# step

System object: comm.MatrixInterleaver
Package: comm

Permute input symbols using permutation matrix

## Syntax

`Y = step(H,X)`

## Description

`Y = step(H,X)` permutes input sequence, `X`, and returns interleaved sequence, `Y`. The object fills a permutation matrix with the input symbols row by row and outputs the matrix contents column by column. The input `X` must be a column vector of length `NumRows`$×$`NumColumns` and the data type can be numeric, logical, or fixed-point (fi objects). `Y` has the same data type as `X`.

 Note:   `H` specifies the System object™ on which to run this `step` method.The object performs an initialization the first time the `step` method is executed. This initialization locks nontunable properties and input specifications, such as dimensions, complexity, and data type of the input data. If you change a nontunable property or an input specification, the System object issues an error. To change nontunable properties or inputs, you must first call the `release` method to unlock the object.