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Fit an equation to a matrix

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som
som 2012-11-13
Hi all,
I have a matrix like
a=[3 7 6; 8 5 7; 1 4 7];
I want to fit an equation like below to all elements of a matrix.
how can I write this program
y= -5E-05*X^2 + 0.115*X + 1989.6,
Thanks in advance

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