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我有以下幾點來計算矩陣的差異,即第i個元素 - (i-1)元素。Numpy:計算矩陣的邊緣
我該如何(輕鬆地)計算每個元素水平和垂直的差異?隨着轉置?
inputarr = np.arange(12)
inputarr.shape = (3,4)
inputarr+=1
#shift one position
newarr = list()
for x in inputarr:
newarr.append(np.hstack((np.array([0]),x[:-1])))
z = np.array(newarr)
print inputarr
print 'first differences'
print inputarr-z
輸出
[[ 1 2 3 4]
[ 5 6 7 8]
[ 9 10 11 12]]
first differences
[[1 1 1 1]
[5 1 1 1]
[9 1 1 1]]