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Q&A When I use the piecewise function I get more columns in the output

I have this code syms t y(t) = t*heaviside(t)*heaviside(1-t); x(t) = piecewise(0<=t<=1,1,t<0,0,t>1,0); l = -2:0.01:2; disp(y(l)); disp(x(l)); and in the output, I ge...

0 answers  ·  posted 2y ago by MissMulan‭  ·  edited 2y ago by Alexei‭

#4: Post edited by user avatar Alexei‭ · 2022-08-31T08:08:10Z (about 2 years ago)
added relevant tag
  • I have this code
  • ```
  • syms t
  • y(t) = t*heaviside(t)*heaviside(1-t);
  • x(t) = piecewise(0<=t<=1,1,t<0,0,t>1,0);
  • l = -2:0.01:2;
  • disp(y(l));
  • disp(x(l));
  • ```
  • and in the output I get 2 vectors which is ok. But if you look at those vectors
  • ![](https://software.codidact.com/uploads/8L1AGjYt5NUtPd5n3tcHCNMp)
  • they don't have the same size and this is a problem because I want to find the convolution of the functions `y(t)` and `x(t)`. Why when I use the piecewise function the output vector is bigger than the output vector of the function `t*heaviside(t)*heaviside(1-t)`?
  • I have this code
  • ```
  • syms t
  • y(t) = t*heaviside(t)*heaviside(1-t);
  • x(t) = piecewise(0<=t<=1,1,t<0,0,t>1,0);
  • l = -2:0.01:2;
  • disp(y(l));
  • disp(x(l));
  • ```
  • and in the output, I get 2 vectors which is ok. But if you look at those vectors
  • ![Matlab output when applying the defined piecewise function](https://software.codidact.com/uploads/8L1AGjYt5NUtPd5n3tcHCNMp)
  • they don't have the same size and this is a problem because I want to find the convolution of the functions `y(t)` and `x(t)`. When I use the piecewise function the output vector is bigger than the output vector of the function `t*heaviside(t)*heaviside(1-t)`?
#3: Post edited by user avatar Moshi‭ · 2022-08-31T04:50:02Z (about 2 years ago)
Formatting
When I use the piecewise function I get more  columns in the output
  • I have this code
  • syms t
  • y(t) = t*heaviside(t)*heaviside(1-t);
  • x(t) = piecewise(0<=t<=1,1,t<0,0,t>1,0);
  • l = -2:0.01:2;
  • disp(y(l));
  • disp(x(l));
  • and in the output I get 2 vectors which is ok.But if you look at those vectors
  • ![](https://software.codidact.com/uploads/8L1AGjYt5NUtPd5n3tcHCNMp)
  • they dont have the same size and this is a problem because I want to find the convolution of the functions y(t) and x(t).Why when I use the piecewise function the output vector is bigger than the output vector of the function t*heaviside(t)*heaviside(1-t)?
  • I have this code
  • ```
  • syms t
  • y(t) = t*heaviside(t)*heaviside(1-t);
  • x(t) = piecewise(0<=t<=1,1,t<0,0,t>1,0);
  • l = -2:0.01:2;
  • disp(y(l));
  • disp(x(l));
  • ```
  • and in the output I get 2 vectors which is ok. But if you look at those vectors
  • ![](https://software.codidact.com/uploads/8L1AGjYt5NUtPd5n3tcHCNMp)
  • they don't have the same size and this is a problem because I want to find the convolution of the functions `y(t)` and `x(t)`. Why when I use the piecewise function the output vector is bigger than the output vector of the function `t*heaviside(t)*heaviside(1-t)`?
#2: Post edited by user avatar MissMulan‭ · 2022-08-30T21:14:03Z (about 2 years ago)
  • I have this code
  • syms t
  • y(t) = t*heaviside(t)*heaviside(1-t);
  • x(t) = piecewise(0<=t<=1,1,t<0,0,t>1,0);
  • l = -2:0.01:2;
  • disp(y(l));
  • disp(x(l));
  • and in the output I get 2 vectors which is ok.But if you look at those vectors
  • ![](https://software.codidact.com/uploads/8L1AGjYt5NUtPd5n3tcHCNMp)
  • they dont have the same size and this is a problem because I want to find the convolution of these 2 functions.Why when I use the piecewise function the output vector is bigger than the output vector of the function t*heaviside(t)*heaviside(1-t)?
  • I have this code
  • syms t
  • y(t) = t*heaviside(t)*heaviside(1-t);
  • x(t) = piecewise(0<=t<=1,1,t<0,0,t>1,0);
  • l = -2:0.01:2;
  • disp(y(l));
  • disp(x(l));
  • and in the output I get 2 vectors which is ok.But if you look at those vectors
  • ![](https://software.codidact.com/uploads/8L1AGjYt5NUtPd5n3tcHCNMp)
  • they dont have the same size and this is a problem because I want to find the convolution of the functions y(t) and x(t).Why when I use the piecewise function the output vector is bigger than the output vector of the function t*heaviside(t)*heaviside(1-t)?
#1: Initial revision by user avatar MissMulan‭ · 2022-08-30T21:13:12Z (about 2 years ago)
When I use the piecewise function I get more  columns in the output
I have this code
 
syms t 

y(t) = t*heaviside(t)*heaviside(1-t);

x(t) = piecewise(0<=t<=1,1,t<0,0,t>1,0);

l = -2:0.01:2;

disp(y(l));

disp(x(l));

and in the output I get 2 vectors which is ok.But if you look at those vectors 

![](https://software.codidact.com/uploads/8L1AGjYt5NUtPd5n3tcHCNMp)

they dont have the same size and this is a problem because I want to find the convolution of these 2 functions.Why when I use the piecewise function the output vector is bigger than the  output vector of  the function t*heaviside(t)*heaviside(1-t)?