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58,603 questions
63 views

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Exporting Data to NetCDF

I previously asked for help with accessing metadata in .HDR (version 4) files. I am obliged to work also with NetCDF files, with which I am only briefly acquainted. (I am aware that my question ...
107 views

Calculating the sum of the lengths and plotting all curves on the same map

I have a curve like below; ParametricPlot[ FromPolarCoordinates[{Exp[(t + 0)*0.5], t}] // Evaluate, {t, 0, Pi - 0}, PlotRange -> All] This curve rotates ...
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How can I extract blocks of 8 bits data from a plain text file?

I have a plain textfile consisting of 4M numbers (0 and 1's) from the number Pi. I would like to split this textfile into blocks of 8 bits (ie 8 characters). I know this can be done with StringTake ...
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What does orthogonall mean? [on hold]

Say I have a node in a grid that effects all other nodes "orthogonally". If a node has a value of "4", than it increases the value stored in the other orthogonal nodes next to it by "1". So If the ...
105 views

Setting Some Elements in a Matrix to zero

Assuming I have the a 5x7 matrix below: b = ((1, 4, 9, 16, 25, 4, 2), (36, 49, 64, 81, 100, 5, 1), (121, 144, 169, 196, 225, 8, 9), (256, 289, 324, 361, 400, 9, 5), (441, 484, 529, 576, 625, ...
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Nested Do loops with externally defined iterators

I want to be able to define a set of iterators for nested Do loops, such as ...
64 views

3D Plot the result of local Minimize with varying parameter values

I'm faced with the following minimization problem: Find $r\in[0,1]$ that minimizes $\frac{d^2+k^2 (1-2r)r}{2(1-r)r}$, which is bounded by 0 and 1. In addition, $k<d$ holds and each of $d$ and $k$ ...
105 views

Option Lighting in the Show function does not work

Bug introduced in 11.2 or earlier and persisting through 11.3 There are something wrong when I try to evaluate the example from Lighting Docs, here is the code: <...
139 views

Force a sum to be simplified

I want to force this sum to be simplified to 1 Sum[Cos[(Pi*l*(2*m + 1))/(n + 1)], {l, 0, n}] Only DiscretePlot3D gives the correct result showing all point to 1
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Variable Plotted in 3d Space

I am trying to plot dose rate in 3d space in terms of r, theta and z. None of the variables are functions of each other they are just arrays of points with the following sizes: Dose 220x35 r 220x35 z ...
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If I input: ...
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Simulating ndgrid function of MATLAB

I know that there has been an answer on meshgrid function of MATLAB. For functions involving more than 3 variables, this function does not work. In MATLAB, the ...
71 views

Automatically rotate frame ticks labels

Say in ListPlot[Range[0, 1, 0.1], Frame -> True] I want the tick marks on the vertical axis to be rotated 90 degrees. How to do it automatically, preserving ...
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How to get function of “GaussianProcess” prediction?

I am a new user of Wolfram Mathematica. I need your help. Let's say I have three variables: x, y, z. I want to calculate the "z" depending on x, and y. In other words, I want to find a function for z ...
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Importing Data multiple times from the same File

I have a large data file (.txt) with bivariate data in the following form x1,y1 x2,y2 x3,y3 . . . xn,yn ---------F 0 x1, y1 x2, y2 . . . xn, yn --------F 1 . . . ...
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Elements Replacement

Please I need help on how to replace elements in a matrix with another elements. For example, I have a (5,5) matrix, and I like to replace elements from All rows and column 3 to 5, with zero. such ...
218 views

How to create “Volumemesh” from closed “surfacemesh”?

Given a surface region (MesgRegion netz2D), for example ...