Creat Signal in Simulink

Dear,

I have a signal that i have saved in my workspace with the name is Matlab.mat This is my result of the previous simulation.

Now,I want to use this file to creat a signal for another simulation. How can i do it? If you have another methods to creat this signal? please help me!

Thanks with best regard!

Pham Van Dung

Answer 1

[Azzi Abdelmalek]

1. your file matlab.m must contains the time t and the signal y (for example)
2. i don't know how you saved your signal
3. if your signal y and time t are 1xn array

 ty=[t;y]
 save matlab ty

% then in simulink, from sources, use "from file" and set the name of your file "matlab"

[Pham Van Dung]

Thanks for your helping! I have load my signal in workspace already! 1. My file also contains T and Y axes! 2. In scope Parameter ---> Data History---> save the data in workspace 3. It's also an array. But Now i got a new problem! My signal is continuosly and now i want to use this signal in discrete system. How can i solve this problem? Thanks with best regard!

Pham Van Dung

[Azzi Abdelmalek]

what do you mean?

Answer 2

[Mariano Lizarraga]

You need to post a little bit more information about how the data from the first simulation are saved.

Supposing that you have in Matlab.mat in the workspace and that it contains the two things you need to use: the time vector and the signal data, then you can use the "From Workspace" block to make that signal available in Simulink: http://skit.ch/nwnt

A few things to consider: Although not strictly necessary, it is better if you make sure that the sample time in your "From Workspace" block is the same as the time vector in your source signal. Also if your second model will run longer than the data set you got from the first simulation, decide what behavior you want on the "From Workspace" block after the time vector reaches its end; you can either set the output to zero, cycle over, hold the final value or extrapolate it.

[Mariano Lizarraga]

There is also a full Tech Note about how to do this: http://www.mathworks.com/support/tech-notes/1900/1902.html