Use only a certain range of values for a function

Well, I do really have a simple question that i have been looking around for a good answer to.

I have a function z which is a result from convoluting an impulse repsone function h, and y taking from an audio signal.

[y,Fs] = audioread('Test1.wav');

%sound(y,Fs)

delay=0.8*Fs; %Delay

attenuation_factor=0.4;

h1=zeros(1,delay+1);%Impulse

h1(delay+1)=attenuation_factor; %Impulse at delay

h1(1)=1;

z=conv(y,h1); %Convolution

I want to limit the values of z to be only between 0 and 3 seconds; so i can output the sound and plot it later on.

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subplot(4,1,2);

t_z=(0:numel(z)-1)/Fs;

plot(t_z,z)

ylabel('Orginal with Echo')

xlabel('time')

sound(z,Fs);

I have tried using Xlim and Xmax method, but couldnot figure it out the best

z(z < numel(Fs) |z > 0) = [];

Answer 1

[Voss]

truncated_z = z(t_z <= 3);

[Abdelrhman Abdelfatah]

Thank you so much!

[Voss]

You're welcome!