# All Questions

183 views

### Mathematica cannot find the c compiler

I installed Microsoft Windows SDK for Windows 7 and .NET Framework 3.5 SP1 Then, I installed Mathematica 10 trial version. I did: ...
2k views

### 2D random walk within a bounded area

I want to simulate a random walk on two dimension in a bounded area such as a square or circle. I am thinking of using If statement to define a boundary. Is there a ...
80 views

### Store matched variables

Edit: I am matching and replacing a particular expression. At the same time... I want to store matched variables for later use. I got it to work with messed up code involving ...
371 views

206 views

### Triangle that collapse cells

I'm not very good in English , so is hard to explain but how put the triangle in the left that deploy or collapse a group of cells ?
195 views

### How to build a list of constraints for NMinimize

Let's say I have aset = {-1, 0, 2}. I would like to create a variable Var that takes values from that set, i.e. ...
340 views

### How to display operations on list elements

When applying some arithmetic operation on two lists, I'd like to display the actual operations between the elements of each list. For example, {1, 1} + {1, -1} ...
71 views

### Determining the total illumination of a polygon

Is it possible to determine the total illumination of a particular polygon with the given light sources? I truly acknowledge that Mathematica is not supposed to do this modeling, but it is what ...
139 views

### Problem with FTP import in V10

Mathematica V10 returns an error when download directory. URLFetch :: invhttp: "FTP: could not retrieve (RETR failed) the specified file." V9 successfully retrieves the same reference. This ...
276 views

### How can I add a tangent arrow at a certain point of a curve in a LogPlot?

How can I add an arrow at a certain point of a curve with the direction of the arrow tangential to that point? (Line are not straight in a log-plot.) ...
71 views

### SpeechNavigation option. What is it for?

Could somebody please explain what is the use for SpeechNavigation option found in the option inspector?
244 views

### Issue in ParallelTable after evaluating another function using NDSolve and FindRoot. What is wrong with this inverse?

I am trying to find the inverse of a function which is defined through NDSolve and NIntegrate. The question is pretty similar ...
425 views

### Plotting Semi-hollow spheres [duplicate]

I wish to create a nice data representation of three nested spherical sections, with a cut away so they can be viewed. As a MWE, something like; ...
236 views

### Extending a ternary plot to a tetrahedron (using ListPlot)

I have been making ternary plots of data that is a list of sets of 3 numbers, where the numbers in each set sum to one (call this "DATA"). To do this, I first transform DATA onto the 2D surface with ...
33 views

### How to prevent function from substituting the part of the parameter name if it has a subscript? [duplicate]

I have the following problem, when defining and using a function, that's supposed to have an outside parameter xmin: A[x_] := Exp[-x/Subscript[x, min]] A[5] ...
107 views

### Already solved DE, now I need to rearrange and plot

I have solved for $z(w,x,y)$ in a differential equation: $$3\frac{\partial z}{\partial y} = 2(z-1) + (1-wy^2 )x$$ And I obtained the general solution: $z = f(w,x,y)$ Now putting in $x=0$, we have ...
545 views

### Styling of logarithmic tick marks in Mathematica 10

I'm trying to plot a graph wit a logarithmic y-axis. Since I'm exporting the graph to pdf and later printing it, I want to manually set the frame and tick marks to a reasonable thickness. However the ...
310 views

### Make a scatter plot

Considering I have weather data for last 10 years for London, how can I make a scatter plot that will show the previous day's temperature as a function from today's temperature?
237 views

### Finding average error of the data

Considering I have some data, and I want to fit the data to a linear fit and find the average error from the linear fit, how can I do that using Mathematica? I have ...
87 views

### How can my Manipulate be aware of a local variable inside a nested Module

I have 3 sets of 5 x-y points: RandomInteger[10, {3, 5, 2}] I want to display only one set of points at a time, and use a slider to move on to show the next ...
107 views

### FullSimplify ratio of two gamma functions

I have the following input m = 2; Gamma[n + m]/Gamma[n + 1]; FullSimplify[%] It gives me 1+n For ...
563 views

### How to solve fluid flow problem based on Navier-Stokes equations?

Does anyone know or can provide any examples how fluid flow problem can be formulated and solved in Wolfram Language? Simplest cases of 1D or 2D flows based on Navier-Stokes equations or even their ...
115 views

### Improving the speed/efficiency of multiple (finite range) convolutions for a causal response plot

So I am looking at modelling the response of a system that is excited by multiple pulses over a period of time. The way to find the response at time t is to take the convolution between the impulse ...
69 views

### how to use Tooltip with a Dynamic point

consider this example: ...
148 views

### Random reals according to conditions

I'd like to create a list of triplets $(x,y,z)$ which satisfy the following properties: $$0<x<1/2 \\ 0<y<1/2-x \\ -1<z<-2(x+y)$$ Basically I would like to uniformly generate random ...
117 views

### How to “merge” various graphics 2d into one 3d graphic? [duplicate]

I did some calculations and as result got a 2D graphic, but at the beginning of the work I used a constant parameter. What I want is to make a 3D graphic with this parameter as an axis, varying from 1 ...