Plotting graph in matlab?

Question

i need to plot:
y(t) = e^(t/2) * cos(2t) , 0
so i typed:
t=0:0.001:01;
y=exp(t/2)*cos(2t);

but it gives an error for the second line.
can i know how i can correctly enter the function into matlab?

Answer 1

When you create "exp(t/2)", since t is a vector, that expression is a vector.

When you create cos(2t), since t is a vector, that expression is a vector.

You cannot simply multiply vectors in Matlab. You have to tell it to do component multiplication, that is, multiply the first element of each vector, then multiply the second element of each vector, etc., to create a new vector (y).

To do this, you must put a dot "." before the multiplication sign. It should look like this:

y=exp(t/2).*cos(2t);

Answer 2

Since MATLAB allows vectors and matrices to be multiplied two different ways (1. matrix multiplication, as in linear algrebra or 2. element-by-element), you need to specify the correct multiplication. Try this:

t = 0:0.001:01;
y = exp(t/2) .* cos(2*t);
plot(t,y)

See the 'help' function for more information:

help times

versus

help mtimes

Answer 3

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Answer 4

t=0:0.001:01;
y=exp(t/.2)*cos(2*t);
plot(y,t);