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172

Dran-View 6 User Guide

13.10.1. Math Channel Formula Editor

Math

Channel

Formula

Editor

Enterprise

Edition

Only

This dialog box is used to create and edit

math channels.

Terms An Operator is an expression that does something to Operands.

+,-,*,/ are examples of operators.

10, [Site 1.A-NVrms.VAL], SQRT(2) are examples of operands.

Functions are generally regarded as operators but since by syntax they behave as

operands (as complete expressions), they are categorized as operands in this text.

Parameters are data that go into functions.

The expression MOD([Site 1.A-NV.VAL];2.0) has two parameters, "[Site 1.A-

NV.VAL]" and "2.0".

Formula

Editor

Formula Edit Box

At the top of the page, you will find a text box where the

formula is displayed. You can edit this text manually if you

wish to do so.

Warnings This frame may contain messages concerning errors in the

formula. The error messages have the following causes:

Message Cause

No channel selected You pressed the "Add" button below the channels list without first selecting

an item in the list.

No function selected

You pressed the "Add" button below the functions list without first selecting

an item in the list.

Illegal recursion The formula uses some other user-defined formula. A user-defined formula

may consist of a combination of pre-defined formulas.

Invalid site A channel operand specifies a site that cannot be found.

Channel X not found

A channel operand specifies a channel that cannot be found.

Invalid channel

definition

A channel operand specifies a series of code that does not exist. Valid values

are "VAL" , "MIN", "AVG", and "MAX".

Unexpected X There are two consecutive operands, two consecutive operators, an

unmatched right parenthesis, or an erroneous number of parameters given a

function in your formula.

Incomplete number You have not typed anything after a "." or an "e" following a number.

Unknown function X

You have entered an unknown text string.

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