Difference between revisions of "Manuals/calci/FACTDOUBLE"
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| − | <div | + | <div style="font-size:30px">'''FACTDOUBLE(Number)'''</div><br/> |
| + | *<math>Number</math> is a positive integer whose double factorial is to be found. | ||
| + | **FACTDOUBLE(), returns the double factorial of a number. | ||
| − | |||
| − | + | == Description == | |
| − | |||
| − | |||
| − | + | FACTDOUBLE(Number) | |
| − | + | e.g. FACTDOUBLE(6) displays '''48''' as a result. | |
| − | |||
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| − | + | *<math>Number</math> should be a positive integer. | |
| + | *The factorial of an even number is calculated as - | ||
| − | < | + | <math>N!! = N * (N-2) * (N-4) * .....4 * 2</math> |
| − | -- | + | *The factorial of an odd number is calculated as - |
| − | |||
| − | - | ||
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| − | < | + | <math>N!! = N * (N-2) * (N-4) * .....3 * 1</math> |
| + | *If <math>Number</math> is negative, Calci displays #N/A error message. | ||
| + | *If <math>Number</math> is not an integer, it is truncated to calculate the double factorial. | ||
| + | *If <math>Number</math> is invalid, Calci displays #NULL error message. | ||
| + | *The double factorial of series of numbers can be calculated as - | ||
| + | e.g. FACTDOUBLE(1..5) calculates double factorial of numbers from 1 to 5 and displays result as '''1 2 3 8 15'''. | ||
| − | + | == Examples == | |
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| − | + | <div id="6SpaceContent" class="zcontent" align="left"> | |
| + | |||
| + | {| id="TABLE3" class="SpreadSheet blue" | ||
| + | |- class="even" | ||
| + | | class=" " | '''Function''' | ||
| + | | class=" " | '''Output''' | ||
| + | |||
| + | |- class="odd" | ||
| + | | class="sshl_f" |FACTDOUBLE(7) | ||
| + | | class="sshl_f" |105 | ||
| − | + | |- class="even" | |
| − | + | | class="sshl_f" |FACTDOUBLE(0) | |
| − | + | | class="sshl_f" |1 | |
| − | + | |- class="odd" | |
| + | | class="sshl_f" |FACTDOUBLE(4.2) | ||
| + | | class="sshl_f" |8 | ||
| − | + | |- class="even" | |
| + | | class="sshl_f" |FACTDOUBLE(8) | ||
| + | | class="sshl_f" |384 | ||
| + | |} | ||
| − | + | ==Related Videos== | |
| − | + | {{#ev:youtube|v=XbFpuC86ouQ|280|center|FACTDOUBLE}} | |
| − | + | == See Also == | |
| − | + | *[[Manuals/calci/FACT | FACT]] | |
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| − | + | ==References== | |
| − | + | *[http://en.wikipedia.org/wiki/Double_factorial Double Factorial] | |
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| − | + | *[[Z_API_Functions | List of Main Z Functions]] | |
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| − | + | *[[ Z3 | Z3 home ]] | |
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Latest revision as of 14:51, 20 November 2018
FACTDOUBLE(Number)
- is a positive integer whose double factorial is to be found.
- FACTDOUBLE(), returns the double factorial of a number.
is a positive integer whose double factorial is to be found.
Description
FACTDOUBLE(Number)
e.g. FACTDOUBLE(6) displays 48 as a result.
- should be a positive integer.
- The factorial of an even number is calculated as -
- The factorial of an odd number is calculated as -
- If is negative, Calci displays #N/A error message.
- If is not an integer, it is truncated to calculate the double factorial.
- If is invalid, Calci displays #NULL error message.
- The double factorial of series of numbers can be calculated as -
e.g. FACTDOUBLE(1..5) calculates double factorial of numbers from 1 to 5 and displays result as 1 2 3 8 15.
Examples
| Function | Output |
| FACTDOUBLE(7) | 105 |
| FACTDOUBLE(0) | 1 |
| FACTDOUBLE(4.2) | 8 |
| FACTDOUBLE(8) | 384 |
Related Videos
See Also
References