# All Questions

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 ...
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. ...
47 views

### How to set Ticks for an AngularGauge?

How do you set custom ticks on an AngularGauge. ...
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 ...
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: ...
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 ...
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 ...
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"] ...
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 ...
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, ...
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 ...
90 views

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

Turn on Needs["CompiledFunctionTools`"] First example ...
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 ...
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 ...
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 ...
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 ...
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. ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
61 views

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 ...
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 ...
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 ...
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 ...
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, ...
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. ...
103 views

### Bug in ListLinePlot[] when Filling up and down?

I'm trying to understand this apparently incorrect Filling behavior in ListLinePlot[]. Evaluating this ...
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 ...
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 ...
54 views

### Evaluate cells error in Mathematica

Clicking on the button generated by the following code: ...
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: ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
62 views

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

I have a simple object orientation example using this solution: ...
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 ...
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 ...
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 ...
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 ...