# compute ke/multisphere command

## Syntax

    compute ID group-ID ke/multisphere general_keyword general_values

- ID, group-ID are documented in compute command
- ke = style name of this compute command
- general_keywords general_values are documented in compute

## Examples

    compute 1 all ke/multisphere

## Description

Define a computation that calculates the translational kinetic energy of a collection of multisphere bodies.

The kinetic energy of each multisphere body is computed as 1/2 M Vcm^2, where M is the total mass of the multisphere body, and Vcm is its center-of-mass velocity.

This compute automatically connects to the fix multisphere commands which defines the multisphere bodies. The group specified in the compute command is ignored. The kinetic energy of all the multisphere bodies defined by the fix multisphere command in included in the calculation.

## Output info

This compute calculates a global scalar (the summed KE of all the multisphere bodies). This value can be used by any command that uses a global scalar value from a compute as input. See Section_howto 15 for an overview of LIGGGHTS(R)-PUBLIC output options.

The scalar value calculated by this compute is “extensive”. The scalar value will be in energy units.

## Restrictions

> none

## Related commands

compute erotate/multisphere

Default: none