Difference between revisions of "RAND()"
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==Purpose== | ==Purpose== | ||
Function to return a random number | Function to return a random number | ||
| Line 11: | Line 4: | ||
==Syntax== | ==Syntax== | ||
| − | RAND(<expN>) | + | RAND([<expN>]) |
==See Also== | ==See Also== | ||
| − | [[ | + | [[GETPID()]], [[TMPNAM()]], [[SET COMPATIBLE]], [[SYS()]] |
==Description== | ==Description== | ||
| − | The RAND() function returns a | + | 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. | ||
| Line 26: | Line 21: | ||
? rand() | ? rand() | ||
31466 | 31466 | ||
| + | |||
| + | set compatible to foxpro | ||
| + | ? rand(-1) | ||
| + | 0.66 | ||
| + | ? rand() | ||
| + | 0.73 | ||
</code> | </code> | ||
==Products== | ==Products== | ||
| − | Recital | + | Recital, Recital Server |
[[Category:Documentation]] | [[Category:Documentation]] | ||
[[Category:Functions]] | [[Category:Functions]] | ||
| + | [[Category:Numeric Data]] | ||
| + | [[Category:Numeric Data Functions]] | ||
Latest revision as of 15:05, 7 December 2009
Purpose
Function to return a random number
Syntax
RAND([<expN>])
See Also
GETPID(), TMPNAM(), SET COMPATIBLE, SYS()
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
Products
Recital, Recital Server
