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Mathematica : Recent Questions and Answers (Page 203)

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

How to select the fastest approach for large numerical data computations?

I really love the flexibility of Mathematica: there are several ways to perform one task. However, to get the performance of the intense numeric calculation, it can cause some confuses....

Asked on 12/28/2020 by Nam Nguyen

2 answer

BCS fit to conductance spectrum (from STS) to get the superconducting energy gap

Can someone help me fitting STS spectra using the Dynes formula (Phys. Rev. Lett. 41, 1509 (1978).) to find a superconducting gap?I try to fit using FindFit in Mathematica...

Asked on 12/28/2020

1 answer

Bizarre behaviour - Span will speed up 1000-fold when passed input containing bad indices

(apologies for length but you can jump to a statement of the essential problem below) UPDATE:The data set is too large to paste. However, I have shown below how...

Asked on 12/28/2020 by RobertNathaniel

1 answer

Finding the similarity transformation between two matrices

I have difficulty in finding the transformation matrix of two similar matrices. It is known that matrix $A=left(begin{array}{ccc}-2 & -2 & 12 & x & -20...

Asked on 12/28/2020

2 answer

Principal Value in NIntegrate. Integrand with multiple poles

I want to evaluate the numerical integral:I1[y_] := NIntegrate[PolyGamma[(3*((0.61^2) - x (1 - x)*(y)^2))/(4*0.001) + 1], {x, 0, 1}]The plot of the function defined by the integral above is:...

Asked on 12/28/2020 by Victor Alencar

1 answer

Conditional contour plot

I want to plot implicit plots in certain regions. For example plot the section of the hyperbola that is in between the wedge. But I could not find out how...

Asked on 12/28/2020 by grdgfgr

2 answer

Regions for numerically defined Toroidal surfaces

I have data like this:DataVisualizationPlot = ListPointPlot3D[data] And would like to obtain the representing surface like this:surfacefunc = BSplineFunction[data,...

Asked on 12/28/2020 by Mr Puh

3 answer

Speed up linear programming computation?

Consider setting up the following system for a linear programming optimizationsz = 50;d = Table[Abs[i - j], {i, 1, sz}, {j, 1, sz}];vd = (d // Flatten)[[2 ;;]] //...

Asked on 12/28/2020

1 answer

Dataset changes layout depending on value types

I've been looking to using datasets for the sometimes nice layout and scrolling possibilities.However I've been trying to find a way to "force" the layout when using nested tables....

Asked on 12/28/2020 by Lou

0 answer

Failure in MultinormalDistribution

My RandomVariate fails to evaluate when sampling from a multinormal distribution, any idea what's happening here? This is Mathematica 12.1 on Mac:d = 6;sigma = {{0.2456589529728737`, 0.06467112508291382`, ...

Asked on 12/27/2020

0 answer

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