# j

## Purpose

Imaginary unit.

## Synopsis

    j
    x+yj
    x+j*y

## Description

You can use the character `j` in place of the character `i` as the imaginary unit.

As the basic complex unit `sqrt(-1)`, `j` is used to enter complex numbers. Since `j` is a function, it can be overridden and used as a variable, if desired. Thus, you can still use `j` as an index in `for` loops, etc.

You can also use the character `j` without a multiplication sign as a suffix in forming a numerical constant.

## Examples

    Z = 2+3j
    Z = x+j*y
    Z = r*exp(j*theta)

## See Also

    conj, i, imag, real

(c) Copyright 1994 by The MathWorks, Inc.