4
votes
0answers
104 views

Why does Solve work in v9.0.1 but not in v10.3.1

I want to solve the following DE $$ P'=k(M-P)P, P[0]=53.08, P[50]=23.192, P[100]=76.212.$$ The Mathematica command is ...
4
votes
0answers
60 views

Numerical instabilities of a convection-(non-)diffusion equation when shrinking from a square to a triangular domain

I am trying to evaluate a parameter-dependent indefinite integral using a PDE-based scheme I described here, and I'm having some trouble when I try and cut down the domain from a square to a triangle. ...
4
votes
0answers
47 views

How to set Ticks for an AngularGauge?

How do you set custom ticks on an AngularGauge. ...
4
votes
0answers
211 views

Strange behaviour of NotElement in Reduce

Bug introduced in 8.0 or earlier and persisting through 10.4 or later Confirmed, as bug, by WRI: [CASE:3527549] I have observed curious behaviour on domains supplied to ...
4
votes
0answers
170 views

Finding eigenvalues in Mathematica: why so slow?

I am trying to find the eigensystem of a large sparse real symmetric matrix, and I only need the lowest 40 or so eigenstates. The relevant code is as follows: ...
4
votes
0answers
64 views

Create an adequate 'training set' to train a ClassifierFunction which performs the role of the built-in `SubsetQ`

I am trying to "grow" my own SubsetQ function using Machine Learning methods. My cSubsetQ when given two lists (listA and ...
4
votes
0answers
63 views

Non-English spell checking dictionaries in Mathematica: Where to get them?

I simply want to be able to spell check my (german) notebooks. There was a question similar to this but with no answer: Non-english spell check dictionaries for Mathematica? You can find this ...
4
votes
0answers
83 views

Increasing resolution in AnatomicalData

In version 10.3 one can get an image of an anatomical structure, such as a brain, using this code: AnatomyData[Entity["AnatomicalStructure", "Brain"], "Image"] ...
4
votes
0answers
79 views

ParallelTable slow down, Region functions

I am experiencing speed issues with ParallelTable. There are a few related problems on SX posted here and here, but no resolution. The various respondents to those ...
4
votes
0answers
96 views

Fitting data with unique variable per measurement

Imagine we are in the following situation, we have a nonlinear system of functions $f$ with coördinates $x_i$, and unknown parameters $\delta_i$'s and $t$. Let this system be defined as, ...
4
votes
0answers
128 views

new kernel crashes using DSolve in 10.3.1

Update: I added small movie showing the crash, since others who tried it so far could not reproduce it on their system. Original question I am finding new problems with ...
4
votes
0answers
90 views

Is it possible to prohibit unnecessary CopyTensor in Compile? Just like .noalias() in Eigen library?

Turn on Needs["CompiledFunctionTools`"] First example ...
4
votes
0answers
93 views

How can I add column-rearrangement-by-mouse-dragging to my dataset display function?

A subject that I seem to take at heart... I was expecting an upgrade of the default Dataset display in MMA 10.3.1. It did not happen. Among the features I would have liked to see improved is a ...
4
votes
0answers
81 views

Can one combine Mathematica with bash script?

For example, I create a Mathematica nb file which can work on a set of parameter values or several files at once. It needs me to change the parameter after finishing computing one parameter. If I ...
4
votes
0answers
54 views

Usage information garbled when printed to pdf or printer

In Mathematica v10.2 running in the notebook Information ?Integrate yields the following But, when printed to printer or ...
4
votes
0answers
106 views

Exploring formal limit definition

I found a few demonstrations on the Wolfram Demonstration Project site that help users to explore the formal definition of a limit. That is, $$\lim_{x\to a}f(x)=L$$ if and only if for every ...
4
votes
0answers
53 views

How to display EntityProperty objects with their CanonicalName?

Is there a way to display EntityProperty objects with their CanonicalName instead of the text they are currently displayed with. ...
4
votes
0answers
58 views

NMinValue , NMaxValue , NMinimize and NMaximize behave poorly for 2-dimensional function unless the constraint is posed as an ImplicitRegion

I am making a plotting function where I need to know the max value the function takes over the given 2D range. I noticed a difference between the behavior of ...
4
votes
0answers
52 views

How to know the string data/settings, of some options/functions

It is known that several functions and options take some sort of input in this form: option->"something" function["something"] The simple example for this is ...
4
votes
0answers
123 views

Autocomplete not working with tab key on Mathematica 10.3 Linux

when I want to autocomplete a function I can't use TAB key to expand what I typed in. If I press TAB, it escapes the popup suggestion menu. Autocomplete only works if I press ENTER. Furthermore,once ...
4
votes
0answers
62 views

How to put 2 or 3 NeumannValue conditions?

I want to solve numerically the heat exchange of a fin in transient state and two-dimentional, here is my attempt but instead of put DirichletCondition on ...
4
votes
0answers
71 views

Planning flights for a special route

I want to plan a world trip with Mathematica. So I already have the dataset with all the cities I want to visit and the tour (with the command FindShortestTour). So ...
4
votes
0answers
67 views

Avoid Evaluation of Function at NDSolve

I have a huge "black-box" f function, which I want to integrate. Let's define it: f[x_,y_,a_]:=a*Exp[-(a*10000)(x^3+y^3)] as ...
4
votes
0answers
74 views

File Formats for Scientific Data

I have a simulation written in another language which currently just dumps all its data (doubles, lists of doubles, lists of lists of doubles) in lines in ASCII, and then I read it into Mathematica by ...
4
votes
0answers
56 views

Bug: quote signs with parentheses followed by superscripts in same cell

(x + 1)^2 where ^2 should be a superscript that I do not know how to display here. If you type in a pair of quote signs ...
4
votes
0answers
56 views

Is there any way to make custom AsynchronousTaskObjects?

