Campbell CR800 Specifications download pdf (Page 219)

Section 8. Processing and Math Instructions

Dim A, B, C, D 'Declare variables.

BeginProg

A = Int(-99.8) 'Returns -100

B = Fix(-99.8) 'Returns -99

C = Int(99.8) 'Returns 99

D = Fix(99.8) 'Returns 99

EndProg

Ln (Source)

Log (Source)

Returns the natural logarithm of a number. Ln and Log perform the same

function.

Syntax

x = Log (source)

x = Ln (source)

Remarks

The source can be any valid numeric expression that results in a value greater

than 0. The natural logarithm is the logarithm to the base e. The constant e is

approximately 2.718282.

You can calculate base-n logarithms for any number x by dividing the natural

logarithm of x by the natural logarithm of n as follows:

Logn(x) = Log(x) / Log(n)

The following example illustrates a procedure that calculates base-10

logarithms:

Log10 = Log(X) / Log(10)

Log Function Example

The example calculates the value of e, then uses the Log function to calculate

the natural logarithm of e to the first, second, and third powers.

Dim I, M 'Declare variables.

BeginProg

M = Exp(1)

For I = 1 To 3 'Do three times.

M =Log(Exp(1) ^ I)

Next I

EndProg

LOG10 (number)

The LOG10 function returns the base 10 logarithm of a number.

Syntax

x = LOG10 (number)

Remarks

The LOG10 function returns the logarithm base 10 of a number.

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Campbell CR800 Specifications Page 219