m)中提取mxm子矩阵?" data-bg="https://pythondict-1252734158.file.myqcloud.com/home/www/pythondict/wp-content/uploads/2023/10/web-4877959_1280-150x100.jpg" data-prefetch="true"> m)中提取mxm子矩阵?" data-prefetch="true">切片NumPy 2d数组,或者如何从nxn数组(n> m)中提取mxm子矩阵?