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Mathematica novice here. When I compute the integralIntegrate[ Sin[x] Sin[3*x] Cos[2*y] / (Sin[x] ^2 + Cos [y]^2) , {x, 0, Pi}, {y, 0, Pi}]I receive the output$$...
Asked on 08/13/2021 by DashDotDashDot
0 answerI am trying to determine which method mathematica chooses when using FindClusters. The documentation says that it chooses the best one for the data. I have tried to use AbsoluteOptions,...
Asked on 08/13/2021
2 answerI'd like to understand how the Refine function works internally. I tried to create my own Refine function to support basic cases, my goal is not to reproduce the whole...
Asked on 08/13/2021 by BP75
2 answerHow can I take the image data of the area around a max?img = Import["https://i.stack.imgur.com/YDCGF.png"]markers = MaxDetect[GaussianFilter[img, 10], Padding -> 1]; HighlightImage[img, markers, Method -> {"DiskMarkers", 5}]...
Asked on 08/13/2021
1 answerConsider the following datadata = {{2, -2.99380668585}, {4, -2.99413053462}, {6, -2.99439488497}, {8, -2.99467836024}, {10, -2.99491958936}, {12, -2.99519218472}, {14, -2.99538900867}, {16, -2.99562768004}, {18, -2.99584876062}, {20, -2.99601713877}, {22, -2.99619549077}, {24, -2.99637350562}}I...
Asked on 08/13/2021
1 answerConsider the following list:{"END", "END", "a", "b", "END", "p", "q", "END", "t", "END"}I want to combine elements that precede the marker element "END"; I also wish to include the...
Asked on 08/12/2021 by user55405
1 answerOne can create new variable names by Symbol :In[1] Table[Symbol["x"<>ToString[i]], {i,1,5}]Out[1] {x1,x2,x3,x4,x5}But it is also possible to use ToExpression (old firend) :In[2] Table[ToExpression["x"<>ToString[i]], {i,1,5}]Out[2] ...
Asked on 08/12/2021
0 answerIs there a way to solve below $n$ simultaneous differential equations in Mathematica?$$ifrac{d}{dt}M_{n}left(tright) =bsqrt{N+3+n}M_{n+1}left(tright)+hsqrt{nleft(2N+5right)}M_{n-1}left(tright) $$I also want to plot ...
Asked on 08/12/2021
1 answerThe sample point data and codes are listed as following. The point-image tells us that the data can be divided into nine groups. However, why are they divided into two...
Asked on 08/12/2021
1 answerI'm trying to construct in xAct a metric like this where $g_{munu}$ is 4-dimentional, and $g_{MN}$ - 5-dimentional, $A_mu$...
Asked on 08/12/2021 by Arina
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