retreat commit

testy/ml/numpybasics.py

@@ -0,0 +1,39 @@
+import numpy as np
+
+a = np.arange(20).reshape(2,2,5)
+print(a)
+
+#b = np.zeros((3,4))
+b = np.arange(12).reshape(3,4)
+print(b)
+#max z kazdeho sloupce
+c =  np.max(b, axis=0)
+#suma kazdeho radku
+c =  np.sum(b, axis=1)
+c = c.reshape(3,1)
+#sumu pridam na konec kazdeho radku, tzn.pripojim sloupce (horizontalne)
+d=np.hstack((b,c))
+print(d)
+
+#indexovani booleanem
+e = np.arange(12).reshape(3,4)
+f = e < 5
+print(e,f)
+print(e[f])
+#vsechny mensi nez 5 se stanou 0
+e[e<5] = 0
+print(e)
+
+
+# c = np.ones((2,2))
+# c = c.reshape(1,4)
+# print(c)
+# print(c*b)
+
+# d = np.arange(4).reshape(2,2)
+# e = d.copy()
+
+# print("d",d)
+# print("e",e)
+# print(d*e)
+# print(d@e)