# Documentation

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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.

## 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 ```

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### Tall Array Support

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

### Tips

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