Questions tagged [error-trapping]

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26
votes
1answer
4k views

Error checking and trapping techniques with Throw and Catch

Mathematica provides several mechanisms for checking arguments and trapping errors in a function definition. Typical methods are : Definitions with argument patterns, definitions with ...
13
votes
1answer
372 views

Check does not interrupt evaluation of the expression when a Message is emitted

On the surface, Check looks like a good method to use when you need to abort the evaluation of an expression whenever a Message ...
11
votes
2answers
412 views

Strange behaviour of Check

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8
votes
2answers
556 views

Catching error in middle of evaluation of compiled function

I have programmed and Compileed a complicated numerical function. The function has singularities (i.e. are infinite) at certain input numerical values. I need to ...
7
votes
3answers
2k views

Need help with exception handling

I have read the docs for Catch, Throw, and friends multiple times, and I confess that I find them utterly incomprehensible... ...
6
votes
0answers
134 views

How trap expression that doesn't evaluate?

If evaluating an expression produces an error, it's easy to trap that using Check or Throw......
5
votes
1answer
123 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
3answers
94 views

How to implement try/catch/end try in Mathematica in the most simple way?

There are lots of question/answers about exception handling in Mathematica. I still find exception handling in Mathematica too complicated to work with. I find Maple much simpler and easier to ...
5
votes
1answer
141 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
83 views

How to Quiet[] only the first argument of Check[]?

I have a Check of the form Check[expr,failexpr, {NIntegrate::slwcon}] If expr throws slwcon, I would like to redo the calculation with higher precision by ...
5
votes
1answer
248 views

Error invoking Information on functions containing Legended

Bug fixed in version 11 In adapting some plotting functions to utilize the PlotLegends option of version 9, I came across the following errors: ...
4
votes
1answer
1k views

Exception/Error handling using returns codes

There is good explanation available for error handling on this and similar links. Here there is information on handling inappropriate input arguments and handling unprocessed functions using ...
3
votes
1answer
328 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
1answer
502 views

Stopping NDSolver at time of error

I am using NDSolver and WhenEvent to solve a system of differential equations. I get this message: ...
3
votes
1answer
26 views

How to handle numerical exception within a compiled function

I'm trying to evaluate a series of expressions, which, given a set of parameters, may be complex. Instead of throwing a CompiledFunction::cfn, I'm trying to catch ...
2
votes
1answer
39 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
730 views

Handling Overflow

I have a notebook which takes in a user-defined function and starting value and tracks the orbit of the particle under iteration of the function. The problem occurs when the user enters a starting ...
2
votes
1answer
59 views

any way to stop all the following evaluations?

I often slect the whole notebook to evaluate. Sometimes some functions may return wrong parameters, which may happen, for example, I may have forgotten to specify values to some variables in the ...
2
votes
1answer
281 views

FindRoot over a domain, but give domain boundary if no root exists

I call r = x /. FindRoot[f[x] == 0, {x, 0, -5, 5}] f[x] is always monotonic, but sometimes it doesn't have a root in the ...
2
votes
0answers
75 views

How can I deal with a SystemException?

I have a list of functions that are being evaluated, using ParallelTable[], and continue to get the error message: ...
2
votes
0answers
103 views

What is a way to handle “QuadraticProgramming” method for FindMinimum crashing the kernel?

I need to solve about a million of QP problems, each having about N=2000 variables with N-2 inequality constraints and 2 equality constraints. Trying to use the "InteriorPoint" method freezes my ...
2
votes
0answers
86 views

Is there a function similar to SQL's Iserror? [duplicate]

I have an output which I want to hide if there is an error otherwise display it. The output is a Dynamic[output] so I can't simply use something like ...
1
vote
2answers
35 views

How to find all Solve::error_names? Or How to Catch all except one specific error?

Basically, all what I want is to use Solve and detect when it can't solve the equation, except for the case when it throws Solve::ifun which will consider as OK and ...
1
vote
0answers
20 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: ...
0
votes
1answer
27 views

Avoid an Error Message when Importing

Consider the following code Button["Import", file = SystemDialogInput["FileOpen"]; data = Import[file], Method -> "Queued"] which yields a button which, ...
0
votes
1answer
151 views

Catching and reacting to a warning [closed]

I have a program which can lead in certain cases to a division by zero. I would like to know if there is a way in Mathematica to make a conditional statement like the following one: ...
0
votes
0answers
29 views

After any execution temporary error comes out ,How to fix error in temporary directory

how can I repair this error that started to come out of nowhere, I have not made any changes in the equipment but mathematica accuses that error ...
0
votes
0answers
92 views

How to handle exceptions and failures in Mathematica?

In python I can write fallback values like: ...
0
votes
0answers
69 views

FinancialData returns a Failure[] object

What is the recommended way to deal with this (basically, if I get "Failure", I would like to say that the data is missing, and I can obviously call the function inside another function, check if the ...