Questions tagged [error-tracking]

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Why is Mathematica saying this sequence tends to $0$?

I am a complete novice in Mathematica so please bear with me. I am trying to graph a sequence that converges to $\pi$ but after $27$ iterations Mathematica just goes crazy and I am not sure why. I got ...
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1answer
58 views

Error test failure for the following system

My question is about a reason of the inability of Mathematica to integrate the given system of differential equations, that depends on parameters, in a stable way: for some values of the parameters ...
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61 views

Mathematica stops working with no warning/error

I have some long computations on my Mathematica notebook. For some reason they stop and Mathematica gives me no reason as to why. No warning. No erros. If run the "Initialization Lines" (...
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45 views

RegionPlot outputs System`ReduceDump`

I'm using Solve[] to find the solutions to a system of equations, then checking their stability in a Hessian using ...
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1answer
81 views

Strange error not found in a monte carlo code, Infinite expression 1/0 encountered

I've been trying to code a kinetic monte carlo simulation for a dimerization reaction, 2M ---> D. However I have a kinetic Monte Carlo code for a first order decomposition reaction of AIBN (that's ...
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1answer
83 views

How to implement an “if an error occurs”-condition in Mathematica programming?

In general Mathematica may return a value even if NDSolve has run into error. A simple example is ...
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1answer
53 views

Why does the mix of Exclusions and SymbolicProcessing->0 sets my integral to $0$?

I am trying to compute a $5$-dimensional integral, which may or may not be zero. I do believe it is finite though, at least for the values $\epsilon$, $\sigma$ used here. The integral is given in the ...
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2answers
90 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 ...
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1answer
54 views

Catching NDSolve Singularities

I am using NDSolve to solve a system of equations with changing initial conditions (I'm using NDSolve multiple times). However, for particular initial conditions I am getting an effective step size of ...
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2answers
53 views

NDSolve: How to perform a reverse integration consistency check?

Let there be the following NDSolve code: s = NDSolve[{y'[x] == y[x] Cos[x + y[x]], y[0] == 1}, y, {x, 0, 30}] I think it ...
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1answer
40 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 ...
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1answer
153 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
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0answers
68 views

Issues with symbolic integration

I am trying to do the following indefinite integral, ...
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1answer
159 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 ...
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2answers
154 views

Avoiding a for loop to create a list

I am trying to evaluate: ...
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0answers
61 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. ...
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1answer
85 views

Ignore message in `Check` without silencing

Check[expr,failexpr,checkedMessages] will evaluate expr and if it encounters any of the messages in ...
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0answers
49 views

customisable error checking, message handling code

I have an iterated computation running in a while loop, which is bound to fail at some point, at which point I want it to stop, e.g. ...
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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: ...
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0answers
414 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 ...
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1answer
121 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 ...
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2answers
3k 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 ...
1
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1answer
79 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 ...
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1answer
87 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 ...
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2answers
485 views

DSolve running forever

I have no idea how to speed this up. Does maple do a better job at solving this?
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2answers
150 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 ...
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0answers
48 views

Errors with NIntegrate: NIntegrate::ncvb and NIntegrate::slwcon

The image shows the array (W) I'm trying to integrate. It gives the following errors: 1. NIntegrate::ncvb 2. NIntegrate::slwcon I tried excluding the singularity points; adjusting the accuracy goal, ...
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1answer
130 views

Plotting of an error estimate of `NDSolve`

So, in an earlier post, (see here), I asked a question regarding a surface of section for a system of coupled non-linear ODEs. What I am after now, is the numerical precision of the results I get back....
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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 ...
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1answer
116 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 ...
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2answers
972 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 ...
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1answer
78 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 ...
9
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1answer
286 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 ...
2
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1answer
83 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, ...
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1answer
229 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 ...
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2answers
232 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 ...
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2answers
172 views

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

I'm trying to integrate a large function like this ...
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5answers
170 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 ...
5
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2answers
692 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 ...
3
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1answer
581 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: $a=1.01 \pm 0.18$ $b=0.92 \pm 0.11$ $c=2.2 \pm 0.2$ ...
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1answer
64 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: ...
4
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1answer
232 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 ...
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1answer
170 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 ...
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1answer
589 views

What does Segmentation fault (core dumped) actually mean? [closed]

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1answer
211 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 ...
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2answers
4k views

SystemException[“MemoryAllocationFailure”, …] with NMaximize

I have a complicated analytical expression that needs to be maximized with respect to a parameter t: ...
4
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1answer
109 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 ...
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2answers
354 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, ...
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2answers
154 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 ...
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2answers
18k views

How to fix this error : SetDelayed::write: Tag Plus in (<<1>>)[x_] is Protected.? [duplicate]

I don't get the meaning of the sign <<>> and also from which line the error is coming as I have a program of more than 30 lines with many defined functions without using "Module" . Is not there ...