errors in matlab function block in simulink

i am trying to create a matlab function block in the Simulink that generates square pulses as pulse generator but errors appear please help , I attached screenshots.

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Answer 1

[Azzi Abdelmalek]

Your code is not correct. Plus, generating a puls train with Matlab function is not a good idea. You have to know that your Matlab function block, the way it's programmed, will outpu,t each sample time, an entire array.

You can generate such signal with from file block, from worksapce block or using repeated sequence

If you want to use from file block

Fs=1e+9
tend=10*4e-6
t=0:1/Fs:tend;
pulsewidth=1e-6
pulseperiods=(0:10)*4e-6
x=pulstran(t,pulseperiods,'rectpuls',pulsewidth)
v=[t;x];
save yourfile v

Then set the name "yourfile" in the frome file block

[mohamed samhy]

should I write your code in the matlab function block or where please clarify ? ( and thanks for helping really appreciate it )

[Azzi Abdelmalek]

No, in a script, or Windows Command. The aim is to create the file that contains your signal.

[mohamed samhy]

I saved it by this name , how should I implement it now in the Simulink block ?

[Azzi Abdelmalek]

from file block

[Azzi Abdelmalek]

Another way is to use repeating sequence block set the x variable to your block

[mohamed samhy]

that error appears and no o/p

[mohamed samhy]

[Azzi Abdelmalek]

What error?

[mohamed samhy]

[mohamed samhy]

and the scope shows no square pulses , sorry for disturbance I really appreciate your helping

[Azzi Abdelmalek]

In model configuration parameters set the solver to discret. and set the stop time to tend

[mohamed samhy]

I adjusted the solver to discrete but I cant find how to set the stop time

[mohamed samhy]

I found the stop time you mean I adjust it to ( 10 ) ? I will try now

[Azzi Abdelmalek]

no, set it to tend. because your frequency is very high 1e9. If you want to see quickly your pulse train, set the stop time to t(end) or tend

[mohamed samhy]

it shows error because tend it is very big and maximum is 200000

[Azzi Abdelmalek]

Do you know what is tend?

[Azzi Abdelmalek]

From your code:

tend=10*4e-6

How now it's equal to 200000?

[mohamed samhy]

yes the period of my square train pulse which is 4 microseconds

[mohamed samhy]

sorry this was shown to me not 20000

[mohamed samhy]

thanks for help I just failed to do it and I exhausted you thanks again

[Azzi Abdelmalek]

Have you read my previous comment? probably you have cleared the variable tend. before running your simulink model you need to set the variable tend to its original value

tend=10*4e-6

[mohamed samhy]

u mean from the variables in the matlab , ohh I thout Simulink is isolated from matlab . I will try now

[mohamed samhy]

I tried again same error , I got exhausted seems I cant do it , if u can send me a file I would really appreciate it , thanks again for all.

[Azzi Abdelmalek]

here the attached mat file

[mohamed samhy]

I have a problem in the Simulink model if u please lastly can send it to me , my attached file is same as yours because I did it by your step but the Simulink is hard to run without errors. thanks so much so far

[mohamed samhy]

https://www.dropbox.com/s/a5dlpl56eoohbhf/matfunc.zip?dl=0 this my Simulink file if u can attach your file and see what error appear that will be so helpful , thanks

[Azzi Abdelmalek]

Here a simulink model

[mohamed samhy]

it did work ,man you are such a great helpful person hope u have a happy life for helping people so much . thanks again man :)