MATLAB Function Reference |

**Syntax**

**Description**

As the basic imaginary unit `sqrt(-1)`

, `i`

is used to enter complex numbers. Since `i`

is a function, it can be overridden and used as a variable. This permits you to use `i`

as an index in `for`

loops, etc.

If desired, use the character `i`

without a multiplication sign as a suffix in forming a complex numerical constant.

You can also use the character `j`

as the imaginary unit.

**Examples**

**See Also**

hsv2rgb | if |

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