# All Questions

391 views

85 views

### Background of PlotMarkers

I use the StandardReport style sheet in my notebooks, but I would like to export plots without any backgrounds. Apparently, there isn't a global option to change the background on a plot, so I change ...
53 views

### BarChart with relative abundances as chart labels

I want to make the following bar chart, but with relative abundances on top of the chart labels. I get the absolute numbers, but not the relative abundances: ...
273 views

### What is the font of these control labels?

What is the font of these control labels? I've gone through every font Mathematica offers (through the format GUI) and don't see a match. Haven't had any luck with default format files either. I'm ...
996 views

### ParametricPlot and PlotLegends don't seem to cooperate

Bug introduced in 9.0.1 -- fixed in 10.0.0? I noted that only part of the legend shows up in ParametricPlot using v9's ...
174 views

### Checkerboard background on plot (potentially using prolog)?

Currently I have a plot of a complicated function with gridlines turned on. Is there a way to shade a checkerboard pattern of alternating colors between adjacent grid cells? So far, I have tried ...
96 views

### What's the name of the default font used in Mathematica 10?

I really like the default font in Mathematica 10. So I would like to use it for my other applications. I tried to search for the name of the font, only found that a lot of people is talking on how to ...
131 views

### Assigning new value in association

I experienced a problem in changing values in an association and broke down the problem to the following: Given a list of association (here with one element): ...
73 views

### Showing Legend in Wolfram Mathematica

The code below displays a histogram of the data and superimposes plots of five Weibull distributions for comparison. I have assigned colors to each Weibull curve in the distribution plots. How can I ...
318 views

### Mathematica 10 issue: working with Entities slows down recurrence equations [duplicate]

I was looking at the Mathematica code given at http://community.wolfram.com/groups/-/m/t/326240 where example code is given to simulate the spreading of a supposed Ebola outbreak in Nigeria: ...
435 views

### How to create a Disk with smoothly changing coloring?

I want to have a disk. But this disk shouldn't have a fixed color; instead, I'd like it's color to fade smoothly. Until now, I came up with two ideas how to achieve this. Idea #1: ...
140 views

### No legends in parametric plot

plotting some descibing functions, I wondered why I don't get any legends in my plot. The describing functions (and options): ...
80 views

### Piecewise function and integral function

Given a piecewise function f[t_]:=Piecewise[{{Exp[-1/t^2],t>0},{0,x<=0}}], I can define another function like this: ...
55 views

### Assigning a value to specific product [closed]

I was wondering if there is a way to assign a value to a specific problem. For example if I wanted $a\cdot a$ to equal $-1$. How would I go about doing that?
463 views

### Cropping a Voronoi diagram

Someone know how can I get the correct crop of this Voronoi image using RegionFunction? As you can see, there is a lot of undesired white regions inside the left ...
68 views

### Show function doesn't plot two graphics [duplicate]

I've got a following code snippet: ...
203 views

### How do I remove the quotation marks from each element of a list containing dates that I have import from excel?

I've been stuck in this problem for 1 week. I just want to make a graph (Log-Return vs time (in year, month, day)). The code is: ...
123 views

### FunctionInterpolation with vector output and scalar input

Apparently it is possible to build and InterpolatingFunction that accepts a vector input and returns a vector output: ...
74 views

### What to use instead of ReplaceAll to replace a parameter with a number before the evaluation of an integral?

This is probably very simple but I don't see the solution now. Let us say I have a variable e defined as e=n ReplaceAll can subsitute n with value 3 using ...
323 views

### Long list of similar rules

Given the following: ...
424 views

### Finding all sublists or substrings of a given list/string

Given a list or string, how do I get a list of all (contiguous) sublists/substrings? The order is not important. Example for lists: ...
58 views

### Enormous and unclear output when using Solve

After running for about 30 minutes the program yields the below-given unclear output (of course I didn't copy the whole output, only a small part of it). So it explicitely gives 3 possible solutions ...
65 views

### Unable to start the front-end

I just updated to Mathematica 10.0.2, and was hoping that it would fix a problem that I had been having where I go to run Mathematica and nothing comes up. If I open task manager, I can see that ...
58 views

### ColorFunction in GeoRegionValuePlot

I don't understand ColorFunctions so any general pointers will be greatly appreciated. My specific question is the following. I want to animate a GeoRegionValuePlot. In the toy case below I have two ...
115 views

### The inverse Fourier transform of a rather complex function

I am using Mathematica 7.0 and trying to find the Fourier transform of a rather complex function g. The function g is defined by ...
141 views

### Nash equilibrium in game theory?

Are there examples of the solution of Nash non-cooperative games with mixed or pure strategies? How could be implemented in Mathematica 10?
66 views

