# All Questions

4answers
235 views

### Replace matrix rows conditionally while avoiding For loop

I have the following variables: myMatrix={{0,0,0},{0,0,0},{0,0,0},{0,0,0},{0,0,0},{0,0,0}} myIndices={1,3} I need to replace the rows ...
1answer
44 views

### Position not working? [on hold]

I have the list: myList={0,0,0,a,b,c,0,0,d} I need to find the positions of all elements that are non-zero. I do like this: ...
0answers
70 views

### DSolve returns an answer that is not a solution

Investigating DSolve misses a solution of a differential equation, I came across this odd behavior of DSolve. The following DSolve command returns an answer to the ...
0answers
39 views

### Plot is wrong for oscillating function [duplicate]

It doesnt even oscillate that much Plot[Exp[-Pi x^2 + I ( 60 1/(x^2 + .6) + 0.2)] // Re, {x, -2, 2}, PlotRange -> Full, MaxRecursion -> 15] What is ...
0answers
47 views

### How to define a bivariate skew normal distribution?

There is BinormalDistribution that handles easily bivariate normal distribution and its mixtures. There is also ...
0answers
29 views

### How to (efficiently) export the tutorial files as PDF?

The English version is freely available online at wolfram learning center. I also have a Chinese version of Mathematica 9.0.1. I wonder if there is an easy way to export the help files as PDFs from ...
0answers
45 views

### Plot experimental data from .dat file [on hold]

I have a huge table of 42 columns of data in a .dat file, which I need to plot as a 3d-plot. How can I do that?
0answers
66 views

### NonlinearModelFit::nrnum error [on hold]

I'm trying to fit data (including some small negative numbers at both extremes) to a normal distribution. ...
0answers
49 views

### How to replace element by element in a list? [on hold]

I have the list: myList={{a,b,c},{d,e,f},{g,h,i}} I need to transpose every element individually, so I do: ...
1answer
45 views

### Extending Button's Method -> “Preemptive” 5 second timeout

This is an example from the documentation for Button : ...
1answer
82 views

### How to make sense of LowpassFilter, SampleRate and the cutoff frequency ωc in different Mathematica versions?

How do you make sense of the scale of "time" and "sampling" when using LowpassFilter and SampleRate ? Given the test data with ...
0answers
34 views

### Mixture of a bivariate distribution defined as a copula

I define a bivariate distribution: ...
1answer
113 views

### How can I prevent SHIFT-ENTER moving the editing cursor?

What I do: Here press Shift+Enter to evaluate. What I get: The cursor disappeared What I want: The cursor retained Workaround: Up Arrow as many times as it takes, Right arrow as many times ...
1answer
79 views

### Substitute a function's definition for its name

I'm having trouble with a function which is supposed to work on another function. Simplified version: ...
0answers
32 views

### What is diffusion map? [on hold]

I have trying to understand this diffusion map,I know it has something to with statistics and reducing no of variables in calculation, I was reading a article which uses this diffusion map to ...
0answers
39 views

### ListLogPlot error when forcing y axes start at 0

I came across an error I can not circumvent. When plotting the following: ListLogPlot[Table[1/x, {x, 1, 100}]] I receive a functioning plot. If I now want to ...
1answer
32 views

### How can one easily toggle the “insufficient version” warning message in CDF and Mathematica?

Unfortunately people use different Mathematica and CDF versions and the default setting of "InsufficientVersionWarning" in MessageOptions is True both in Mathematica and the CDF Player (which is quite ...
1answer
92 views

### Efficient upsampling of multidimensional array

I would like to efficiently upsample a multidimensional array. It's a 5000*5 matrix where each element is a submatrix 12*12 and it is that 12*12 matrix I want upsampled (to 24*24). The upsampling ...
2answers
182 views

### Mathematica 10, Show, and PlotRange

I have recently moved from Mathematica 8 to Mathematica 10, however I'm having a problem with PlotRange->All in combination with Show[]. For example, ...
2answers
71 views

### Options for a function I define that can be passed to functions I call in the definition

I know, this is very close to Functions with Options and/or Function with custom Options and modified Options for built-in Symbols, but I don't get it. My function looks like this one: ...
0answers
20 views

### cumulative probability about the number of variable [duplicate]

the codes are: ...
1answer
34 views

### Specifying a PopupMenu in a Manipulate expression

In my previous question here, I had a problem with showing GeoGraphics in a CDF document, but thanks to other users, I was able to solve it. But the code I wrote to test my work gave an error. I tried ...
1answer
161 views

### How to change the font color of a variable in whole input cell

I want to track the occurrence of a particular variable in a code. So the idea is to change its color. Usually I do it in a crude way - convert the code into text and then use ...
1answer
38 views

### DateListPlot incorrect time zone

I'm trying to plot energy usage over time using datelistplot but the time zone on the ticks is wrong, data for 7pm shows as 3am The code: ...
1answer
41 views

### Control line wrapping within a Grid cell

I'm trying to display a number tables of data in my document which have column headings that are longer than the cell width for those columns so they need to wrap within the grid cell. I have no ...
1answer
75 views

