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Mathematica : Recent Questions and Answers (Page 143)

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

How to represent DiracDelta?

I need to represent δ(t-t0). The hint is: In cases involving Dirac delta functions, onemay use the regularized delta function δ(t) = ε/[π(t^2 + ε^2)] approaching δ(t) in the limit...

Asked on 03/18/2021 by Marina Nebot

1 answer

Fitting Method to generate a gaussian distribution

sample = RandomVariate[NormalDistribution[0, 1.2], {10, 4, 4}]; Tranp= Transpose /@ sample; GOEe = sample + Tranp; Eigs = Map[Eigenvalues, GOEe]; Histogram[Eigs] Findingfit = FindFit[Eigs,A*1/(s*Sqrt[2*Pi])* Exp[-(1/2)*((x - u)/s)^2], {s, u,...

Asked on 03/18/2021 by Bora

2 answer

How can I add plot legends to my list plot?

I would like to add a legend to the ListPlot defined in the code shown below. Unfortunately, adding PlotLegends -> Automatic to the plot does not work. I was wondering...

Asked on 03/17/2021

2 answer

Algebraic solution from system of symbolic equations for single variable

I have a mathematical system likeK_1 = c*h/dK_2 = b*h/cK_3 = a*h/bC = a+b+c+dh+d = W/h + b + 2aConstants: K_1, K_2, K_3, C, WSolve for: h, a,b,c,dIs it...

Asked on 03/17/2021

3 answer

Strange Behavior in Barchart LabelingFunction

Bug introduced in 10.0.0 and fixed in 10.0.1BarChart formatting algorithm make me loose some time today in V10.Now, LabelingFunction does not work beyond...

Asked on 03/17/2021 by Murta

3 answer

Not all rules being used in replacement

Result I get for the following replacement doesn't seem to be correct. {a*b*c*d*e} /. {d -> d*f, a -> a*b*c, b*c -> b*c*d*e, c*f -> c*f*g}...

Asked on 03/17/2021 by Sejwal

3 answer

Calculating the integral

The question is asked in the mathstackexchange. There is no answer. I can't solve it by hand, also.Maybe we can solve it with Mathematica....

Asked on 03/17/2021

0 answer

Plotting with a discontinuous axis using Piecewise ScalingFunctions

I'm trying to plot some data and a curvefit with a discontinuous x axis. My attempt is borrowed from this answer.data = {{100, 1400}, {7, 1180}, {5, 1060},...

Asked on 03/17/2021 by MelaGo

0 answer

How to improve the solution of the following differential equation?

Consider a PDE$$tag 1 frac{partial f_{n}}{partial t}- frac{1}{2t}Efrac{partial f_{n}}{partial E} = 0$$I choose the initial condition $f_{n}(E, t_{0}) = e^{-E/T_{0}}$, where $T_{0}$ is...

Asked on 03/17/2021

1 answer

Finding the x coordinate of a point in the solution of NDSolve from its y coordinate

Using NDSolveValue, we can know the y coordinate of the function from an x coordinate. Is it possible to do the reverse, where the input is the y coordinate...

Asked on 03/16/2021

1 answer

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