Difference between revisions of "RAND()"
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==Purpose== | ==Purpose== | ||
Function to return a random number | Function to return a random number | ||
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==Syntax== | ==Syntax== | ||
RAND([<expN>]) | RAND([<expN>]) | ||
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==See Also== | ==See Also== | ||
| − | [[GETPID()]], [[TMPNAM() | + | [[GETPID()]], [[TMPNAM()]], [[SYS()]] |
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==Description== | ==Description== | ||
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With SET COMPATIBLE set to FOXPRO | FOXBASE | VFP the number range is between 0 and 1 and a seed can be specified in <expN>. Using the same positive value in <expN> and omitting it in subsequent calls to the RAND() function will return the same sequence of numbers. Using a negative value in <expN> creates a seed based on the system clock, so subsequent RAND() calls will produce a different sequence of values. | With SET COMPATIBLE set to FOXPRO | FOXBASE | VFP the number range is between 0 and 1 and a seed can be specified in <expN>. Using the same positive value in <expN> and omitting it in subsequent calls to the RAND() function will return the same sequence of numbers. Using a negative value in <expN> creates a seed based on the system clock, so subsequent RAND() calls will produce a different sequence of values. | ||
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==Example== | ==Example== | ||
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</code> | </code> | ||
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[[Category:Documentation]] | [[Category:Documentation]] | ||
[[Category:Functions]] | [[Category:Functions]] | ||
[[Category:Numeric Data]] | [[Category:Numeric Data]] | ||
[[Category:Numeric Data Functions]] | [[Category:Numeric Data Functions]] | ||
Revision as of 08:07, 10 February 2012
Contents
Purpose
Function to return a random number
Syntax
RAND([<expN>])
See Also
Description
The RAND() function returns a number in the range 1 to 2147483647. Subsequent calls to RAND() will produce different numbers, but the sequence of numbers will be the same each time.
With SET COMPATIBLE set to FOXPRO | FOXBASE | VFP the number range is between 0 and 1 and a seed can be specified in <expN>. Using the same positive value in <expN> and omitting it in subsequent calls to the RAND() function will return the same sequence of numbers. Using a negative value in <expN> creates a seed based on the system clock, so subsequent RAND() calls will produce a different sequence of values.
Example
? rand() 31466 set compatible to foxpro ? rand(-1) 0.66 ? rand() 0.73
