2d

Currently as a trail effect in my game I have for every 5 frames a translucent texture copy of a sprite is added to a List<> of trails. The alpha values of these trails is decremented every frame and a draw function iterates through the list and draws each texture. Once they hit 0 alpha they are removed from the List<>. The result is a nice little trail effect behind moving entities. The problem is for about 100+ entities, the frame rate begins to drop drastically. All trail textures come from the same sprite sheet so i dont think it's batching issue. I profiled the code and the CPU intensity

I'm trying to plot a 2D histogram in Python using these code from math import * import pylab as p import matplotlib.pyplot as plt import numpy as np x=part.points[:,0] y=part.points[:,1] z=part.points[:,2] H, xedges, yedges = np.histogram2d(x, y, bins=(128,128)) H.shape, xedges.shape, yedges.shape extent = [yedges[0], yedges[-1], xedges[-1], xedges[0]] plt.imshow(H, extent=extent, interpolation='nearest') plt.colorbar() plt.xlabel("x") plt.ylabel("y") plt.show() Every thing works fine: I have a color bar which represent the counts in each cells. The thing is that I would like to have the log

I want to create a dict from lower triangle of a symmetric matrix represented as 2d array. For examples if the numpy array is; array([[0, 2, 3], [2, 0, 4], [3, 4, 0]]) then I want the dict to look like; {('1', '0'): 2, ('2', '0'): 3, ('2', '1'): 4} There is a similar post for vector; Fastest way to convert a Numpy array into a sparse dictionary? I am relatively new to python so any help/suggestoins appreciated. >>> arr =[[0, 2, 3], [2, 0, 4], [3, 4, 0]] >>> dict(((j,i), arr[i][j]) for i in range(len(arr)) for j in range(len(arr[0])) if i<j) {(2, 0): 3, (1, 0): 2, (2, 1): 4} One way to do it is

I have a 3D image read in to SimpleITK (using python) from a NIfTI file, take each axial slice, do something with it and re-insert the new 2D slice into a 3D volume with the (hopefully) appropriate dimensions. For example, output = sitk.Image(original.GetSize(), sitk.sitkFloat32) output.CopyInformation(original) for z in numpy.arange(original.GetDepth()): image = original[:,:,z] << Do Something in SimpleITK>> << Produce a new 2D image = newimage >> output[:,:,z] = newimage The final step is throwing an error In [???]: (executing line ??? of "code.py") Traceback (most recent call last): File

-> Short Introduction, you can SKIP this part I'm glad to be able to finally post on this platform, because I for myself have gained so much knowledge through this community; just by reading. So I wanted to say "Hello everybody, and thank you! Actual Content(prologue): Though I'm developing in Objective-C in my company, I am utterly interested in JAVA development. I am quite comfortable with the syntax but have some major troubles with awt/swing/Graphics2D. The Concept: JAVA Application with a 800*600 Frame. On this Frame you can see 16*12 tiles (i.e. gras.jpg or tree.jpg) with a size of 50px²