Mathematica Questions, Problems & Solutions : TransWikia.com ~ Page 229

Issues Applying Selections to Hierarchical Datasets

I have a large dataset in the format below. I'm able to graph them as polygons easily enough, but am having trouble doing fine selections of the coordinates in Dataset...

Asked on 11/20/2020

1 answer

Node editor and visual programming

Node editors are all the rage especially in image processing pipelines and shader programming in game engines. For example, here's a stackoverflow question about implementing a Blender-like node editor...

Asked on 11/19/2020

1 answer

Minimizing simple function of three variables fails

I need to minimize simple function with all variables are positive integers, but the out is the same as the input. No solution Clear[α, k, β,...

Asked on 11/19/2020 by Ahmed Kamal Kassem

2 answer

Incomplete path when using NotebookDirectory[] in ver 12.1.0 and Dropbox

I just upgraded from version 11.3.0 to version 12.1.0 and I am struggling with the directory of my .nb file. Usually I start all my .nb with SetDirectory[NotebookDirectory[]]But in...

Asked on 11/18/2020 by Jonathan Urrutia

1 answer

save a mathematica expression with Root[] as Python expression?

I want to convert a Mathematica expression that uses Root[] to Python (open to using sympy if needed). The expression is:Root[-k2 k4 N0 + (B0 k2 k3 + A0...

Asked on 11/17/2020 by pythonuser

1 answer

OpenCascadeLink Viewing and Assigning Element Markers

I recently upgraded to MM 12.1 so I could use OpenCascadeLink for 3D meshing following the excellent answer to a question regarding 3D meshing: 3D Meshing Internal regions Assigning...

Asked on 11/17/2020 by Greenasnz

2 answer

Mathematica refuses to distribute a scalar through parentheses

I’m working on a problem involving Kelvin-Helmholtz instability and I’m trying to perform the linearization on Mathematica. For some reason when I get to my first order equation (ε...

Asked on 11/16/2020 by confusedandbemused

1 answer

Having Mathematica replace DOS line breaks with UNIX in files

Say I have a file named "Silly.tex" which has rn line breaks. Is there a way to get Mathematica to convert it to only have n line breaks?You can...

Asked on 11/15/2020 by Pace Nielsen

2 answer

Summing over Partitions

Imagine I have a list of integers $l={l_1,l_2,...,l_{50}}$, say, for examplel = RandomInteger[10, 50]and I want to find how many ways there are of summing numbers from that...

Asked on 11/14/2020 by sam wolfe

2 answer

Assume that the value of an integral is real

I would like to give a condition that the integral I am handling are not complexes. Consider$Assumptions=Element[a,Reals] && Element[b,Reals] && Element[t,Reals] && Element[f[t],Reals] && Element[R,Reals] && Element[Integrate[b f[t],{t,-R,R}],Reals]ep =...

Asked on 11/14/2020 by Smilia

1 answer

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