How to check if an integer is above or below 0.5 continuously ?

Hello everyone.

I have a periodic signal where I try to condition the signal's behavior to be zero in certain parts.

What I'm trying to do exactly is this:

The period of the signal is T.

I want the signal to have some value when 0<time<T/2 and I want signal to have a value of zero when T/2 <= time < T. But I want to do this continuously until the time stops. So for example signal should have a value of zero when 3T/2 <= time < 2T as well.

To put it in words, I want to make a periodic wave's second half equal to zero in every cycle.

How may I do this ?

If it is hard to understand with text:

Red parts should be zero.

Answer 1

[Dyuman Joshi]

If you have numeric data, you can do something like this -

x=0:0.01:3;
y=abs(sin(pi*x));
%original plot
plot(x,y,'k-')
hold on
%modified plot
y(ceil(x)==round(x))=0;
plot(x,y,'b.')

Note - use a tolerance based method rather than == for floating point numeric values

%for example
y(abs(ceil(x)-round(x))<1e-4)=0

[Nuri Efe TATLI]

Thank you very much !

[Nuri Efe TATLI]

Is it possible to implement this if I want to make first half cycle zero instead of second ?

[Dyuman Joshi]

change ceil to floor

x=0:0.01:3;
y=abs(sin(pi*x));
%original plot
plot(x,y,'k-')
hold on
%modified plot
y(abs(floor(x)-round(x))<1e-4)=0;
plot(x,y,'b.')