This makes a list with five references to the same list: data = [[None]*5]*5 Use something like this instead which creates five separate lists: >>> data = [[None]*5 for _ in range(5)] Now it does what you expect: >>> data[0][0] = ‘Cell A1’ >>> print data [[‘Cell A1’, None, None, None, None], [None, None, None, … Read more
Check scipy.stats.mode() (inspired by @tom10’s comment): import numpy as np from scipy import stats a = np.array([[1, 3, 4, 2, 2, 7], [5, 2, 2, 1, 4, 1], [3, 3, 2, 2, 1, 1]]) m = stats.mode(a) print(m) Output: ModeResult(mode=array([[1, 3, 2, 2, 1, 1]]), count=array([[1, 2, 2, 2, 1, 2]])) As you can see, … Read more
I’ve written for my project the following function; it receives an THREE.Object3D instance and a camera as a parameters and returns the position on the screen. function toScreenPosition(obj, camera) { var vector = new THREE.Vector3(); var widthHalf = 0.5*renderer.context.canvas.width; var heightHalf = 0.5*renderer.context.canvas.height; obj.updateMatrixWorld(); vector.setFromMatrixPosition(obj.matrixWorld); vector.project(camera); vector.x = ( vector.x * widthHalf ) + widthHalf; … Read more
There are more approaches for image to ASCII art conversion which are mostly based on using mono-spaced fonts. For simplicity, I stick only to basics: Pixel/area intensity based (shading) This approach handles each pixel of an area of pixels as a single dot. The idea is to compute the average gray scale intensity of this … Read more
Just to amplify Joel’s points a bit: This goes much easier if you allocate your arrays so that they’re contiguous (something C’s “multidimensional arrays” don’t give you automatically:) int **alloc_2d_int(int rows, int cols) { int *data = (int *)malloc(rows*cols*sizeof(int)); int **array= (int **)malloc(rows*sizeof(int*)); for (int i=0; i<rows; i++) array[i] = &(data[cols*i]); return array; } /*…*/ … Read more
Background map Ok I created a test RGBA map as 2 images one containing RGB (on the left) and second with the alpha channel (on the right) so you can see them both. Of coarse they are combined to form single RGBA texture. I blurred them both a bit to obtain better visual effects on … Read more
pygame.Surface.scroll() doesn’t do what you expect. It doesn’t seamless roll the surface. See the documentation: scroll() Shift the surface image in place […] Areas of the surface that are not overwritten retain their original pixel values. […] You’ve to write your own scroll functions, which place the part of the surface, which was shifted out, … Read more
Here is the standard method, AFAIK. Basically sum the cross products around each vertex. Much simpler than triangulation. Python code, given a polygon represented as a list of (x,y) vertex coordinates, implicitly wrapping around from the last vertex to the first: def area(p): return 0.5 * abs(sum(x0*y1 – x1*y0 for ((x0, y0), (x1, y1)) in … Read more
The Mercator map projection is a special limiting case of the Lambert Conic Conformal map projection with the equator as the single standard parallel. All other parallels of latitude are straight lines and the meridians are also straight lines at right angles to the equator, equally spaced. It is the basis for the transverse and … Read more
Your code is wrong at *arr[i]=(int*)malloc(m*sizeof(int)); because the precedence of the [] operator is higher than the * deference operator: In the expression *arr[i], first arr[i] is evaluated then * is applied. What you need is the reverse (dereference arr, then apply []). Use parentheses like this: (*arr)[i] to override operator precedence. Now, your code … Read more