Shifting signal down

[Rick T]

Greetings all

I have a signal that is created from 0 to 1 for the square,rectangle and the sawtooth signals on the y axis how can I shift the signal down (vertical offset) so the signal will go from -0.5 to 0.5 on the y axis, and change the triangle signal from 0.5 to 1.0 to -0.5 to 0.5?

clear all

% SCRIPT BEGINS

t=linspace(0,1,22050)

freq=5%how many times it repeats in 1 sec

A = 1; % amplitude

T = 1/freq; % period of the signal

% square

square = mod(t * A / T, A) > A / 2;

plot(t, square)

title('Square');

% rectangle

l = 0.2; % percentage the signal spends on low value

rectangle = mod(t * A / T, A) > A * l;

figure;

plot(t, rectangle);

title('Rectangle');

% sawtooth

sawtooth = mod(t * A / T, A);

figure;

plot(t, sawtooth);

title('Sawtooth');

% triangle

triangle = (mod(t * A / T, A) > 0.5).*mod(t * A / T, A) + (mod(t * A / T, A) <= 0.5).*(1 - mod(t * A / T, A));

figure;

plot(t, triangle);

title('triangle');

thanks

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