Hello. Im currently creating a code in Matlab and I am running into this error that I will attach in a screenshot. I am new to Matlab so I am having trouble fixing it.

clear all
clc
t=0:0.01:5;
h=12.0 * exp(-2.0*t).*(t>= 0);
x=5* (t >= 0)-5* (t >=1.0);
y=conv(x,h,'full')*0.01;

figure;
subplot(3,1,1);
plot(t,h,'r','Linewidth',2);
title('Impulse Response h(t)');
xlabel('time (s)');
ylabel('amplitude');

subplot(3,1,2);
plot(t,x,'b','Linewidth',2);
title('input signal x(t)');
xlabel('time (s)');
ylabel('amplitude');

subplot(3,1,3);

plot(t(1:length(y)),y,'g','Linewidth',2);

Index exceeds the number of array elements. Index must not exceed 501.

title('Analytical System Response y(t)');
xlabel('time (s)');
ylabel('amplitude');

[the cyclist]

Instead of uploading a screenshot of your code, upload a *.m file with your code, or just paste the text into the window. Otherwise, we have to re-type all your code to run it.

[John D'Errico]

When you attach a picture of code, you make it far more difficult for someone to help you, since we are forced to retype your code completely.

What is worse, if you don't even show the error you got! Can we read your mind? I'm tryign, but the MATLAB crystal ball is foggy today.

Is there a good reason why you want to make it more difficult to get help, since it is trivial to paste in the text itself?

When you do give us the text, also paste in the COMPLETE ERROR MESSAGE. So EVERYTHING in red.

[Logan]

here is the code that is in the screenshot. Im sorry, this is the first question I have asked and did not know the exact specifics on how to post. The error that I am getting is "Index exceeds the number of array elements. Index must not exceed 501."

clear all
clc
t=0:0.01:5;
h=12.0 * exp(-2.0*t).*(t>= 0);
x=5* (t >= 0)-5* (t >=1.0);
y=conv(x,h,'full')*0.01;

figure;
subplot(3,1,1);
plot(t,h,'r','Linewidth',2);
title('Impulse Response h(t)');
xlabel('time (s)');
ylabel('amplitude');

subplot(3,1,2);
plot(t,x,'b','Linewidth',2);
title('input signal x(t)');
xlabel('time (s)');
ylabel('amplitude');

subplot(3,1,3);

plot(t(1:length(y)),y,'g','Linewidth',2);

Index exceeds the number of array elements. Index must not exceed 501.

title('Analytical System Response y(t)');
xlabel('time (s)');
ylabel('amplitude');

Answer 1

[Walter Roberson]

y=conv(x,h,'full')*0.01;

The length of a 'full' convolution is longer than than the individual inputs: it is (length(First) + length(Second) - 1)

plot(t(1:length(y)),y,'g','Linewidth',2);

You use the length of the full convolution to index something that is the length of the original signal.

Answer 2

[Image Analyst]

If you want to clip off the ends, use the 'same' option instead of 'full' in conv.