I am getting this error:

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Ashley Turato
Ashley Turato on 22 Apr 2016
Answered: Image Analyst on 22 Apr 2016
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?
  1 Comment
Star Strider
Star Strider on 22 Apr 2016
Running only that loop (and creating a ‘t’ vector), I cannot reproduce that error.

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Answers (2)

J. Webster
J. Webster on 22 Apr 2016
I don't get an error, are you sure the code above is what you have in your program?

Image Analyst
Image Analyst on 22 Apr 2016
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.

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