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Mathematica : Recent Questions and Answers (Page 192)

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

Can one force TimeSeries to add instead of average values with identical timestamps?

I have a list of time-value pairs of the form {{t1,v1},{t2,v2},{t3,v3},...} that I'd like to turn into a TimeSeries object. The problem is, some of the time values are identical,...

Asked on 01/14/2021

1 answer

GeoGraphics Day/Night way off

I've been struggling to figure out the correct GeoGraphics options to get the desired results. Here's what I have so far and the results that I'm getting: ...

Asked on 01/14/2021

1 answer

Columned text not showing up in Manipulate plot variable label

I can't figure out why my columned text in the variables of my Manipulate plot are not showing up. In the labels for the variables, I set columns but only...

Asked on 01/13/2021 by Ashna Reddy

1 answer

CUDA Real_t data type yield wrong result

I'm working on writing CUDA code on MMA, because I found that CUDA on MMA can reach the max precision from this webpage. When I run the...

Asked on 01/13/2021 by PalvinWang

1 answer

Mesh Generation help

I am having trouble generating a mesh of a rectangle inside another rectangle. I have been following the steps on this article: https://reference.wolfram.com/language/PDEModels/tutorial/HeatTransfer/ModelCollection/ShrinkFitting.html However, I have been...

Asked on 01/13/2021 by kmulc

2 answer

Solving a simple differential equation and trying to plot the trace of the solutions

I am trying to run a simple code on Mathematica. However, it is not running for some reason. What mistake am I making?ClearAll {x, y, z, t, X, Y,...

Asked on 01/13/2021 by freebird

2 answer

Why is there no heat being transfered in my program?

I have been working on this code and am new to this coding language. I have been trying to model the transfer of heat through a hot plastic being cooled...

Asked on 01/13/2021

0 answer

How to fix EdgeWeights when a vertex is deleted from a directed graph (BUG?)

I have the following Codes (developed by @Mr.Wizard and @kglr, respectively):multiplierB[M_?MatrixQ, sec_Integer] := ((#/Tr[#] & /@ N[M[Transpose]])[Transpose] // Take[#, sec, sec] & // Inverse[IdentityMatrix[sec] - #] &);UnweightedTransmission[matrixA_?MatrixQ,matrixB_?MatrixQ,t1_Real, ...

Asked on 01/13/2021

0 answer

Generate an example of a random planar network using MeshConnectivityGraph and DelaunayMesh

I have seen other people run the following code:MeshConnectivityGraph[DelaunayMesh[RandomPoint[Disk[], 1000]]]To generate a planar network (working towards creating a model of larger human networks). I can't get Mathematica to execute...

Asked on 01/13/2021 by Caitlin

1 answer

When numbers plugged in - this expression evaluates to zero, but otherwise will not evaluate to zero

I have the following code:COV1 = {{a1,0},{0,a2}}; COV2 = {{b1,0},{0,b2}};T = MatrixPower[MatrixPower[COV1,1/2],-1]*MatrixPower[MatrixPower[COV1,1/2]*COV2*MatrixPower[COV1,1/2],1/2]*MatrixPower[MatrixPower[COV1,1/2],-1];Thalf = 1/2*{{1,0},{0,1}} + 1/2*T;COV3 = Thalf*COV1*Transpose[Thalf]+{{0,t},{t,0}}d1 = Sqrt[Tr[COV1 + COV2 - 2*MatrixPower[MatrixPower[COV1,1/2]*COV2*MatrixPower[COV1,1/2],1/2]]]d2 =Sqrt[Tr[COV1 + COV3 - 2*MatrixPower[MatrixPower[COV1,1/2]*COV3*MatrixPower[COV1,1/2],1/2]]]*2Simplify[d2...

Asked on 01/12/2021

1 answer

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