Error using plot Vectors must be the same length.

Hi everyone,

I am trying to convolve two step function signals for school assignment the two signals are:

x(t) = (-t+3)(u(t)-u(t-3))

h(t) = 2u(t+2)-u(t+1)

I wrote the code below, when I ran the code I keep getting the "Error using plot

Vectors must be the same length.".the vector generated by the conv command is longer than the t vector!

any help will be appreciated.

clear all
clc

dt=0.01; t= -7:dt:6;

x = 2*heaviside(t+2)-heaviside(t+1);
h =(-t+3).*heaviside(t)-(-t+3).*heaviside(t-3);
y= dt.* conv (x,h);
plot(t,y)

whos

Name Size Bytes Class Attributes

dt 1x1 8 double

h 1x1301 10408 double

t 1x1301 10408 double

x 1x1301 10408 double

y 1x2601 20808 double

these are the values in my work space.

Answer 1

[Star Strider]

To create ‘y’ to be the same length as ‘t’, use the 'same' shape argument in conv:

y= dt.* conv (x,h,'same');

[Star Strider]

Michael Darwish’s Answer moved here —

Thank you for your answer.

[Star Strider]

My pleasure.

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