how to integral f(x).*g(x)

can somebody help me with my problem. here is my code and it cant be run

f = 0.05:0.05:0.4
t=0:.01:20

X=cos(2*pi*f*t)
Y=cos(2*pi*f*t)

g = @(t) X.*Y;
I = integral(g,0,20,'ArrayValued',true);

Answer 1

[Matt J]

f = 0.05:0.05:0.4;
% t=0:.01:20;

X=@(t) cos(2*pi*f*t);
Y=@(t) cos(2*pi*f*t);

g=@(t) X(t).*Y(t);
I = integral(g,0,20,'ArrayValued',true)

I = 1×8

10.0000 10.0000 10.0000 10.0000 10.0000 10.0000 10.0000 10.0000

[Dion Akmal]

thankyou so much for your answer, its really help me because im still new at using matlab

[Matt J]

You're welcome, but please Accept-click the answer to indicate that it helped.

[Dion Akmal]

can you help me again sir ?, why my code below is error, f in my code is scalar that is 0.05, 0,1 , 0.15, 0.2, ...,0.4

f= 0.05 : 0.05 : 0.4

t = 0 : 0.001 : 20

Y = cos(2*pi*0.1*t)