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Mathematica : Recent Questions and Answers (Page 39)

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

Change the Tooltip of DistributionChart

DistributionChart automatically puts a Tooltip on the elements of the chart, which shows the Min, 25%, Median, 75% and Max of the data. I would like to add the count...

Asked on 08/08/2021

1 answer

X axis rescaling without altering the y axis

I have asked this question previously and I didn’t get a satisfactory answer. Then I posted a comment and didn’t receive any replies. So I thought to elaborate my issue....

Asked on 08/07/2021

1 answer

Error importing video

When I try and import a video:Import["video.avi", {"Frames", {50, 60, 70}}]Or using the original .mp4 codec, which I converted using VLC, gives the same result.Import: Cannot import data...

Asked on 08/07/2021

0 answer

Can Image3D be setup to make any voxel with an RGB element >1 or <0 black, or better yet clear?

I'm working with ~ 10^8 voxels which can have RGB values outside of 0 - 1. Currently I go through nested For statements with a bunch of || tests....

Asked on 08/07/2021

1 answer

Speeding up value reassignments in ParallelTable

I am solving a differential equation of two closed functions using ParallelTable. For the attached code, I thought the computation time should be approximately proportional to ltau, because the k...

Asked on 08/07/2021 by user16308

0 answer

Extracting information from Classify

I have used Mathematica's automated Classify function:class = Classify[trainlist, Method -> "NeuralNetwork", PerformanceGoal -> "Quality"];acc = ClassifierMeasurements[class, testlist];'trainlist' has 720 examples and 'testlist' has 180 examples....

Asked on 08/07/2021

0 answer

Vectors do not define a plane when constructing a RotationMatrix

The following code:RotationMatrix[{{0, 1, 0}, {0, -1, 0}}]Gives an assertion message:RotationMatrix::spln: Vectors {0,1,0} and {0,-1,0} do not define a plane.Why can I define a RotationMatrix in this way?...

Asked on 08/07/2021 by Chris Guo

2 answer

How to make substitution without getting Recursion Limit Error

So I just have a complicated expression on the form z = DiagonalMatrix[{-w'[t]^3 L''[t] (1 + w'[t]^2) - L'[t]^3 H (e^(2 H w[t]) - w'[t]) + (1 - e^(-2...

Asked on 08/07/2021

1 answer

series expansion unpredictably dividing by leading coefficient

When expanding the simple expressionexpr = y^3as a series in x, withexpand = y -> Sum[Subscript[y, j] x^j, {j, 1, 20}];The behaviour of SeriesCoefficient and Series are unpredictable,...

Asked on 08/07/2021 by Jansen

0 answer

Determining Mean Path Length

I'm interested in working out the average path length in a square. Assume at a single point within the square, photons are released in every direction. I'm interested in determining...

Asked on 08/07/2021

1 answer

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