I need help building a dynamically evolving matrix based on a polynomial of unknown or user inputted size.
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I need help creating an array based on a polynomial of unknown length. Polyval and Poly fit cannot be used.
I need something that would do....
n=length(x);
X=[ones(n,1) x(:)];
% and after 1 iteration
X=[ones(n,1) x(:) x(:).^2];
%and after the 2nd iteration
X=[ones(n,1) x(:) x(:).^2 x(:).^3];
%and after the 3rd iteration
X=[ones(n,1) x(:) x(:).^2 x(:).^3 x(:).^4];
% and so on for n amount of iterations
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Antworten (3)
Walter Roberson
am 22 Apr. 2019
Bearbeitet: Walter Roberson
am 22 Apr. 2019
xv = x(:);
yv = y(:);
X = [];
deg = 0;
while true
X = [X, xv.^deg];
coeffs = X \ yv;
residue = sum( (polyval(flipud(coeffs), xv) - yv).^2 );
if residue < tolerance
break;
end
end
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