polyfit()

[andra...@my-dejanews.com]

hi all

please excuse my ignorance, but so far i've been unable to identify a
scilab equivalent to matlab's polyfit() function.

i have a uni. assignment which requires me to fit a polynomial curve to a
small table of data; only matlab is supported by my academic staff.

tia

andy b.

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[Matthew Halfant]

function p = polyfit(x, y, n, s)
// return coefficient vector or poly if fourth string argument given
[lhs, rhs] = argn(0)
x = x(:); y = y(:)
m = length(x)
if length(y) <> m, error('x and y must have same length'), end
v = ones(m,n+1)
for i=2:n+1, v(:,i) = x.*v(:,i-1), end
p = (v\y)'
if rhs > 3, p = poly(p, s, 'coeff'), end