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Macro Reference
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8
Appendices
Vision System FH/FZ5 Series
User’s Manual (Z340)
Log
Gets the natural logarithm.
Format
Log(<expression>)
Parameter
Return value
Returns the natural logarithm value as a double precision real number.
Description
Gets the value of the natural logarithm of the expression specified in the <expression> parameter.
In the <expression> parameter, specify a positive number.
If an incorrect data type is specified for a parameter, a "Type mismatch" error will occur.
If a non-existent number, numerical value, or combination of data types or values is specified for a parameter,
an "Illegal function call" error will occur.
If a value is assigned to the return value variable or the variable is not used in an expression, a "Syntax error"
error will occur.
If the format is written incorrectly, such as writing the macro function name incorrectly, omitting a comma, or
omitting a half-width space, a "Syntax error" error will occur.
Usage Cautions
• None.
Example
Gets the natural logarithm of the integer 25 assigned to the variable X&.
The result is shown below.
Useable Modules
Unit Calculation Macro / Scene Control Macro / Communication Command Macro / Unit Macro
Supported Versions
Version 3.50 or later
Related Items
Parameter
name
Data type Description
<expression>
Integer type
Double
precision real
number data
type
Expression to get the natural logarithm
X& = 25
XLOG# = Log(X&)
XLOG# = 3.21887582487
Exp (Reference: X Details (p.520)) GetUnitData (Reference: X Details (p.552))
UnitData (Reference: X Details (p.778))
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