Classic Fourier Series

[salvomic]

(02-01-2015 03:10 AM)Han Wrote:  ...
ak(f,k):=int(f(t)*cos(k*t),t,0,2*PI)/(2*PI); <-- this creates a function named ak, whose arguments are a CAS function f and a constant k; that means 'f' must be a function (see the g(x):=x^2 example), and NOT an expression (see the g:=x^2 example)

Once you understand the difference between the two, your warnings will go away.

thank you, you are very kind about this explanation, very clear, now, for me...
I'll try some variations in the program.

Have a nice Sunday!