One of the pieces of functionality that intrigues me the most in Mathematica 9+ comes in the form of StartAsynchronousTask and friends. However, it can only start ...
4
votes
0answers
61 views

CloudDeploy task to use DatabinAdd?

Long time reader, first time writer. I've been following the presidential candidates' popularity on Facebook as a side project recently, and storing the total number of likes on their page daily on ...
4
votes
0answers
72 views

Size problems combining objects in a Graphics using Inset

The Problem I need to put together different graphics objects in a precise way inside a Graphics. Some objects are drawn directly by graphics primitives, some ...
4
votes
0answers
36 views

DateObject's DateFormat option has inconsistent result in TimelinePlot LabelingFunction and by direct call

I want to strip time and time zone from dates in the LabelingFunction of a TimelinePlot. I am using the ...
4
votes
0answers
78 views

List(Log)Plot with “high” resolution results in various warnings, e.g. BinCounts::step

Here is some very odd behavior from ListLogPlot. So if I want to plot a function using LogPlot, I can specify the ...
4
votes
0answers
83 views

Improving the speed of an optimization algorithm via compilation and parallellization

I have written an implementation of eight variants of the PSO-algorithm and I want to test them over a set of test functions. I am using parallelization as it improves the speed a lot and I have also, ...
4
votes
0answers
69 views

How to write Coordinate Chart in Xcoba in index form?

I am using xCoba for manipulating tensors. I do the usual, defining my metric, manifold, chart etc. ...
4
votes
0answers
103 views

Bug in ListLinePlot[] when Filling up and down?

I'm trying to understand this apparently incorrect Filling behavior in ListLinePlot[]. Evaluating this ...
4
votes
0answers
31 views

Why are Parenthesis not added to CExpression in Package SymbolicC?

The documentation of SymbolicC, more specifically of COperator, states that Parentheses are added as necessary together with the ...
4
votes
0answers
112 views

Integral of DiracDelta giving an unusual answer

I have been getting a number of seemingly inconsistent solutions to integrals of Dirac delta functions in which the integrand evaluates to DiracDelta[0] at one of ...
4
votes
0answers
54 views

Evaluate cells error in Mathematica

Clicking on the button generated by the following code: ...
4
votes
0answers
70 views

Incompatibility between CDF document and reveal.js

I am making some reveal.js-based slides with a CDF document embedded. The minimal example include the files: ...
4
votes
0answers
93 views

Why does FromDigits transpose its argument (sometimes)?

a = {{1, 2}, {3, 4}, {5, 6}} ; FromDigits /@ Transpose@ a == FromDigits @ a (* True *) The only "strange" syntax I've found in the docs is But it doesn't ...
4
votes
0answers
113 views

Eigenvalues FEAST method - performance is very variable

I am running the FEAST method option for Eigenvalues on sparse matrices of dimension around 500,000. I look for about 50 ...
4
votes
0answers
97 views

errors in CUDA example

It seems that there are some errors in the documentation page Consider these functions in the documentation CUDA Programming. However, I'm not a expert in CUDA nor C, could you check whether these are ...
4
votes
0answers
86 views

“\:”; flagged as syntax error

While answering question 94032, I noticed that Mathematica 10.2 flagged "\:" <> IntegerString[62378, 16, 4] with a red bracket, apparently indicating a ...
4
votes
0answers
103 views

Multiple Constrained Sum

I need to perform a multiple summation, that obeys some conditions. This arises in the study of a statistical physics model. q=Exp[-β]. I would like to ask if ...
4
votes
0answers
54 views

What does OutputResponse[sys, { {u1,u2,u3}, {v1,v2,v3} } ] do?

I am puzzled by the result of OutputResponse[sys, {{u1,u2,u3},{v1,v2,v3}}]. OutputResponse is used this way in the first "Application" in the documentation for ...
4
votes
0answers
62 views

How to set a property in an object with association syntax?

I have a simple object orientation example using this solution: ...
4
votes
0answers
77 views

Method of characteristics, recursion formulas

I'm helping a friend out with a problem. He needs to plot out the solution to a water surge in a pipeline. I have all the parameters set and I've put the equations in Mathematica, but I can't get the ...
4
votes
0answers
71 views

Reduce doesn't solve this equations with condition

Reduce[{4==Abs[-1+2 Cos[2A]+2 Cos[2B]+2 Cos[2(A+B)]]},{A,B},Reals] worked well, but ...
4
votes
0answers
171 views

Goodness of Fit of Copula Distribution

I am trying to find out goodness of fit of copula distribution, but Mathematica 10 gives me the same answer for each copula type. e.g ...
4
votes
0answers
93 views

Extracting Code Used in Wolfram Alpha Query Output

If I type == moon texture map into Mathematica it sends a query to Wolfram Alpha and gives me the following output: A 3D sphere with a moon surface texture is ...
4
votes
0answers
91 views

Does ContourPlot3D leak assignments inside Manipulate?

Update 5 Aug 2015 -- Karsten 7. found a minimal example of leaking not involving Manipulate, so the role of Manipulate seems ...
4
votes
0answers
106 views

How to define a bivariate skew normal distribution?

There is BinormalDistribution that handles easily bivariate normal distribution and its mixtures. There is also ...

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