# All Questions

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### Plot a sum of vectors using inline free format or wolframalpha. What is the hidden code?

Using Wolframalpha or inline free format you can obtain a nice representation of a sum of vectors. An example is shown below. Whish is the hidden code? (or a code that make the same representation). ...
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### Nonlinear Difference Equations

How can I plot the nonlinear difference equations? I try to use the continuous code but I do not know if its work with difference StreamPlot[{x+ .01 (0.4(x^3) - .2 (y^2)x + 1.1 (y^3) y+.01(-9x^3+9xy^...
7 views

### Export styled grid to latex

I'd like to write a ExportString for Grid and/or TextGrid with basic style elements into Latex tables. I would it at least ...
14 views

### expansion of hypergeometric series

I am completely new to mathematica. I am not sure how to calculate the expression 2F1. Is it possible to a closed form solution in terms of z of the hypergeometric series 2F1(-a, N/2-a, N/2; z) and ...
13 views

### Easiest way to export amplitude from FeynArts to FeynCalc

I am having trouble calculating some unpolarized squared amplitudes with FeynArts+FormCalc and want to use FeynCalc to manually handle the amplitudes calculated by FeynArts. What is the easiest way to ...
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### A doubt on ParametricPlot3D, RevolutionPlot3D, ListPlots and NIntegrate: can I build an “RevolutionListPlot3D”?

First of all: this is question lies in the context of Surfaces and Embbedings on differential geometry. More precisely in the context of Kruskal coordinates and how to plot a 3D dynamical ...
43 views

### Turn vector equation into matrix multiplication

I have physical equations of motion that describe the dependence of one vector field on the components of another vector field. Without getting too much into detail, my differential equations involve ...
133 views

### To hatch bar in BarChart

I have this code: ...
62 views

### What does the {-y,x} in this equation mean? [closed]

What does the {-y,x} in this equation mean? .5 {-y,x}/(x^2+y^2)