Sampling continuous function in Matlab

Question

I'm new to matlab, and in this academic exercise they asked us to do a sampling from a continuous function.

My original functions are:

x = sin(pi * t);
y = cos(2 * pi * t / 3);
z = x + y - 2;

In the interval

t = -8:0.001:8;

Then they asked us to make a sampling, z(n), of z with a period of Ts=0.01 seconds.

My idea was to save in a new vector the values of z, jumping through z ten by ten positions:

n = numel(z);
Zd = z(0:10:z);

This idea came from the fact that 0.01 seconds is ten times less accurate then the first 'continuous' interval t. But matlab says that this is not possible and gives me the error:

??? Subscript indices must either be real positive integers or logicals.

Can somebody give me some hint on this?

Answer 1

As 2 @Memming said, matlab indexes start at 1 and not 0, and that was my problem.

Thanks.