# Error using plot Vectors must be the same length.

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Michael Darwish 2019 年 11 月 22 日
Commented: Star Strider 2019 年 12 月 25 日
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.

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### 件の回答 (1)

Star Strider 2019 年 11 月 22 日
To create ‘y’ to be the same length as ‘t’, use the 'same' shape argument in conv:
y= dt.* conv (x,h,'same');

#### 2 件のコメント

Star Strider 2019 年 12 月 25 日
Michael Darwish’s Answer moved here —
Star Strider 2019 年 12 月 25 日
My pleasure.