[Simulink/Matlab] How to access variable from M-file?
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Greetings!
I created a model that does channel coding and it employs bpsk and channel repetition.
I have 3 variables that are inputs. snr, rep, frame_size
Where snr is signal to noise ratio, rep is number of repetitions, and frame_size is, well, the frame_size. This isn't really important but figured I would paint a picture...
I want to perform an analysis where I try to find the bit error rate (ber) while varrying the signal to noise ratio and repetitions--for each frame size.
From the command line, I set the snr, rep, and frame_size. Let's say my model is called channel_coding, I then run sim('channel_coding').
Low and behold ber pops up because it is set to go to the workspace as a variable called ber in the model.
So, I want to write a little script that collects all of this data while varying the parameters I mentioned. However, if I set the variable in the m-file, the model doesn't know and if I set the variable at the command line the m-file doesn't know but the model does.
I have tried making the variables snr, rep, and frame_size 'global'. That didn't work.
I also tried using simset() and that didn't work.
So, my friends. Would someone please share with me this secret that the bowels of the internet is hiding from me?
3 Comments
Answers (1)
Fangjun Jiang
on 4 Oct 2011
In that case, I don't see any reason why you can't run the following script, just an example:
all_snr=rand(10,1);
all_rep=1:10;
all_frame_size=10:10:100;
result=zeros(10,3);
for k=1:10
snr=all_snr(k);
rep=all_rep(k);
frame_size=all_frame_size(k);
sim('channel_coding');
result(k,:)=ber;
end
12 Comments
Fangjun Jiang
on 4 Oct 2011
Use simset() is a better solution if your MATLAB version support that. Try to use that as much as you can. Then you don't need to change from M-function to M-script anymore.
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