For questions on interpreting existing error messages that you have encountered, as well as writing and managing messages, assertions and checks for your own functions.

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31 views

Strange bug involving a list, “Objects of unequal length” [on hold]

Please let me know if I should attach all of the code. I have only decided to attach the problem code to make it easier to read. So hopefully it is enough. sortedTally is a list generated from ...
0
votes
2answers
58 views

Function works only after printing variables inside [closed]

For the input: pickTwoParts[{a, b, c}], the right output is: {{a, a b, a c, b, b c, c}, {b c, c, b, a c, a, a b}}. I am getting that output, but only after uncommenting the lines: ...
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0answers
28 views

Errormessage Set::setps [closed]

I want to plot some data with ErrorBars. The following code generates the desired image: ...
0
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1answer
49 views

NDSolve::bcsol?

I'm writing a code to numerically solve a differential equation. It has to repeat the process several times since there is a variable involved which is unknown, and the equation is fit to some ...
1
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1answer
47 views

NMinimize error: Nearest::neard:

I have this function GuessError, here's a plot assuming a single variable x, Plot[GuessError[10^x, etc..], {x, 8, 12}] , being etc some more variables which are ...
2
votes
1answer
50 views

Why isn't Table iterator value inserted in failed NIntegrate arguments?

Consider this simplest example: Table[{z, NIntegrate[f[x], {x, 0, z}]}, {z, {1}}] Here f is not defined, so ...
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0answers
28 views

Understanding HoldSequence and ReleaseHoldSequence in Error Handling

I was playing with GeneralUtilities`PrintDefinitions in V10.1, and find some of native Mathematica functions using ...
0
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1answer
56 views

NIntegrate producing SetDelayed::write message [closed]

I used NIntegrate to calculate an integral with the final limit as a variable, which later will be listed in a table, ...
2
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1answer
55 views

How can I correct error message that appears each time I launch Mathematica?

Each time I launch Mathematica I get the following error message : The specified setting for the option Magnification cannot be used. I have gone to the option inspector and have confirmed that the ...
0
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1answer
37 views

Using Check[] on multiple statements

I am using a loop to run run multiple fits. If a fit fails, I don't want it to either appear in my data or to affect later fits so I am using the Check[] function to catch if any errors occurred (I'm ...
0
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1answer
32 views

aborting at a message, but still save data

This may be an easy question, but I can't find it anywhere. I have a code which solves linear equations in a do loop (possibly compiled) using LinearSolve. To save the results I use Reap and Sow. It ...
2
votes
1answer
75 views

Why this error?

f[x_] := Piecewise[{{1, -0.5 <= x <= 0.5}}, 0]; ProbabilityDistribution[ Integrate[f[a], {a, x - 0.5, x + 0.5}], {x, -2, 2}] output: "Unable to prove that ...
7
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0answers
65 views

Enigmatic message about MaxBend

Referring to the method I proposed for Problem with ParametricPlot Mathematica 10.0.2 throws an enigmatic error message: ...
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0answers
23 views

Is there any way to get more info on an error message?

Many times I receive messages but can't find any documentation on what it means. For instance today I got this error: ...
5
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1answer
93 views

Compilation of `Total` with CompensatedSummation

I sometimes obtain an unexpected error when trying to call a compiled version of Total with compensated summation turned on. More specifically I define ...
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2answers
43 views
0
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1answer
44 views

How to switch on error messages in mathematica 10?

I have mathematica 10 and 8 on different computers. Version 8 always shows me the error message about what goes wrong while I don't see any error message in version 10. I find it quite inconvenient as ...
0
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2answers
97 views

NonlinearModelFit errors

I have read through other forum posts and have seen a few things that I thought would help but I am still having issues. I'm trying to fit some calibration data and am at first getting the error ...
1
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1answer
57 views

How to do predicate logic in Mathematica

I'm trying to formalize and analyze the following reasoning: All equilateral triangles are isosceles triangles. Some triangles are not equilateral triangles. Therefore some triangles are not ...
2
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1answer
46 views

Why do messages only appear first time I evaluate my compiled function?

I declare my compiled function: ...
0
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1answer
41 views

Why does this cause an error? [closed]

In[73]:= f[x_] := Save["C:\\Users\\user\\Desktop\\file", x <> x] f["###"] During evaluation of In[73]:= Save::sym: Argument ...
0
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2answers
111 views

Why won't this graph? [closed]

I'm trying to sketch level curve for z=k for the specified values of k={-2,-1,2} of z= 4x^2 - 4x + y^2 + 2y So I changed ...
1
vote
2answers
66 views

Maximum likelihood estimation based on frequency table

I have a frequency table of grades, I'm trying to estimate the distribution as a truncated normal distribution (a grade below 65 is a failing grade and doesn't count). Since I don't have the actual ...
2
votes
1answer
183 views

Compile a MeijerG function [duplicate]

I am not very experienced with Compile, I tried to use it for a Meijer-G function ...
0
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0answers
34 views

Possible bug in shallow representations of expressions in messages

I got the following message in Mathematica 10.0.2: I do not have questions about the message itself, but rather about its representation. The program was maninulating with mathematical expressions ...
9
votes
1answer
206 views

Can a System symbol spontaneously leak into a Global namespace?

