Campbell CR5000 Spécifications télécharger pdf (Page 173)

8-1

Section 8. Processing and Math

Instructions

Operators

^Raise to Power

* Multiply

/ Divide

+Add

- Subtract

= Equals

<> Not Equal

> Greater Than

< Less Than

>= Greater Than or Equal

<= Less Than or Equal

ABS (Source)

Returns the absolute value of a number.

Syntax

x = ABS (source)

Remarks

Source can be any valid numeric expression. The absolute value of a number

is its unsigned magnitude. For example, ABS(-1) and ABS(1) both return 1.

ABS Function Example

The example finds the approximate value for a cube root. It uses Abs to

determine the absolute difference between two numbers.

Dim Precision, Value, X, X1, X2 'Declare variables.

Precision = .00000000000001

Value = Volt(3) 'Volt(3) will be evaluated.

X1 = 0: X2 = Value 'Make first two guesses.

'Loop until difference between guesses is less than precision.

Do Until Abs(X1 - X2) < Precision

X = (X1 + X2) / 2

If X * X * X - Value < 0 Then 'Adjust guesses.

X1 = X

Else

X2 = X

End If

Loop

'X is now the cube root of Volt(3).

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Campbell CR5000 Spécifications Page 173