Borrar filtros
Borrar filtros

TF function on Simulink

5 visualizaciones (últimos 30 días)
Manos el 28 de Feb. de 2014
Comentada: Ryan Rizzo el 21 de Mzo. de 2018
Hello I am trying to create a MATLAB function on simulink that ,between others, requires the use of the 'tf' function . Problem is I can't really find a way to use the output of the 'tf' function since it's an mxarray. So when I run something like this
function y = fcn(u)
g=tf([1],[1 1]);
I get this error: MATLAB expression 'mtimes' is not numeric. Block MATLAB Function (#36) While executing: none . Initializing g gives me the 'is not numeric' error so it won't help... So I was wondering if there is anyway to get it done - the scripting way, I know I can use transfer function simulink blocks etc...Thanks in advance. (I am using Matlab R2012b btw)
  4 comentarios
Manos el 28 de Feb. de 2014
Editada: Manos el 28 de Feb. de 2014
What I am asking is : If there wasn't a "Transfer Function" block on Simulink already , how would you "design" it manually using a matlab function block?
Ryan Rizzo
Ryan Rizzo el 21 de Mzo. de 2018
Hi Manos, how did you manage to solve this issue?

Iniciar sesión para comentar.

Respuestas (1)

Rick Rosson
Rick Rosson el 28 de Feb. de 2014
Multiplication is not the same thing as convolution. This approach will not work. You need to write a function that performs continuous time convolution. The only way to do that is to approximate the solution by approximating the continuous integral as a discrete summation over a small sample size. It should be possible, but not easy or fun.
Why not just use the TF block provided by a Simulink? No sense reinventing the wheel.
  1 comentario
Manos el 28 de Feb. de 2014
But since G is in the frequency domain isn't multiplication correct? Why would I have to use convolution??? (I know it makes absolutely no sense trying this the long way, I am just really stubborn :P ) Thanks a lot for your answer Rick!

Iniciar sesión para comentar.


Más información sobre Simulink Functions en Help Center y File Exchange.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by