Matlab Program for exponential wave

Brief Theory

In Exponential Wave, the amplitude varies exponentially with respect to time. Exponential Wave is expressed as y=a*exp(b*t) where a is a constant and b is the amplitude and t is the time. Exponential wave may be positive or negative exponential according to the amplitude. If amplitude is positive it is positive exponential and if amplitude is negative it is negative exponential. In this program I have written the program for positive and negative exponential both continuous and discrete.


Program

% positive exponential continous

clc; %clear command window

t=0:.1:1;

a=input('enter the amplitude');

y=a*exp(5*t); %calculation of exponential wave

subplot(221); % breaks figure window into 2*2 matrix and select 1st axis for current plot

plot(t,y); %continous plot

title('positive exponential continous');

%positive exponential discrete

t=0:.1:1;

y=a*exp(5*t);

subplot(222); %breaks figure window into 2*1 matrix and select 2nd axis for current plot

stem(t,y); %discrete plot

xlabel('time');

ylabel('amplitude');

title('positive exponential discrete');

% negative exponential continous

t=0:.1:1;

y=a*exp(-5*t);

subplot(223);

plot(t,y);

title('negative exponential continous');

xlabel('time');

ylabel('amplitude');

%negative exponential discrete

t=0:.1:1;

y=a*exp(-5*t);

subplot(224);

stem(t,y);

title('negative exponential discrete');

xlabel('time');

ylabel('amplitude');

input

output