As usual, we begin by wiping memory and loading what we need.
restart; with(plots): with(orthopoly):
Homework 6 Supplement
Definition of cosine and sine fourier series
From the Supplement to Lab 5: cosine series routines
There are two differences between this and what was in Lab 6.
assume(n,integer);assume(m,integer):
In the definition of the cosine I've change the period to 2L
c := (x,n) -> cos((2*Pi*n*x)/(2*L)):
and the integral below for A goes from -L to L, not from 0 to L:
A:=proc(expr,var,n)
evalf(simplify(int(expr*c(var,n),var=-L..L)/int(c(var,n)*c(var,n),var=-L..L)));
end proc:
cosineFP:=proc(expr,var,n)
A(expr,var,0)+add(A(expr,var,m)*c(var,m),m=1..n);
end proc:
From the solutions to Lab 5: sine series rountines
Again, we change the sine term so the period is 2L
s := (x,n) -> sin((2*Pi*n*x)/(2*L)):
and the integrals go from -L to L
B:=proc(expr,var,n)
evalf(simplify(int(expr*s(var,n),var=-L..L)/int(s(var,n)*s(var,n),var=-L..L)));
end proc:
sineFP:=proc(expr,var,n)
add(B(expr,var,m)*s(var,m),m=1..n);
end proc:
Finally, we define a full Fourier series that is the sum of the sine and cosine series
fullFP := proc(expr,var,n)
cosineFP(expr,var,n)+sineFP(expr,var,n);
end proc:
Legendre polynomial expansion
First a routine to calculate the coefficients, copied from the Lab 6 solutions.
legcoeff := proc (f,x,n)
local a;
a := evalf(((2*n+1)/2)* int(f*P(n,x),x=-1..1));
return(a);
end:
Now the function that calculates the series expansion. Note that I've used add instead of sum.
legseries := proc(f,x,nmax)
local s;
s := add(legcoeff(f,x,n)*P(n,x),n=0..nmax);
return(collect(s,x));
end:
Part a
First we define the function of interest (replace this with the function given in the Homework ) and define L:
f := x-> (x^2-1)*sin(x): L:=1:
Examples of using each of the series fitting routines above:
Fourier series:
fourier5:=fullFP(f(x),x,5);
LCwtSSRzaW5HNiQlKnByb3RlY3RlZEdJKF9zeXNsaWJHNiI2IyomSSNQaUdGJiIiIkkieEdGKEYsJCErOyE0a24kISM1LUYkNiMsJEYqIiIjJCIrSnU8Nk0hIzYtRiQ2IywkRioiIiQkISs1dUoiZSohIzctRiQ2IywkRioiIiUkIitdJylwblJGPi1GJDYjLCRGKiIiJiQhK0lcNTk/Rj4=
Taylor series...NOTE THAT TO GET TERMS up to say, x^5, you need to tell Maple to go to the 6th term:
ftaylor5:=unapply(convert(taylor(f(x),x,6),polynom),x);
Zio2I0kieEc2IkYlNiRJKW9wZXJhdG9yR0YlSSZhcnJvd0dGJUYlLCg5JCEiIiokRioiIiQjIiIoIiInKiRGKiIiJiMhIigiI1NGJUYlRiU=
And, finally, Legendre :
fleg5 := legseries(f(x),x,5);
LChJInhHNiIkIStTIkdIKioqISM1KiRGIyIiJCQiKysrWGc2ISIqKiRGIyIiJiQhKytdUDk7Ric=
Below, a sample plot with a legend, reminding you how it is done...in the graph you make the four different functions will actually look different from each other.:
plot([f(x),fourier5,ftaylor5(x),fleg5],x=-1..1,color=black,linestyle=[1,2,3,4],legend=["f","Fourier","Taylor","Legendre"]);
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