During the development of a program to process bioinformatic data, I have encountered a peculiar shadow warning: Global...
1
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1answer
106 views

FindFit::nrlnum: error with FindFit

I am trying to write a code to fit actual data of the orbit of a star with Mathematica 8. First I tried to write a code to fit a mock orbit, using the Application with differential equations (the ...
1
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1answer
37 views

A While loop where the loop clause can receive problematic input

Consider the following highly artificial example: ...
0
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0answers
51 views

Two installations of MMA 10.0.1.0 differ in behavior

I'm seeking advice on how to track down what might cause the following difference in behavior. I have two independent installations of MMA 10.0.1.0, both on Mac OS X Mavericks on identical x86 Mac ...
0
votes
1answer
36 views

Error with numerical summation - how to specify “n choose r”?

I'm trying to do the following sum: NSum[((50000 - x) choose x)*(1/3^15)^x*((3^15 - x)/3^15)^(50000 - x), {x, 1, 4}] But I keep getting an error saying: ...
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0answers
81 views

Is there a minor bug in Neal Alexander's TopologicalSortAll[]?

There is an amazing answer to this question: All possible topological orderings of a graph By Neal Alexander. However, as user "dark blue" (I am not this user) notes: ...
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0answers
96 views

What does this Java error mean? Why is it raised?

I want to launch some kernels on a cluster that uses SGE. The server's operating system is Linux Cent-OS. According to Mathematica documentation, I've added these commands inside my code: ...
5
votes
1answer
128 views

How to use Message with an error string without predefining it first?

I need a very simple error reporting using Message. But I do not want to pre-define each error message separately as shown What are the best practices / most common / idiomatic ways to report errors ...
2
votes
1answer
92 views

Breaking out of NDSolve

I am solving a coupled set of differential equations with NDSolve for 6 unknown functions of time. At a certain point in time, the system hits a singular point where the potential governing the ...
4
votes
1answer
64 views

The specified setting for the option FEFloatIterator cannot be used

I am currently trying to get a numerical simulation running where one variable is iterated over many orders of magnitude. As the calculation takes pretty long, I would like to display a ...
1
vote
1answer
76 views

For loop with MapIndexed and If [closed]

I have a for loop that uses MapIndexed and If to build a a list called avald1. The problem ...
1
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0answers
48 views

Capturing error message information

Error messages returned from SendMessage occasionally have useful information in them. For example: ...
3
votes
2answers
157 views

Interpolation function error: Interpolation::femimq and Interpolation::fememtlq

In Mathematica 10 the following command ...
0
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0answers
13 views

Encountering a Tag times Protected error, but cannot find the source [duplicate]

I am very new to using mathematica, and I have seen these errors frequently. Usually I can find a solution to my issues by stumbling around, but this is my first time defining a function like sp[t_], ...
2
votes
1answer
84 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 ...
0
votes
0answers
53 views

SetDelayed::write is Protected error on Linux not PC

I have 2 computers, a PC and an Ubuntu computer both with Mathematica 10. I am running the exact file with the exact support files on both computers, but just on the Ubuntu I get the following error ...
9
votes
2answers
87 views

Detect Messages within an expression without losing the return value?

I know that Check[expr,failexpr] is a mechanism to catch messages. The problem with it is that if a message is generated within ...
7
votes
2answers
107 views

Error when implementing StartProcess[] in loops (Do, While, Table)

I'm using Mathematica to control another program (Surface Evolver) through the terminal (ie using StartProcess[]; and ...
5
votes
1answer
86 views

Error messages from TensorContract and TensorReduce

I am struggling with a few errors when using symbolic tensors. I am using mathematica 9.0.1.0, linux x86. The following code generates what seems to me an incorrect tensor, this is the smallest ...
7
votes
2answers
170 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 ...
5
votes
1answer
195 views

Sentiment analysis of tweets

I want to use Mathematica for a sentiment analysis on tweet-messages. For that purpose i selected several tweets. Each tweet is interpreted by myself as positive (pos) of negative (neg). For example: ...
3
votes
1answer
133 views

How do I format Compile[] correctly?

My Mathematica skill is still rusty, so kindly bear with me. I'm having problem formatting expression to compile the function correctly: $\sum _{g=1}^G \sum ...
2
votes
1answer
34 views

Replace error messages with zeros in a table

I'm working on a project of Nuclear physics and I'm passing results of a simulation program to mathematica via a txt file. I then read the values I need to read and plot them. The problem is that ...
4
votes
1answer
57 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 ...
-1
votes
1answer
30 views

Iterator bounds error when defining function [closed]

It's been a while since I've done any multi-line functions in Mathematica, so maybe I'm just missing something. I've created the following function, and I immediately get an Iterator bounds error when ...