%******************************%
%* Karlo V. Miranda           *%
%* ECE 300 Recitation         *%
%* Assignment no.2            *%
%* 01 / 30 / 01               *%
%******************************%


%*------------ Ramp Function M-File Code: r(at + b) ---------------------------*%

clear;
clear r;
disp('To plot ramp function r(at+b)');
a=input('Value of a ? ');
b=input('Value of b ? ');
t=-5:0.1:5;

for i=1:length(t)
        if (abs(a*t(i) + b) >= 0)
                r(i) = a*t(i) + b;
        else
                r(i) = 0;
        end
end

plot(t,r,'r--');
axis([-5,5,-5,5]);
grid;
title('Ramp Function: r(at+b)');
xlabel('time (t)');
ylabel('amplitude (a)');

%*------------ Step Function M-File Code: u(at + b) ---------------------------*%

clear;
clear u;
disp('To plot step function u(at+b)');
a=input('Value of a ? ');
b=input('Value of b ? ');
t=-5:0.1:5;

for i=1:length(t)
        if (abs(a*t(i) + b) >= 0)
                u(i) = 1;
        else
                u(i) = 0;
        end
end

plot(t,u,'r--');
axis([-5,5,-5,5]);
grid;
title('Step Function: u(at+b)');
xlabel('time (t)');
ylabel('amplitude (a)');

%*------------ Rect Function M-File Code: rect(at + b) ---------------------------*%

clear;
clear rect;
disp('To plot rect function rect(at+b)');
a=input('Value of a ? ');
b=input('Value of b ? ');
t=-5:0.1:5;

for i=1:length(t)
        if (abs(a*t(i) + b) >= -0.5) & (abs(a*t(i) + b) <= 0.5)
                rect(i) = 1;
        else
                rect(i) = 0;
        end
end

plot(t,rect,'r--');
axis([-5,5,-5,5]);
grid;
title('Rect Function: rect(at+b)');
xlabel('time (t)');
ylabel('amplitude (a)');

%*------------ Decay Function M-File Code: s(at + b) --------------------------*%

clear;
clear decay;
disp('To plot decay function decay(at+b)');
a=input('Value of a ? ');
b=input('Value of b ? ');
t=-5:0.1:5;

for i=1:length(t)
        if (abs(a*t(i) + b) >= 0
                decay(i) = exp(-abs(a*t(i) + b));
        else
                decay(i) = 0;
        end
end

plot(t,decay,'r--');
axis([-5,5,-5,5]);
grid;
title('Decay Function: decay(at+b)');
xlabel('time (t)');
ylabel('amplitude (a)');

%*-----------------------------------------------------------------------------*%
%*-----------------------------------------------------------------------------*%