Difference between revisions of "CoCoA:FloatApprox"
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Latest revision as of 10:02, 24 October 2007
FloatApprox
approx. of rational number of the form <formula>M*10^E</formula>
Description
This function computes an approximation of the form <formula>M*10^E</formula> to
a rational number X and to within a maximum specified relative error.
RelErr says indirectly how many decimal digits to include in the mantissa. Compare with <ttref>MantissaAndExponent</ttref>.
Example
FloatApprox(1/3, 10^(-2)); 333/1000 ------------------------------- FloatApprox(1000000/3, 10^(-2)); 333000 ------------------------------- FloatApprox(1/3, 10^(-9)); 3333333333/10000000000 -------------------------------
Syntax
FloatApprox(X:RAT, RelErr:RAT):RAT
<type>rat</type>