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1answer
65 views

### Problem in the solution of the simultaneous Ordinary Differential Equation [on hold]

When i am running the following command ...
1answer
78 views

### Plot given points, lines and arcs in 3D

I need to plot 6 points in 3D. I used the command 'Plot' but I couldn't draw it. The coordinates of points $A,A',B,B',C,C',D$ are given. $AD,BD,CD$ are straight line segments $AA',BB',CC'$ are arcs ...
0answers
52 views

### Why can't I paste data from Notepad into Mathematica 10 in Windows 8.1? [on hold]

I can't paste data that I have copied from Notepad in Windows 8.1 into Mathematica 10. I was able to do this when I had Windows 7 and Mathematica 8. Now when I try to paste into Mathematica 10 using ...
1answer
101 views

### Change in Lighting and Show in V10?

According the documentation for Show: Options explicitly specified in Show override those included in the graphics ...
0answers
24 views

### Why does my contour plot have missing blotches? [on hold]

I think it may have to do with areas on the plot that are very small in value.
0answers
41 views

### Incorrect Display on Linux (+HiDPI)

I have Linux on a HiDPI laptop, and after first installing Mathematica, the default font size is far too small: After searching for a few solutions, this can be fixed by either changing the ...
2answers
110 views

### Module inside of Manipulate Example

Here is a very nice example from The Student's Introduction to MATHEMATICA. ...
0answers
48 views

### Is this behaviour, producing OutputSizeLimitDumpencapsulateOutput, a bug?

Bug introduced in 6.0.0 and persisting through 10.2.0 The input ...
1answer
65 views

### Problem Using Evaluated Replace with Associations

If I define some function like: toISOdate[data_List]:=DateString[data,{"Year","-","Month","-","Day"}] and try to applicate it in an ...
0answers
59 views

### PDE: solving Fokker-Planck equation with initial and boundary condition [migrated]

Here is the problem. We have the following simple PDE: \frac{\partial p(x,t)}{\partial t}= - a\frac{\partial p(x,t)}{\partial x} + \frac{D}{2} \frac{ \partial^2 p(x,t) }{\partial ...
1answer
41 views

### Change Property without re-evaluating [duplicate]

I am working with ContourPlot3D, and my expression takes a long time to evaluate (nearly 20 minutes). So I am wondering if there is a method to changing format ...
0answers
41 views

### DynamicModule's Deinitialization & CDFDeploy

This evaluates fine for me: CDFDeploy["test.cdf", DynamicModule[{}, Dynamic["Hello World"], Deinitialization :> 1]] But this results in a never ending ...
0answers
83 views

### Why does this Graphics3D example change lighting on reorient? [on hold]

What I do: Graphics3D[{Sphere[]},Lighting -> "Neutral"] What I get: but when I reorient: What I want: a stable result! PS The Platform is Wolfram ...
0answers
36 views

### How to change number form of Plot Legend in ListContourPlot? [on hold]

I am creating a ListContourPlot from some very large values. I would like these numbers to be written out in scientific notation (8x10^8, etc.) I've tried the following code: ...
0answers
53 views

### How to produce timely spoken text?

On my system (Mac OSX 10.10.4) the following code produces only the first utterance. The second one is produce when the user interacts in some way with the front end (mouseover, mouseclick). How can I ...
0answers
8 views

### Don't understand about how to solve the first equation with Gauss Elimination [migrated]

Please take a look at the picture. My quesion is: How to solve the first equation with Gauss Elimination that is displayed in the picture. I don't understand HOW.
0answers
30 views

### Set::setraw error help includes Module

Simple program for euler's method. I changed it to this and it works, just not to the extent I want it to. Right now I have to define x and y locally, whereas I'd rather set them as a global initial ...
0answers
36 views

### Override a PlotTheme element at the Options level?

Plot properties defined in a Theme override (supersede) properties defined on Options. This can be undesirable in a case such as: ...
3answers
222 views

### How to imitate list comprehensions for constant arrays?

In Python, ['a'] * 10 generates ['a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a'] and ...
0answers
4 views

### How to solve a equation task [migrated]

I have found a equation task that is: y=0,5x+2,5 y=3x-1 The answer and its process is: ...
0answers
91 views

### How to make a Nebulabrot?

A Nebulabrot is a generalization of the Buddhabrot, a fractal rendering technique related to the Mandelbrot set that sort of looks like a meditating buddha. The Buddhabrot rendering technique was ...
2answers
56 views

### How can I adjust the global input variable of a function to the value of a local variable within the function

I am trying to define a function f[l_] that will perform an operation on whatever input variable I use (normally I use l which ...
2answers
95 views

### How to write a loop

I try to create a table which will describe traffic paths at a crossroads. Instead of using copy-paste repeatedly, I would like to write a loop. For example: ...
0answers
46 views

### How to segment letters and text blobs?

This new article from Google research describes how their Translate app preprocesses an image on a phone before applying convnets: It needs to weed out background objects like trees or cars, and ...

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