## Top new questions this week:

### Rocky Mountains Elevation Cutout

I was wondering whether Mathematica has the data to make a diagram showing a cutout of the Rocky Mountains, showing the elevations from San Francisco, say, to Denver, for example. Something along the ...

graphics geography
 asked by Nicholas G Score of 9
 answered by creidhne Score of 18

### NSolve uses all CPU resources

Is it default setting of NSolve that it uses all my four cores of CPU? Be aware that the following code made my computer non-respondent for about 18 seconds till it ...

equation-solving performance-tuning numerics system-performance
 asked by azerbajdzan Score of 7
 answered by Daniel Lichtblau Score of 8

### Finding the asymptotic rate of growth of a table of values

Suppose we define entropy[k] where: ...

mathematical-optimization fitting pattern-matching table patternsequence
 asked by Arbuja Score of 4
 answered by JimB Score of 3

### Strange behavior of Polygon with a hole

I observed a strange behavior using Polygon with Graphics3D in MMA14.1. Here is my example. ...

graphics3d bugs geometry polygons
 asked by qwerty Score of 4
 answered by cvgmt Score of 3

### Solving a matrix differential equation with change of variable

In order to solve $\partial_t X(t) = -i(M X(t) - X(t) M^*)$ (where * is conjugate-transpose), I wrote the following code: ...

differential-equations equation-solving matrix
 asked by phy_std Score of 4

### Coloring a function based on its monotonicity

I have a function f and I would like its graph to be colored based on its monotonicity. Specifically: Warm colors for the regions where the function is increasing, ...

plotting color
 asked by Kώστας Κούδας Score of 3
 answered by Everlin Martins Score of 2

### Finding Jacobian from Hamiltonian

Suppose I am given a Hamiltonian. How do I find the Jacobian from the Hamilton equations of motion? Here is what I have done so far: ...

differential-equations equation-solving matrix physics
 asked by codebpr Score of 3
 answered by Everlin Martins Score of 1

## Greatest hits from previous weeks:

### Where is Abbott? How to make logograms from the film "Arrival"?

The film Arrival showed Wolfram Language code in action analysing alien logograms. A recent blog describes some details and mentions a live-coding video by Christopher Wolfam. See also Stephen Wolfram'...

graphics generative-art
 asked by KennyColnago Score of 20

### 1 Plot, 2 Scale/Axis

I would like to plot those two datasets on top of each other. But they have very different range on the $y$ axis. How can I have two different axis? I found the following on the help menu but quite ...

plotting customization
 asked by 500 Score of 164
 answered by ArgentoSapiens Score of 164

### Using Export[] sends the file where?

I am trying to use the Export command to convert a list of plots into a *.gif file, and the command runs and executes well, but I can't find the file! Where is it ...

export
 asked by Patrick Da Silva Score of 49
 answered by Vitaliy Kaurov Score of 61

### Is there an open source implementation of Mathematica-the-language?

I've seen questions before such as "What is the best open-source equivalent for Mathematica?", but that specific question (and that line of inquiry in general) cares more about the computer algebra ...

programming open-source
 asked by sblom Score of 131
 answered by Simon Score of 95

### Labeling individual curves in Mathematica

I need to create a plot for export and inclusion in a report. Is there a better way to label curves than PlotLegends? From what I've read and my personal experience,...

plotting legending
 asked by Tianxiang Xiong Score of 65
 answered by Artes Score of 48

### Finding Limits in several variables

Is there a way to find a limit of a multivariable function, like $$\lim_{(x,y)\to (0,0)} f(x,y)$$ with Mathematica? When $f$ is continuous, we can use \lim_{(x,y)\to (0,0)} f(x,y)=\lim_{(x,0)\...

functions calculus-and-analysis
 asked by Dominic Michaelis Score of 34
 answered by whuber Score of 44

### xkcd-style Plots

I received an email to which I wanted to respond with a xkcd-style graph, but I couldn't manage it. Everything I drew looked perfect, and I don't have enough command over ...

plotting generative-art
 asked by Amatya Score of 644
 answered by Simon Woods Score of 508

## Can you answer these questions?

### How to derive this vector analysis equation?

How to use mathematica to derive this vector equation: \nabla \times (\mathbf{A} \times \mathbf{B}) = (\mathbf{B} \cdot \nabla) \mathbf{A} - (\mathbf{A} \cdot \nabla) \mathbf{B} + \...

simplifying-expressions vector-calculus
 asked by Toboraton Score of 1
 answered by Roland F Score of 0

### Replacement of strings within lists

i have a string list: lis = {"a",{"b","c"},"d"} ...and would like to replace "c" with "Q", to give <...

string-manipulation
 asked by Suite401 Score of 1

### Poincare section using Hamiltonian formalism

I'm trying to plot Poincaré surface of sections, using Hamiltonian formalism, for a system with 3 degrees of freedom. I have written a code for this. The code provides results for the integration of ...

differential-equations numerical-integration physics nonlinear sow-reap
 asked by MMS Score of 1
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