从 MATLAB 中的 integer 中减去一个数组

Question

I think I'm having a hard time understanding the code below in MATLAB. I've expected A to be [3,2,1,0] but it actually returned [3,4] . Why does this happen?

numberpoints = 1;
x = 4;

A = x-numberpoints:x;

Answer 1

This is what it's doing:

> (x-numberpoints):x % (4-1):4 or 3:4

ans =
   3   4

To get your expected output:

> x-(numberpoints:x) % 4-(1:4)

ans =
   3   2   1   0