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pow2 - Base 2 power and scale floating-point numbers

Syntax

X = pow2(Y)
X = pow2(F,E)

Description

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.

Tips

This function corresponds to the ANSI C function ldexp() and the IEEE floating-point standard function scalbn().

Examples

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

See Also

Arithmetic Operators ^ and .^ | exp | hex2num | log2 | realmax | realmin

  

 

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