Base 2 power and scale floating-point numbers
X = pow2(Y)
X = pow2(F,E)
X = pow2(Y) returns an
array X whose elements are 2 raised to the power Y.
X = pow2(F,E) computes x = f *
2e for corresponding
elements of F and E. The result
is computed quickly by simply adding E to the floating-point
exponent of F. Arguments F and E are
real and integer arrays, respectively.
For IEEE® arithmetic, the statement X = pow2(F,E) yields
the values:
F E X
1/2 1 1
pi/4 2 pi
-3/4 2 -3
1/2 -51 eps
1-eps/2 1024 realmax
1/2 -1021 realmin This function corresponds to the ANSI® C function ldexp() and
the IEEE floating-point standard function scalbn().