# All Questions

58,666 questions
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 ...
66 views

### 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 ...
31 views

### What does orthogonall mean? [closed]

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 ...
108 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, ...
56 views

### Nested Do loops with externally defined iterators

I want to be able to define a set of iterators for nested Do loops, such as ...
66 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 $k$ ...
113 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: <...
143 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
37 views

### 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 ...