All Questions
9
questions
0
votes
1
answer
37
views
find the largest sub matrix
the larget sub matrix with odd size
import numpy as np
array = np.array([[np.nan, 255, 255, 0, 0, 0, 0, 0, 255, np.nan],
[np.nan, 255, 255, 255, 0, 0, 0, 0, 255, np.nan],
...
1
vote
1
answer
35
views
Mapping 2d point (x,y) into grid index (row,col)
I have a particular **Grid ** for robot navigation showing as so:
I have scaled this by a factor of 10 to create my Environment. This is given in Cartesian coordinates
I would like to map a point in ...
- 21
-1
votes
1
answer
38
views
Is there a better way to declare a numpy matrix where each element [i][j] is the result of an operation between A[i] and A[j], where A is an arange?
Basically, what I need to do is this:
I have a value "n" and two different arrays "x" and "y" of arbitrary values (x,y = [a, b, c, ...])
With n, I create an arange "...
- 11
-2
votes
1
answer
964
views
Python (numpy?) - build transformation matrix from sets of source and destination points
Let's imagine I have two sets points in a 2d Euclidean system:
src = [
[722.6, 1571.4],
[832, 1466],
[419, 1482],
[1005, 2804],
<snip>
]
dst = [
[35839.65, 49808.55],
...
- 537
-1
votes
1
answer
58
views
Turn 2D matrix with indexes (tuples) to 2D Boolean matrix (in different shape) - NumPy
I’m looking for an efficient way to make index matrix to Boolean matrix, without a loop (with NumPy).
The index matrix build from tuples which represents indices. I need to build a Boolean matrix (in ...
-1
votes
1
answer
188
views
python printing in matrix 2D array
I just want to check why I can't print all the element in the matrix?
as per my knowledge this is how we write the index of this matrix
did I understand it wrongly?
the only thing that print is
...
- 45
-2
votes
1
answer
48
views
separate 3D matrix like numpy
I am converting numpy code to matlab. tensor is a 3D matrix of 6 x 2D matrices of the tensor components. This code appears to then split them back into those 6 separate 2D matrices.
gxx, gxy, gxz, ...
- 107
0
votes
1
answer
107
views
Matrix rotation in numpy python, diffrent vector's length
I want to make a 2D game in pygame, and to do so, I want to use mathematical Matrices. Tought I'm thinking right, but I got a problem. Here it is: So I make a random point and I count length of it's ...
-1
votes
1
answer
250
views
Editing every value in a numpy matrix
I have a numpy matrix which I filled with data from a *.csv-file
csv = np.genfromtxt (file,skiprows=22)
matrix = np.matrix(csv)
This is a 64x64 matrix which looks like
print matrix
[[...,...,....]
[...
- 359