# All Questions

207 views

### What Mathematica purchase level does CDF creation and deployment come with?

I am evaluating which purchase level of Mathematica 9 will suit my needs. I am finding some of the information provided on Mathematica's How to Buy Chart a bit vague and unclear. I need to be able to ...
238 views

### ParametricPlot3D doesn't appear

Here I have one simple system solvable with NDSolve. I don't know why ParametricPlot3D doesn't present trajectory in space. I have solutions for x[t], y[t] and z[t] ...
253 views

### Cannot Get Numerical Results to Match

I try this numerical summation (in two parts) ...
105 views

### Can't see updating performed by NMinimize[…,StepMonitor->(…)] outside of Button in which it's called [duplicate]

I've made a peak-fitting GUI in which I have a "Fit" button that, when pressed, calls NMinimize[...,StepMonitor->(step++)] to minimize a sum of squared ...
153 views

### Manipulate not accepting default values

I have pasted my Mathematica code below. For some reason, the default value for h, or Δx, while set to 4.5 in the code, keeps displaying at -4 instead. I have been over and over this example, and I ...
170 views

### Generating replacement rules programatically

I would like to generate sets of replacement rules programatically for predefining some permutations. So a function ...
182 views

### Showing steps Mathematica uses for Resolve[ForAll[…]] [duplicate]

I have a quite complicated function of 2 variables: ...
177 views

### How do I evaluate the terms in an expression, but not the expression itself?

I am trying to write a set of homework questions. I would like the output to evaluate the constants but not the sum, so that I may present the homework question as something like this: ...
94 views

### Possible to use Manipulate in GUIRunModal?

Is it possible to use the widget created by Manipulate within GUIRunModal? I intend to run the file using ...
281 views

### Why does my matrix lose rank?

I want to check the rank of a matrix for observability, but Mathematica loses a rank if the matrix contains very large numbers. Let's say my matrix is ...
287 views

### How do I add a color bar to a 3D plot?

I tried Plot3D[Exp[-x^2 - y^2], {x, -2, 2}, {y, -2, 2}, ColorFunction -> (ColorData["TemperatureMap"][#3] &), PlotLegends -> Automatic] in an attempt ...
314 views

### Applying l'Hôpital's Rule to NDSolve with Piecewise Function

OK, so I've been working on this problem for over a week and it's driving me crazy. I'm trying to solve a system of two differential equations in $x(t)$ and $y(t)$ using a "time-elimination method," ...
166 views

### Use of Manipulate in CDF documents

I am trying to publish a cdf document, but I'm having some problems with the function Manipulate with this code: ...
114 views

### Dynamically show a specific number of the fractional part's digits

What is the fastest way to cut off all n z digits of the fractional part of a real number? (For example 12390.20934230) I came up with this so far: ...
40 views

### Plot3D has a break in the center of the plot [duplicate]

I am trying to plot a relationship using Plot3D and for a reason I cannot figure out the function is not evaluated in the middle of my range. If I take a 2D slice ...
123 views

### Why Solve and Simplify give different results? [closed]

I want to solve the following equation y == (1/(1/4 + y) - 1/(3/4 - y))/((1/4 + y) + 1/(3/4 - y)) I tried ...
495 views

### Changing line thickness without changing line length

Is there any way to change the thickness of line without changing the width? For instance, the following example shows that as thickness increases, the white gap decreases. Is there any way to ...
162 views

### Construct file names using a number and a string prefix [duplicate]

I'm trying to append filenames with Mathematica, and cannot do it. The output of my calculation are two lists : X and Y, ...
146 views

### Manipulate for probability distribution with multiple parameters, kernel smoothing

I'm looking to use the Manipulate command to take a distribution with multiple parameters (e.g., mean and sigma for the normal), generate some variates, then plot ...
110 views

### CommunityGraphPlot doesn't size

When I need to plot a 'large' graph with CommunityGraphPlot the output is always sized at the Mathematica default value. The Graph object itself can be resized with ImageSize option. However that ...
165 views

### Text Annotation Disappears in Wrapped 3D Graphics

In a 3D graphic, if I wrap a figure, for example, ...
106 views

### How can I highlight the vanishing-partials in an interactive 3D plot?

I am using Manipulate and Plot3D to plot a function with two real variables and two extra parameters. ...
186 views

### Time range selector à la InteractiveTradingChart

I have time series data and I would like to interactively select a part of it. This problem is beautifully solved in the lower part of the InteractiveTradingChart command: I would like to be able ...
3k views

### How to use a 3×3 covariance matrix to plot an error ellipsoid?

I have a 3×3 error covariance in Mathematica, but I don't know how to use it for plotting the error ellipsoid. It would be great if you can show me how I can do that for the below covariance matrix: ...
112 views

### Using With in combination with Graphics [duplicate]

Assume that we are given a symbol p={x,y} which should represent a 2D point. If x and y have ...
375 views

### Exporting a Video of a Simulation of Pendulum Motion

In a series of previous questions, I asked how to solve a series of differential equations describing a series of coupled pendulums, and then how to plot this data by coloring the different pendulums. ...
401 views

### Save variables values and definition

I used to do a lot of programming in R and recently switched to Mathematica. One thing that bothers me is that I haven't found a way to save variables, their values and definition! Let's look at an ...
64 views

### Plot not displaying [duplicate]

I'm trying to perform a basic plot to show that two equations align, but I'm not getting any results. Plot[{[Pi]*Cos (3 x - [Pi]), [Pi] * Sin (3*[Pi] - 3 x)}, {x, -3 [Pi], 3 [Pi]}] To me this seems ...