Whats the purpose of cos function?

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Pooja
Pooja 2013-6-26
%build the matrix
n = 0:N-1;
for k = 0:N-1
if (k>0)
C(k+1,n+1) = cos(pi*(2*n+1)*k/2/N)/sqrt(N)*sqrt(2);
else
C(k+1,n+1) = cos(pi*(2*n+1)*k/2/N)/sqrt(N);
end
end
Is that because of using dct ?or cos function have any other functions ?

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回答（1 个）

Walter Roberson
Walter Roberson 2013-6-26
The cosine function was originally created as a "make work" project for medieval tutors, to convince patrons that the tutors knew something exotic that was worth paying for; in this, the trig functions replaced the earlier Latin Squares Mysteries Strategic Work Initiative.
Later, cosine functions were found to have some useful mathematical properties.

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