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 * 2^e 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.

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 

Tips

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

Extended Capabilities

Tall Arrays

Calculate with arrays that have more rows than fit in memory.

This function fully supports tall arrays. For more information, see Tall Arrays.

GPU Arrays

Accelerate code by running on a graphics processing unit (GPU) using Parallel Computing Toolbox™.

This function fully supports GPU arrays. For more information, see Run MATLAB Functions on a GPU (Parallel Computing Toolbox).

Distributed Arrays

Partition large arrays across the combined memory of your cluster using Parallel Computing Toolbox™.

This function fully supports distributed arrays. For more information, see Run MATLAB Functions with Distributed Arrays (Parallel Computing Toolbox).