# All Questions

61,697 questions
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### InstallR[] failing in Mathematica 12

I was trying to use R with Mathematica 12 tried these three commands, Needs["RLink"] InstallR["RHomeLocation" -> "C:\Program Files\R\R-3.5.1", "Rversion" ->"3.5"] I am getting this error JLink'...
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### Warning: “{number} is too small to represent as a normalized machine number" and SetPrecision

I have the following summations: The code: ...
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### How to use the roots of equations

Can anyone explain to me how can I use the roots of an equation? Let clarify my question with one example. Suppose that I have an equation which I want to find its root: ...
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### Could this problem be tackled using Mathematica?

I posted this question on Math, but there has been silence there since. So, I wonder if anyone here can get any closer to the answer to my question using Mathematica. Here is the question: Suppose I ...
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### How to differentiate a function constructed through FindRoot?

I am trying to maximize a function which has as a variable another function that was solved numerically using FindRoot. My code is below.I start by defining some parameters ...
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### How to use Manipulate for protein sequence alignment?

so I have the sequence of a protein from Chain A and Chain B and I want to use manipulate to show what parts of sequence are identical.
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### Variable dimensional integrals

I need to Integrate a function, but let the number of dimensions vary. Integrate[Product[Exp[-( t[[i]] )^2], {i,1,4}], options] ...
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### Combine points in 3D space by ListPointPlot3D

I have a array and I want to plot it in 3d space by ListPointPlot3D function. ...
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### help me, find my error [on hold]

eq[i_]:={D[u[i][x],x]+(V[i+1][x]-V[i-1][x])/(2 dy)==0,[Rho][i]( u[i]x +V[i]x/(2dy))==(([Mu][i+1]+[Mu][i])(u[i+1][x]-u[i][x])-([Mu][i]+[Mu][i-1])(u[i][x]-u[i-1][x]))/(2(dy)^2 ),u[i][x]D[[Phi][i][x],x]+...
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### InterpolatingFunction in NSolve

I'm trying to get NSolve to solve a simple system of equations. It makes use of various interpolating functions (for thermodynamic properties). I can solve the system outside of NSolve by ordering the ...
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### How to delete duplicates in the following example?

COnsider a list table = {{x1,y1,z1,t1},{x2,y2,z2,t2},...} How to remove duplicates having the same values of {y,z} (say, {1,2,3,5},{99,2,3,9})? It is not ...
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### The function VertexContract does not work in specific case

I am using the function VertexContract and I am experiencing that it does not work in some specific cases. If I give the graph with EdgeWeights, EdgeLabels and VertexLabels, I cannot contract {2,5} ...
dat1krafull = {{1., 2.61594*^-8}, {10., 7.10017*^-9}, {50., 2.1565*^-9}, {75., 1.6567...