在Numpy数组中累加常数 [英] Accumulate constant value in Numpy Array

问题描述

我正在尝试对numpy数组的某些特定单元格进行+1运算，但是如果没有慢速循环，我将找不到任何方法:

I'm trying to sum +1 to some specific cells of a numpy array but I can't find any way without slow loops:

coords = np.array([[1,2],[1,2],[1,2],[0,0]])
X      = np.zeros((3,3))

for i,j in coords:
  X[i,j] +=1 

结果:

X = [[ 1.  0.  0.]
     [ 0.  0.  3.]
     [ 0.  0.  0.]]

X[coords[:,0],coords[:,1] += 1返回

X = [[ 1.  0.  0.]
     [ 0.  0.  1.]
     [ 0.  0.  0.]]

有帮助吗?

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