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I coded a compact toolbar in its own file nbtaskmate.nb for various common notebook tasks which I would like to load onto any notebook I might have open with a...
Asked on 12/12/2020
1 answerI have $f(x,y,z)=0$ and $g(x,y,z)=0$. I want to exclude parameter $z$ and extract a line $x(y)$. I tried contourplot3D but then I need to map intersection...
Asked on 12/12/2020 by Alexander Nikolaenko
2 answerI tried to make the old code you suggested me a little faster by doing this changes:Needs["JLink`"]Scanner[archivo_String, palabra_String] := JavaBlock@ Module[{entrada, linea, numlinea, contiene, ruta}, numlinea =...
Asked on 12/12/2020 by Mara Luisa Amada Tercero
1 answerI wanted to write this code in such a way that I run the whole thing for each $n$, and not write a1 a2 a3 or eq1 eq2 eq3...
Asked on 12/11/2020 by Ali AlCapone
1 answerI'm pasting a code of a DE.I'm getting error. Plz suggest correction.Clear[x];r=1;eqn=x'[t]-1-r*x[t]-(x^2)[t];sol=NDSolve[{eqn,x[0]==0},x,{t,0,100}][[1]];tTicks=Range[-24,24 30,24];tGrid=Range[-60,24 30,6];ParametricPlot[Evaluate[{x[t],x'[t]}/.sol],{t,0,100},Frame->True,FrameTicks->{tTicks,Automatic},FrameTicksStyle->Directive[Red,Thick],GridLines->{tGrid,Automatic},GridLinesStyle->LightGray,FrameLabel->(Style[#,14,Bold]&/@{x,Overscript[x,"."]}),AspectRatio->1]ParametricPlot[Evaluate[{t,x[t]/.sol}],{t,0,50},Frame->True,FrameTicks->{Range[0,50,12],Automatic},FrameTicksStyle->Directive[Red,Thick],GridLines->{tGrid,Automatic},GridLinesStyle->LightGray,FrameLabel->(Style[#,14,Bold]&/@{t,x}),AspectRatio->1]I made the correction regarding the syntax error. But still no execution. The following code,Clear[x];r=1;eqn=x'[t]-1-r*x[t]-x[t]^2==0;sol=NDSolve[{eqn,x[0]==0},x,{t,0,100}][[1]];tTicks=Range[-24,24...
Asked on 12/11/2020 by Rahul Chakraborty
1 answerImagine that I have a list like:list={{{{1}}}}To access the number 1, I could do list[[1]][[1]][[1]][[1]] Of course it is very ugly but this is how I would do it...
Asked on 12/11/2020
3 answerFrom a system of PDEs where i used the following ansatz: $$theta_w(x,y) = e^{-beta_h x} f(x) e^{-beta_c y} g(y)$$. $F(x) := int f(x) , mathrm{d}x$ and ...
Asked on 12/11/2020
2 answerSo the thing is I have a SphericalPlot3D of a Potential function and I want to color it considering the image of the function. The functions are:fA[r_, θ_, ϕ_]...
Asked on 12/11/2020
1 answerIs there a way to get the equations of motion (eom) of a scalar field from a Lagrangian in a perturbed FLRW metric? I want to perturb the field as...
Asked on 12/11/2020 by kalle
0 answerWhen I write W[f_] := Integrate[f[x], {x, 0, π}] I may rightly conclude thatW[Sin] = 2, W[Cos] = 0, W[Log] = π (-1 + Log[π]) etc. But I...
Asked on 12/11/2020 by Quasar Supernova
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