test

mat.py

+M = [
+[3, 2, 1, 2],
+[5, 4, 3, 3],
+[7, 3, 6, 4],
+]
+def sub (M,m,n,x,y):
+    import numpy as np
+    inp =[[0 for a in range(m)] for s in range(n)] 
+    mi=np.array(M)
+    for i in range(x,x+m):
+        for j in range(y,y+n):
+            inp[i-x][j-y]=mi[i,j]
+    print (inp)