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Mathematica : Recent Questions and Answers (Page 186)

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

Heatmap, visualizing on negative/positive values with Cartography

I want to create a heatmap in relation with a CityMap. A example of my dataset is:data = {{GeoPosition[{52.4221, 4.79205}], 0.000972465}, {GeoPosition[{52.4264, 4.84578}], 0.0010099}, {GeoPosition[{52.4177,...

Asked on 01/21/2021

1 answer

Last part of a url (after the "/")

I want the last number after the "/". How can I do that?"http://arxiv.org/abs/math/0208009v1"I just want 0208009v1 I want to import multiple links from the following:{{"http://arxiv.org/abs/math/0208009v1"}, {"http://arxiv.org/abs/0905.0227v1"}, {"http://arxiv.org/abs/0907.5143v2"}, {"http://arxiv.org/abs/math/0509348v1"},...

Asked on 01/21/2021 by Aryan

2 answer

Radial PolarTicks skewed when aspect ratio is not 1

In the following plots, the radial axis phi == 30 Degree has a single tick at r == 1/2. This tick is skewed (i.e. does not cross the radial axis orthogonally)...

Asked on 01/21/2021 by yawnoc

1 answer

How to compute the trace distance of a density matrix

I am trying to compute the trace distance of two general $4 times 4$ density matrices as such: $D=frac{1}{2} , mathrm{tr} , |Deltarho|_1$ where $Deltarho$ is the...

Asked on 01/21/2021

1 answer

Slider for different plots

Hi I've got 12 different plots and I want to be able to cycle through them with a slider, however, none of the options for manipulate or slider seem to...

Asked on 01/20/2021 by Neil Mehta

4 answer

NDSolve involves previous time step value

I am trying to use NDSolve to solve problems involve previous time step value. For example, instead of using the working code below: NDSolve[{x'[t] == a[t]...

Asked on 01/20/2021 by VTeh

1 answer

grouping common powers of Bose operators

I compute a product of Bose operators and turn it into normal ordering using Boson commutation relations, e.g:c1 * SuperDagger[a] ** SuperDagger[a] ** a ** a + c2...

Asked on 01/20/2021

1 answer

How to deal with this problem of abstract matrix

First question: Let A and B be n-order square matrices, and r(X) denote the rank of matrix X (r(X,Y) is the rank of the augmented matrix composed of X and...

Asked on 01/20/2021

0 answer

Double Sum Computation Issue

I'm trying to compute a double sum... For scalars, it seems to be working fine. Here is an example: Sum[ρ^(h - 1)/ Sum[ρ^x, {x, 0, h - 1}], {h,...

Asked on 01/20/2021 by PiE

1 answer

Why is this integral throwing a "MemoryAllocationFailure" error?

The following call to NIntegrate throws the error:Throw::sysexc: Uncaught SystemException returned to top level. Can be caught with Catch[[Ellipsis], _SystemException].and returns SystemException["MemoryAllocationFailure"] as output.NIntegrate[ PolyLog[-3, -E^(-(Sqrt[a (k^2 + 1)]...

Asked on 01/20/2021

1 answer

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