# Mapping Functions

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# Available Mapping Functions

Odysseus provides a wide range of functions to be used in a Map, Select, or Join operator.

## Mathematic Function

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### Abs

Returns the absolute value of a value

### Ceil

Returns the smallest value that is greater than or equal to the argument and is equal to a mathematical integer.

### Floor

Returns the largest value that is less than or equal to the argument and is equal to a mathematical integer.

### Round

Returns the closest number to the argument, with ties rounding up

Converts an angle measured in degrees to an equivalent angle measured in radians.

### ToDegree

Converts an angle measured in radians to an equivalent angle measured in degrees.

## Datatype Functions

### DoubleToShort

Converts the given double value to a short value

### DoubleToByte

Converts the given double value to a byte value

### DoubleToFloat

Converts the given double value to a float value

### DoubleToLong

Converts the given double value to a long value

### ToShort

Converts the given value to a short value. This function converts any value to a short value, thus it is more time consuming than the DoubleToShort function for double values.

### ToByte

Converts the given value to a byte value. This function converts any value to a byte value, thus it is more time consuming than the DoubleToByte function for double values.

### ToFloat

Converts the given value to a float value. This function converts any value to a float value, thus it is more time consuming than the DoubleToFloat function for double values.

### ToLong

Converts the given value to a long value. This function converts any value to a long value, thus it is more time consuming than the DoubleToLong function for double values.

## Spatial Grid Functions

### RotateGrid

The SpreadOccupancyGrid function takes 4 parameters: A cartesian grid, the timestamp of the grid, the current timestamp, and the velocity.

### MergeOccupancyGrid

The MergOccupancyGrid function takes 6 parameters: A cartesian grid, the polar coordinates, the origin, the transform angle, the polar radius, and the polar cellsize.

Most function descriptions on this page are copied from the openjdk documentation.

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