# All Questions

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### Why can't this simple differential equation be solved?

I'm trying to solve the following partial differential equation: $$f(x,y) = \partial_x^2f(x,y)-\partial_y^2f(x,y)$$ for which one obvious solution would be: $$f(x,y)=e^{2x+\sqrt{3}y}$$ An even ...
7 views

### How to make boxes independent from those cell-formatting options?

In a cell whose LanguageCategory option is True, boxes will be syntax-highlighted. Is there any way to diasble such cell-...
7 views

### How to Solve a function f[x[y],y] == 0 in Mathematica? i.e. a function of 2 variables, where one is dependent on other

I am new to Mathematica and am trying to solve an equation to calculate amplitude as a function of frequency numerically. The parameters are as follows :- ...
4 views

### Find Longest ‘A’ Path in 2D List

Write a Python application to find the longest ‘A’ path on a map of capital (uppercase) letters. The map is represented as a matrix (2-dimensional list) of capital letters. Starting from any point, ...
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### RS232 send string with quotation marks, encoded in a given page code

I managed to communicate via Wolfram Connected Devices Project, with the GDS2072A oscilloscope. The communication was made through the COM5 port, RS232. I successfully tested the connection with the ...
8 views

### Fisher distribution expressed with Chi ²

I am learning about the ANOVA test. This involves the Fisher-distribution. I know there is the ANOVA function and the ...
35 views

### How to make a 4-dimensional plot?

`The following code represents the sets of inequalities that I want to show in a region plot. It has four parameters. The acceptable range for the 4 parameters is given by:{e, 0, 10}, {Subscript[c, I],...
41 views

### Obtaining the intersections of 3-D regions using loop?

I am trying to take intersections of several three-dimensional regions by using the regionplot3d command. Currently thinking about how to use looping to take intersections for several 3-D regions. <...
32 views

### My code breaks as soon as I try to print a variable

EDIT: I think I figured out what was wrong. Since I was adding in Print[m] AFTER I ran the loop I had to clear my variables if I wanted to run the loop again. I guess my new question is, why did I ...
28 views

### Histogram of the roll of a die during “n” trials

How can I get something like this example so that on the y-axis appears the number of tests and on the x-axis a histogram with the numbers from 1 to 6. The idea is that the bars accumulate the number ...
16 views

### How do i use Streamplot to plot a non homogenous differential equation [closed]

I have the following equations: x' = x-y y' = x+y-2xy I used the following code to do the streamplot: I apologize for only having an image, as I am using Mathematica through my school servers I cannot ...
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### Problem with exporting text

I prepared in Mathematica some long text: text = string1 <> string2 <> ... <> stringn; (some strings contains TeX code). Then I would like to ...
29 views

### Label Resolution in Plot3D with MaTex

I am using MaTeX for labeling which works fine with Plot but with Plot3D the label ...
63 views

### How would I go about creating a tear drop shape of cubes in mathematica?

I am just practicing making some new designs with Mathematica and I thought of this recently. I want to make a tear drop shape (doesn't matter the orientation) constructed of mini cubes. I am ...
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### BCS fit to conductance spectrum (from STS) to get the superconducting energy gap

Can someone help me fitting STS spectra using the Dynes formula (Phys. Rev. Lett. 41, 1509 (1978).) to find a superconducting gap? I try to fit using FindFit in Mathematica but it gives several errors....
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### Extracting city names in the text form from the function CountryData

I was planning to create an array with all capital cities in Europe using the following command: CountryData["Europe", "CapitalCity"] But ...
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### WriteString to socket takes long pauses in the middle of sending a string?

I use mysock = SocketConnect[...] to connect to a socket hosted by a c++ program. Then, I send a string mystr to that socket via ...
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### Sorting a list of pairs so that the larger number in the pair appears first

Imagine I have this data. I want to sort it so that it takes the form: {{<larger>, <smaller>}, {<larger>, <smaller>}, ...}, Any help ...
74 views

### Visualisation of equipotential surface - linear charge

I am completely new in Mathematica "programming" language. At the university in Electrodynamics, we have gotten a homework to visualise the equipotential surfaces with function ContourPlot3D....
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### Marking the minimum point of a quadratic

Clear[a] Manipulate[ Plot[ a*x^2 + 2*x + a, {x, -40, 40}, PlotRange -> {-15, 15}], {a, -10, 10}] I want to mark the minimum value in this range with a blue ...
55 views

### Getting full expression of real roots using ToRadicals?

I'm solving this system of equations with Mathematica: ...
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### Assume symmetric F[a,b] = F[b,a] when CountDistinct and similar functions

I wonder how I can tell Mathematica to regard the following expressions: F[a,b] and F[b,a] as being equal, so for example ...
27 views

### Why is this PDE a Delay PDE according to Mathematica, and is there a way to solve it?

I am trying to solve a Partial Differential Equation, but NDSolve is giving me a NDSolveValue::delpde error, and I can't figure out why Mathematica sees my PDE as a ...
62 views

### plotting parabolas

I had to redo the problem because there was a mistake. With the given function from a previous problem, I was solving link, I found that the parabola created a trajectory on the graph, ie another ...
44 views

### MeshRegion automatically merges vertices that have the same position in space

I sometimes work with surface meshes that have self-intersections (immersions rather than embeddings). MeshRegion usually doesn't have any problems dealing with ...
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### Simple Question: Expand[(a + b)^2] in electrical communication research [closed]

Expand[(a + b)^2] I have two terms here, term a ...
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### How to control the decimals in MaTeX

I'm using MaTeX to display the ticks of a stream plot. However, I would like to standardize the number of decimals displayed in this plot, that is, I would like to show just one decimal. My code is ...
15 views

### Is substitution of symbolic expressions for JordanDecomposition correct?

Is it correct if I substitute letters A-Z for 25 expressions that are in a 5x5 matrix, run JordanDecomposition and then substitute expressions back? The process makes no progress after a day with ...