## CoMidpoint(x1, y1, x2, y2)

##### Last updated July 17, 2001

**Version:** 1 |
**Requires:** CF5 |
**Library:** MathLib

**Description:**

Returns the coordinates of the midpoint between two points on a line on the Cartesian coordinate system.

**Return Values:**

Returns a string

**Example:**

```
<CFSET x1=1>
<CFSET y1=5>
<CFSET x2=1>
<CFSET y2=-5>
<CFOUTPUT>
Given:
<UL>
<LI>x1,y1 = (1,5)
<LI>x2,y2 = (1,-5)
</UL>
The midpoint between (#x1#,#y1#) and (#x2#,#y2#) = (#CoMidpoint(x1,y1,x2,y2)#)
</CFOUTPUT>
```

**Parameters:**

Name | Description | Required |
---|---|---|

x1 | x position of the first point | Yes |

y1 | y position of the first point | Yes |

x2 | x position of the second point | Yes |

y2 | y position of the second point | Yes |

**Full UDF Source: **

```
/**
* Returns the coordinates of the midpoint between two points on a line.
*
* @param x1 x position of the first point
* @param y1 y position of the first point
* @param x2 x position of the second point
* @param y2 y position of the second point
* @return Returns a string
* @author Rob Brooks-Bilson (rbils@amkor.com)
* @version 1.0, July 17, 2001
*/
function CoMidpoint(x1,y1,x2,y2)
{
Return (x1+x2)/2 & ',' & (y1+y2)/2;
}
```

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