I'm new to Matlaab and I'm getting this error whitout explanation

This is my first program in Matlab and when I run it I get this error

The program is the following(euler's method)

Why is this happening?

Answer 1

[madhan ravi]

It’s clear that q has 50 elements but you run a loop till 101 so better is to populate q with 101 elements as such

q=linspace(q(1),q(end),numel(x))

[Vasco Araújo]

Thanks! It worked

[madhan ravi]

Anytime :)