# All Questions

120 views

### Combination of linear programming with bilevel optimization

I'm not a programmer really (interested in mathematics actually). Excuse me if I can not coding good. I'm also interested in implementation of mathematics results in programming language. That's my ...
222 views

### Assign the contents of a “Copy” operation programmatically to a variable?

While an earlier question Cut and paste data from a spreadsheet nominally addresses the issue, a year has past since its OP asked it and I hope that others have come across simpler or more direct ...
96 views

### NMaximize and Accuracy

I have a problem with NMaximize which is best depicted by the following figure. The result indicates, that the solution mathematica finds seems to be smooth except a few outliers. How can I get rid of ...
207 views

### Converting code in other languages to Mathematica code

Do you know of any work being done on the idea of bringing in code from languages like PERL, PHP, Python, etc.? That is import the code in some way and then convert it to Mathematica code?
100 views

### Signed Graph from positive and negative correlations

I want to create a signed graph where the edges of my graph are either green (for a positive correlation) or red (for a negative correlation). I only managed to create a graph from a tresholded ...
162 views

### Is it possible to monitor the sum of squared errors in a NonlinearModelFit or FindFit procedure during the process?

Since fitting procedures using NonlinearModelFit (or `FindFit) sometimes take very long, I would like to monitor the sum of squared errors during the process ...
188 views

### Large scale linear programming (Data imported from .mat file)

I tried to run a large scale linear programming with mathematica. I entered the code below: ...
195 views

### 2D Markov Process

I have a homework project. I need to analyse a gambler's ruin where there are 6 possible outcomes of every wager with corresponding probabilities and payoffs and the gambler may vary the wager (say ...
152 views

### Applying a general formula

We are a group of students who are struggling with transforming this formula to run in mathematica. In fact there are many formulas that we are struggling with, but if we are able to see how this is ...
117 views

### How to Override the Head of a Symbol

I was wondering if it is possible to override the head of symbols/operators. As a motivating example if I run: Then Ket will be returned. But lets say I want Bob to be returned instead of Ket. Is ...
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237 views

### Does Mathematica compute free-form-input on Wolfram servers?

I've just started to use Mathematica and I'm using the free-form input a lot. The computation time for simple problems seems to take a lot of time and my CPU isn't really used at all. I first thought ...
121 views

### Difficult parametric function

I've got this strange parametric function and I want to implement it on Mathematica. I know that I could use Excel and calculate it, but my database is quite large and I want to do some reproducible ...
111 views

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### StreamPlot Label for General Parameter

I have a simple DEQ: $$y'(t) = y + C$$ for a constant $C$. It turns out that the equilibrium point of this DEQ is $-C$. I can use the StreamPlot command to plot ...
523 views

### Generating social network graph from a CSV file

I am new to Mathematica and wanted to generate undirected graph for data sets that show the relationships of organizations with each other. The data is in a square matrix. The cells of the matrix ...
209 views

### Sorting lists element by element [duplicate]

I have a problem regarding list sorting. Let's say I have a list of lists obtained using Subsets[], of the form ...
257 views

### Generating a random tree of given cardinality, depth, and labeling

For demo, exploration and teaching purposes, I would like to be able (and asking you for help) to generate these special instances of trees: For given: N - number of nodes in the tree D - depth of ...
238 views

### Combining Newtonian 3D N-Body Simulation Output and Earth Sphere

I'm trying to figure out how to make a simulation whereby two satellites orbit Earth, but have run into a little bit of a snag. I have a solution to the system of ODEs for the n-body output, and I ...
113 views

### How to normalise a line in mathematica

I'm working on creating a line plot from a histogram, as in the following: ...
87 views

### Export notebook to HTML produces low resolution GIF

I have equations written in my notebooks as text (the cells set as Format -> Style -> Text). When exporting the notebook to HTML (File -> Save As.. -> HTML) with the GIF option (the default) an HTML ...
346 views

### How to efficiently mask an image?

I want to extract/cut out a part of an image. Since my mask is not rectangular I want to set pixels that are not masked to zero (black). My current approach is something like this: ...
468 views

### Draw grid lines at multiples of k

Here is a beginner's question: when creating plots with mathematica, I want the grid lines to be at multiples of a constant value. E.g. in the following plot, the vertical grid lines are at multiple ...
148 views

### Extract the generating curves from a Graphics3d returned from RevolutionPlot3D

I have a plot g = RevolutionPlot3D[{Sin[t], t}, {t, 0, π}, {θ, -π, π + 3 π/4}]; Is it possible to extract the generatrices (generating curves) from ...