In the future, please don't post a picture of your code, post your code itself (formatted using the first button of the Code section of the message editor's toolstrip.)
Your line 39 is incorrect. Compare what you wrote (with the semicolon removed, so you can see what it created):
with what you likely meant:
x0 = randn(10,1)
x0 =
0.0797
-0.1291
0.8241
0.5541
-0.4408
0.5157
0.5580
1.3633
-1.3299
0.3437
Using 10:1 attempts to create an array of that size, which results in you getting an empty array.
10:1
ans =
1×0 empty double row vector
If you'd flipped the two sizes it would "work" but you'd be creating a much larger array.
whos x0 x1 x2
Name Size Bytes Class Attributes
x0 10x1 80 double
x1 10-D 29030400 double
x2 1x10 80 double
For generality, I recommend you also avoid hard-coding sizes like 10. If you modified your A you'd also have to modify everywhere your code assumes A has 10 columns. If instead you computed the sizes of x0 and other intermediate arrays using the size of A your code is more flexible.
