2024-04-20 06:55:40 发布
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在python中,我有一个矩阵,我需要将同一个矩阵返回给我,只是我有一个规则,如果该矩阵中的元素是<;0,我将它们各自的值乘以一个常量。但我不知道该怎么做。你知道吗
例如:a=[[0,2,1,4],[-2,3,5,2]],假设我的常数是-0.1,那么我将返回a=[[0,2,1,4],[.2,3,5,2]
演示:
In [55]: a = np.random.randint(-10, 10, size=(10,10)) In [56]: a Out[56]: array([[ 7, 6, 0, 2, 3, -9, 2, -2, 9, -10], [ 8, 4, -10, 5, 7, 6, 7, -3, 1, -3], [ 5, -10, -8, 4, -2, -9, 0, 8, -1, 7], [ 6, 7, 6, 2, -3, 3, 0, -7, -6, -4], [ 8, 0, -7, 7, 9, -4, -5, 7, -5, -9], [-10, -9, -6, -9, -1, 2, -6, -9, 8, -3], [ 5, -3, -6, -5, 6, -8, -10, 7, 3, -5], [ 9, 4, 5, 9, 2, -5, -8, 5, -1, -7], [ -9, -7, -7, -3, -10, -7, 3, -1, 5, 3], [ 0, -4, 9, -9, -5, -1, -8, 9, -4, -5]]) In [57]: a[a<0] *= 10 In [58]: a Out[58]: array([[ 7, 6, 0, 2, 3, -90, 2, -20, 9, -100], [ 8, 4, -100, 5, 7, 6, 7, -30, 1, -30], [ 5, -100, -80, 4, -20, -90, 0, 8, -10, 7], [ 6, 7, 6, 2, -30, 3, 0, -70, -60, -40], [ 8, 0, -70, 7, 9, -40, -50, 7, -50, -90], [-100, -90, -60, -90, -10, 2, -60, -90, 8, -30], [ 5, -30, -60, -50, 6, -80, -100, 7, 3, -50], [ 9, 4, 5, 9, 2, -50, -80, 5, -10, -70], [ -90, -70, -70, -30, -100, -70, 3, -10, 5, 3], [ 0, -40, 9, -90, -50, -10, -80, 9, -40, -50]])
演示:
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