Im trying to convolute a rect function and a sinc function

Im currenlty trying to find the tip angle and to do that I have to use a formula that involves the convolution of a sinc and rect function.

clear
clc
close all
B0 = 1.5;
df = 4.258e4;
A = 2;
t = -1:1e-4:1;
N = length(t);
V = 63.87e6;
tp = 2e-3;

zbar = 0;
z = 0.1:1e-3:1;
dz = 3.33333333333333;
Gz = 3;


a = 2* pi* df* tp* A* rectangularPulse(z/dz);
b = sinc(2* pi* df* tp* Gz(z));



conv2(a,b, 'same')

Here is the Error I get

Array indices must be positive integers or logical values.

Error in hrhrhs (line 19)
b = sinc(2* pi* df* tp* Gz(z));
 

Answer 1

[Paul]

Because Gz is a variable, not a function, Gz(z) is trying to use the vector z as an index into the variable Gz. But z contains elements that are neither positive integers nor logicals, hence the error.

What is Gz(z) intended to be?