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Mathematica : Recent Questions and Answers (Page 160)

Find answers to your questions about Mathematica or help others by answering their Mathematica questions.

How can I make a certain 2D plot?

I want to draw this elementary graph, shown below. The exact path of the blue line is not important. I want to...

Asked on 02/23/2021

2 answer

Error while plotting a function, having an integration in equation

I am trying to plot a function which also includes a definite integration but I am getting an error (invalid integration variable or limit(s)Here is the code which I...

Asked on 02/23/2021

0 answer

Issue Installing Knot Theory

I have been trying to install the Knot Theory package from the knot atlas, but have been unsuccessful. Firstly I tried the command<< KnotTheory`but received a...

Asked on 02/23/2021 by Isaac Broudy

1 answer

better ContourLabels for ContourPlot

When I use the ContourPlot I prefer to use ContourLabels rather than using the PlotLegends. However the labels are often displayed very close to the frame so it sometimes can...

Asked on 02/23/2021

2 answer

Cross-section parts of a Cube and show results graphically

I am trying to visualize a 3D section of a chopped up 1x1x1 Cube. I don't want to use the Cube[] function to draw this. (unless you think you can...

Asked on 02/23/2021 by Steve237

2 answer

Save a Derivative

I have defined the derivative of a function Derivative[1][f][x_] := Sin[x] How can I save this definition in a file? Derivatives are not included in FullDefinition[f], so Save["file.m",f] won't...

Asked on 02/23/2021 by Brett van de Sande

2 answer

Incorrect result by DSolve

For real $x$ consider the trivial equation$$|y'(x)|=-|x|.$$Since the left side is always positive and the right always negative, there is no solution.Let's tryDSolve[Abs[y'[x]]==-Abs[x], y,...

Asked on 02/22/2021

0 answer

Check if rows and columns of matrices have more than one non-zero element?

I am given a list of square matrices (with non numeric entries but abstract symbols which are assumed to take real values) and I want to write a function that...

Asked on 02/22/2021 by AG1123

2 answer

Can Mathematica evaluate vector gradients?

Can Mathematica compute vector gradients such as $$nabla lVert x rVert ^2_2 = 2x$$ $$nabla lVert Ax - b rVert = A^T (Ax - b)$$...

Asked on 02/22/2021 by qwr

0 answer

System of nonlinearly coupled PDEs

Similar to the question I asked on the Math Stackexchange (in this question), I am interested in solving a nonlinearly coupled system of PDEs. The system of PDEs look...

Asked on 02/22/2021

0 answer

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