# OOF2: The Manual

## Name

Vector XYFunction — Compute an arbitrary vector function of x and y.

## Output Categories

## Parameters

`fx`

- The x component of the function as a Python function of x and y
*Type*: A string defining a function of x and y. `fy`

- The y component of the function as a Python function of x and y
*Type*: A string defining a function of x and y.

## Description

Compute a vector function of spatial coordinates
`x`

and `y`

on a `Mesh`

.

The function is evaluated by the Python interpreter, so it can
contain any legal Python expressions. Any variables defined in the
**OOF2** Console window
can be used in the function. For example, if you type

`slope=3`

in the Console, you can enter

`slope*x + y`

for `fx`

or `fy`

. The Python
math library is also available. You could set
`fx`

to

`sin(x*y/100)`

for example.