# Function Logs

Click the Log | Create Log | Function
command to create a function log. Function logs allow multiple log variables
to be combined into a single log using a mathematical
equation. The log variables being combined can contain different depth
spacings and be from different tables. After the function is defined,
a new data table is created and a line/symbol plot is displayed in the
view window.

In this example, the log values in log A are multiplied

by the log values in log B to create the purple function
log.

Data Requirements

Function logs use existing line/symbol
and bar logs to create the function log. No
data table is initially required, beyond those used to create the line/symbol
and bar logs. The data table that is created is a depth table that contains
Hole ID, Depth, and the Math Results columns. See
the Function Log Dialog
page for information on selecting the logs and functions.

## Creating a Function Log

To create a function log:

Click the Log | Create
Log | Function command.

Click inside the log pane where you want the function
log to appear.

The Function
Log dialog appears. Use the Log
Variables, Operator, and Functions
to create a Function Expression
and click OK.

The
new Math Results data
table is created and the log appears in the view window.

If you are in active
mode a line/symbol log is created using the default properties. If
you are in design mode, a line/symbol log
graphic is displayed as a place holder after step 4.

## Editing Function Log Properties

To change the features of a function log, click on the
line/symbol log in the Object Manager
or view window. The properties are listed in the Property
Manager.

The following tabs are listed in the Property
Manager:

Log

Label

Line

Fill

Symbol

Water
Level

## Function Properties

The actual function is not editable in the view window.
The Math Results table that is
created can be edited and the log will update, but the function is not
editable. To see the function used to create a function log, click on
the Math Results table. Click
the Table |
Edit Column Properties command. Click the button
twice, until column 3 is displayed. The function is listed in the Column Description option. This
function could be copied and used to create a new function log.

The function used to create the log

is displayed in the Column
Description.

See Also

Log
Items

Crossplot

Post

Classed
Post

Log
Tab Commands