Plot like a "scope" block

Hi, my question :

Can I use plot to watch a curve like a scope block do when you put 'scope parameters' sampling to 'Sample time' and no to 'decimal' ?

Thanks !

Answer 1

[Sébastien Malengé]

I find my happiness with stairs ! (and not plot...)

Thanks.

Answer 2

[Paulo Silva]

Answer edited, looking better at the scope it looks like it does something like the ZOH block does, maybe this code can help you:

Ts1=0.01; %sampling time in seconds of the measured signal
%if you don't know Ts1 do Ts1=t(2)-t(1) 
t=0:Ts1:10;
f=@(x)sin(x); %function that generates the signal
s=f(t);
Ts=0.1; %sampling time in seconds of your sampling (Ts must be bigger than Ts1)
sss=cell2mat(arrayfun(@(x)repmat(s(x),1,fix(Ts/Ts1)),1:fix(Ts/Ts1):numel(s),'uni',false));
clf
hold on
plot(t,s)
plot(t,sss(1:numel(t)),'r')
legend('signal',['signal sampled at ' num2str(Ts) ' seconds'])

Example that I wrote but it doesn't do the same as the scope:

t=0:0.01:10;
f=@(x)sin(x); %function that generates the signal
s=f(t);
Ts=1; %sampling time in seconds
tsamp=0:Ts:10;
ssamp=f(tsamp); 
clf
hold on
plot(t,s)
plot(tsamp,ssamp,'r')
legend('signal',['signal sampled at ' num2str(Ts) ' seconds'])

[Sébastien Malengé]

In my case, I have a problem with the length of my curve, I can't use your code if the length is different, so that doesn't work...

Answer 3

[Sébastien Malengé]

In my case, I don't have a function like you, I just have a curve in a variable, so where I suppose to put my curve in the code ? Thanks by the way.

[Arnaud Miege]

The function is just there to generate the data, you can ignore it.

Answer 4

[Arnaud Miege]

You can also use simplot.

HTH

Arnaud