### Plotting a function with multiple colors, without modifying ColorFunction

I have a function $f$ and a set $U$, and I would like to plot $f$ with a different color on and off $U$. At the moment, I am using a ColorFunction with an "if" ...
75 views

### My code of plotting a two-variable function is too slow [closed]

I have a code in which my complicated function to be plotted is F(x,p). I would like to graph it for 5 values of p equal to 10^7, 10^8, 10^9, 10^10 and 10^11 for x values between 0.01 and 0.99. All ...
49 views

### Dynamic check box with import!

Here what i am trying to do: I have a list of the names of excel files, for example s={"red carpet.csv","red box.csv","black carpet.csv","black box.csv"}; i am ...
9k views

### Struct equivalent in Mathematica?

I really miss having something like a struct in Mathematica. I know of (and regularly use) a couple of programming techniques which feel like a ...
59 views

### why RegionPlot has cut in ring when changing plot range?

I am not sure I understand this one, thought to check with the experts. Please compare ...
162 views

Workbench 2.0 was an extremely useful tool for Mathematica Developers. I received an early release of Workbench 3.0 to work through debugging issues encountered with Mathematica 10 and Workbench 2.0. ...
146 views

### Long running ToElementMesh with very “large” domains

I'm trying to solve a system of PDE over a large domain. This doesn't means I need to have a huge amount of mesh points and mesh elements to discretize the domain. Just that the domains has a big ...
417 views

### Graphics3D: Objects with holes

In a recent project, I found out that there is a big limitation when using Graphics3D to construct objects - it lacks the ability to construct objects with holes in ...
89 views

### How to obtain numerical answer for equation containing integration

Could some one tell me how to obtain numerical value of $a$ and $b$ from equations below: $$\frac{1+exp(b)}{1+exp(0.9a+b)}=0.95$$ $$\int_{0}^{\infty} \frac{1+exp(b)}{1+exp(a x+b)}=1$$
95 views

### Wrong generalized eigenvalues of large numeric matrices

I've been working on a toy model of a variational method of a Hamiltonian H with an overlap matrix S. The point is that when H and S are small enough, Mathematica gives the correct eigenvalues (≈ ...
90 views

### Selecting values over lists for discrete inputs in NDSolve

I'm currently trying to simulate a step response in a simple tank system with NDSolve. I would like it to start at say time 2 (the precise time is not important). ...
132 views

### How to properly apply NumericQ or s.th. similar here? - NDSolve inside NMaximize

I wrote a function that numerically solves a given Schrodinger equation and returns replacement rules to obtain the time evolution operator. It looks and is used as follows: ...
405 views

### Grid - problem with ItemSize being ignored

Bug introduced in 7.0 or earlier and persisting through 10.0.2 or later I have run into another problem with Grid today. An explicitly specified ...
64 views

### How to put a fixed sized frame around traditional form expression

The height of a 2D form of a polynomial changes depending on the existence of exponents, fractional coefficients, etc. For use inside a Manipulate, I would like to ...
26 views

### why i cannot get appropriate number with my custom precision? [duplicate]

why i cannot get appropriate number with my custom precision? In[25]:= N[(1 + Exp[-30])/(1 + Exp[-29.9]), 1000] Out[25]= 1. I expect to see a few digits after ...
104 views

### How to avoid complex terms in the results given by Integrate?

As shown by In1, integrating Sqrt[x^2 - 1]/(a + x^2) (1/x) returns a result with a complex terms; however, after I make a ...
121 views

### How to make $a1**a2** \cdots **an=0$ for a given $n$?

In order to optimize my computation and save memory, I'd like to modify NonCommutativeMultiply so that for a given $n$ one has $a1**a2** \cdots **an=0$ for any $a1, a2, \ldots, an$. To make it ...
143 views

### Unknown option PlotJoined->True [closed]

I am learning Mathematica (10.0) and tried the following code: ...
70 views

### How can I change variable passed to a function? [duplicate]

Sometimes I'd like to make a function, which would take an argument "by reference" instead of usual "by value". This is semantically similar to what e.g. AppendTo ...
105 views

### RegionPlot fails when given function with internally redefined variables

I've just upgraded to v10, and have noticed that some of my trusty old notebooks which used RegionPlot now fail to run. I've boiled down the problem I'm having to ...
96 views

### Prevent a sum from simplifying? [duplicate]

Basically, I want to prevent a sum from cancelling or summing together the individual summands and just display them separately next to each other. Example: ...
62 views

### For Loop in Mathematica {n, factored form of x^(n)-1} for 95<=n<=105

I am new to mathematica. I am trying to write a for loop to print out {n, factored form of x^(n)-1} for 95<=n<=105. I have followed the directions of another for loop, and gotten the following ...