I am getting this error:

I am trying to use the following Matlab function:

function [ N,n ] = rn( t )

N=size(t,2); rand('seed',0);

n(1)=rand-0.5; for i=2:N;

n(i)=0.3*n(i-1)+1.5*(rand-0.5);

end

with this script:

clear all

clc

t=0:0.02:10;

x=0.5.*(ur(t-2)-2*ur(t-4)+ur(t-6));

[A,B]=rn(t);

y=B+x; %adding the noise to the triangular pulse signal

plot(t,y);

however, I am getting the following error:

Subscript indices must either be real positive integers or logicals.

Error in rn (line 7)
n(i) = 0.3*n(i-1)+1.5*(rand()-0.5);

Error in engg177parte (line 5)
[A,B]=rn(t);

Why is this error occuring?

[Star Strider]

Running only that loop (and creating a ‘t’ vector), I cannot reproduce that error.

Answer 1

[J. Webster]

I don't get an error, are you sure the code above is what you have in your program?

Answer 2

[Image Analyst]

In my file, test3.m I put this:

function test3
% clear all
clc
t=0:0.02:10;
x=0.5.*(ur(t-2)-2*ur(t-4)+ur(t-6));
[A,B]=rn(t);
y=B+x; %adding the noise to the triangular pulse signal
plot(t,y);

function [N, n] = rn(t)
N=size(t,2);
rand('seed',0);
n(1)=rand-0.5;
for i=2:N
  n(i)=0.3*n(i-1)+1.5*(rand-0.5);
end

and I get this:

Undefined function or variable 'ur'.
Error in test3 (line 5)
x=0.5.*(ur(t-2)-2*ur(t-4)+ur(t-6));

as you can see, you forgot to tell us what you're using for ur. I'll check back and try again later once you tell me what ur is.