Preallocating array error problem

How to deal with this kind of error problem?

Answer 1

[KSSV]

You need to initialize the variable before the loop. Initialize using:

error_history = zeros([],1) ; 

Note: Don't show your code as an image snippet.....you should copy paste it here.

[Liew Soon Chian]

Got the error fixed. Many thanks.

[KSSV]

It is not an error... it is a warning.