[Y,DELTA] = POLYVAL(P,X,S) or [Y,DELTA] = POLYVAL(P,X,S,MU) uses
the optional output structure S provided by POLYFIT to generate
error estimates, Y +/- delta. If the errors in the data input to
POLYFIT are independent normal with constant variance, Y +/- DELTA
contains at least 50% of the predictions.
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