# CONN0

Connector ElementCONN0 lets you rigidify the gradient vectors of a single NLFE grid.

## Format

<CONN0
id       = "integer"
gid      = "integer"
conn     = "string"
/>

## Attributes

id
Unique identification number.
gid
Grid identification number.
conn
String containing at most six characters that describe the connection between the coordinates. See Comment 2 for more details.

## Example

The example demonstrates the definition of a CONN0 element.

<CONN0 id="1000" gid="101" conn="TTFTFF"/>

$\begin{array}{l}r{x}^{T}rx={c}_{1}\\ r{y}^{T}ry={c}_{2}\\ r{z}^{T}rz={c}_{3}\\ r{x}^{T}ry={c}_{4}\\ r{x}^{T}rz={c}_{5}\\ r{y}^{T}rz={c}_{6}\end{array}$
5. If a CONN0 is applied to a grid with only 9 generalized coordinates (for example, grid with only $r,rx,ry$ ), you should not apply any constraints that involve ${r}_{z}$ . For example, conn="TTFTFF" does not apply any constraints involving ${r}_{z}$ and, therefore, satisfies this requirement.