a Fills vector with random values.
-a Changes the sign of all values of .
C All values are set to 0..
Copy function
If this button is pressed, the result is copied to kopiert.
With the buttons "a->b", "a<-b" and "a<-x" values can be copied between the vectors.
a Fills vector 
with random values.
.
If this button is pressed, the result is copied to 
kopiert.