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Mathematica : Recent Questions and Answers (Page 75)

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

Is this a bug in Total?

The output from the last of these lines doesn't make sense to meTotal[{}, {1}]Total[{}, {1, 2}]Total[{{1}, {1, 1}}, {2}]Total[{}, {2}]00{1, 2}0The 3 first correctly sums at...

Asked on 06/17/2021 by MeMyselfI

1 answer

Getting two different results for the same computation

I have the following two codes:In[1]:=f = 10^5;u = 1;m = (R1 + R3)/(c*R1*R3);R1 = 100;R3 = 100;n = 100;k = c*R1;c = 100*10^(-9);FullSimplify[ f*Integrate[(Integrate[(((((u*Sin[2*Pi*f*x])*Sign[u*Sin[2*Pi*f*x]])/ ...

Asked on 06/17/2021

1 answer

Determining occurrence of a sequence of numbers in the first 50,000 primes

I have to determine how many of the first 50,000 prime numbers (digits) contain the sequence 5, 4, 3, in that order. The numbers don't have to necessarily be consecutive....

Asked on 06/16/2021

4 answer

Calculate unknowns in a set of triangles

I got a problem of which I can't get mathematica to calculate. The known inputs are a=17 degree, b=12 degree and...

Asked on 06/16/2021 by Johan Grankvist

2 answer

How to filter table from some rows without flattening it?

Consider the following table:a1[x_] = If[x < 1.1, 3, Pi/2]tabb = ParallelTable[{x, y, z, a1[x]}, {x, 1, 2, 0.1}, {y, 0.5, 1, 0.1}, {z, 1, 3,...

Asked on 06/16/2021

1 answer

How to change the joining code?

I'm trying to combine 4 matrices but I'm getting a matrix of 4x16 not 8x8.A={{1,2},{2,3}};B={{2,1},{3,3}};DD={{4,5},{6,37}};EE={{12,11},{13,14}}; ...

Asked on 06/16/2021

1 answer

Startup error Part::partw

When I started mathematica, this message popped up.Part::partw: Part 5 of PacletManager`Utils`Private`$taskData[2] does not exist.Does anyone know what this is? My version is mma 11.2....

Asked on 06/16/2021 by Turgon

2 answer

PDE with Stefan Conditions, a.k.a variable boundary

I want to solve the one-dimensional one-phase Stefan problem, but I don't know how to make Mathematica understand the conditions. If you are not familiar with what I'm asking please...

Asked on 06/16/2021

2 answer

Can you dynamically display the value of the slider in Animate?

It would be nice to be able to see the value of t changing as the animation progresses even if it is updating so fast that you have to stop...

Asked on 06/16/2021 by Youvan

3 answer

Visualisation of a recursive function

Is there a way to nicely visualize recursive functions? (diagrams/plots) More specifically I'm looking for a way to make contrast (visually) between e.g. the cosine function which if continuously...

Asked on 06/16/2021 by Ellie

5 answer

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