong when we use the command N we are using float point numbers in machine precision, right? And the machine precision depends on the bits of the CPU ...
3
votes
1answer
494 views

How to plot a function whose constant parameters have associated uncertainties in Mathematica 8.0?

Let's assume I want to plot the function $f(x)=a + bx+ cx^{2}$, where experimentally known values of parameters $a, b$ and, $c$ are as follows: $a=1.01 \pm 0.18$ $b=0.92 \pm 0.11$ $c=2.2 \pm 0.2$ ...
3
votes
1answer
320 views

Printing a success message if no errors have yet been thrown in the current session

I plan to run a lengthy Mathematica script on a Linux terminal (by "a Linux terminal," I mean that I have text output only -- no GUI), using the program math. To ...
3
votes
2answers
3k views

SystemException[“MemoryAllocationFailure”, …] with NMaximize

I have a complicated analytical expression that needs to be maximized with respect to a parameter t: ...
3
votes
1answer
97 views

Large residual error when solving a 2D BVP with NDSolve and Finite Element Method

I'm trying to solve a simple PDE (an inhomogeneous Helmholtz equation) in a disk domain with center at $(1,0)$ and radius 0.5 using the following commands ...
2
votes
2answers
375 views

DSolve running forever

I have no idea how to speed this up. Does maple do a better job at solving this?
2
votes
1answer
35 views

How can I properly use Catch[] to prevent my program from quitting?

I am getting an error depicting an Uncaught Throw, with the accompanying code being returned: Hold[Throw[$Failed, CURLLink`Utilities`Exception]] I have managed ...
2
votes
1answer
79 views

Plotting function containing NIntegrate: trace the values of convergence problems

Suppose you are plotting a function Plot[f[x],{x,0,10}] Where f[x]=NIntegrate[g[x,t],{t,Tmin,Tmax}]. and when plotting, ...
2
votes
1answer
209 views

Mathlink works strangely

I have problem when using mathlink, the source code is quite simple: ...
2
votes
0answers
54 views

Issues with symbolic integration

I am trying to do the following indefinite integral, ...
2
votes
0answers
83 views

How to find discretezation error of NDSolve

Is there a way to find out how large the truncation, round-off, and other errors that occur from discretizing a differential equation are while using the default settings in NDSolve? Or would I have ...
2
votes
0answers
85 views

Finding and interpreting errors [duplicate]

This sounds like a fairly trivial question, but I can't think of any way to solve it. I am doing an extensive parameter sampling where a set of ODEs is used together with ...
1
vote
2answers
133 views

How to output (anything) if any error happens

I have long code which goes through iteration process. some times I get error messages. I want to get the iteration numbers (or any kind of output indications) when errors happen. for example, how ...
1
vote
2answers
119 views

Avoiding a for loop to create a list

I am trying to evaluate: ...
1
vote
1answer
44 views

Why does Mathematica just return Hold of my Input? [closed]

Example: Solve[x^2 + a x + 1 == 0, x] Output: Hold[Solve[x^2 + a x + 1 == 0, x]] What is the problem? Any child can solve this in its head
1
vote
1answer
62 views

Error in the exercise or in mathematica settings

I am going through Kenneth Rosen's book about discrete mathematics. Chapter 1 there is a example where we build functions to check valid conclusions. Here is the code: ...
1
vote
1answer
143 views

How to count the actual occurence of a warning message in a Do loop?

I am running a lot of simulations to fit a model to randomly generated data. Sometimes the fitting converges properly sometimes it does not, but it will give you the fitting parameters anyway. I would ...
1
vote
1answer
51 views

How to catch error messages from parallel kernels

Doing something that throws out an error (warning): ParallelTable[NIntegrate[1/Sin[10 t], {t, 0, W}], {W, 0, 10, 1}] In parallel somehow limits a possiblity to ...
1
vote
1answer
58 views

Catching errors while mapping a solver over a list of parameters

Perhaps this question has a simple answer, I'm sorry but I unable to get my head around it. Here's a minimal description of my issue. I have a an equation of the form ...
1
vote
1answer
111 views

What is the best practice way to handle arithmetic exception in Mathematica

What is/are common way/s to handle what would be ArithmeticExceptions in Java in Mathematica/ Wolfram Language? The ugly code is the If...Continues in the innermost For Loop. How should I address this ...
1
vote
0answers
43 views

raise error on type mismatch

Is there a best practice for raising an error on a type mismatch? For compiled functions I'm guessing the answer is the use of GeneralUtilities`WithMessageHandler. ...
1
vote
0answers
19 views

How to get a value from Error message? [duplicate]

I've looked pretty hard for a solution to this issue with no luck. Hope you could give me a clue: When I run NDSolve I get the following error msg: ...
1
vote
0answers
188 views

Kernel shutting down automatically with no error

What are the possible reasons why a kernel exits and the computation simply stops without printing out an error message? In case the specific scenario is required, it is as follows but perhaps the ...