Difference between revisions of "Uncumulate"
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[[Category:Array functions]] | [[Category:Array functions]] | ||
[[Category:Doc Status D]] <!-- For Lumina use, do not change --> | [[Category:Doc Status D]] <!-- For Lumina use, do not change --> | ||
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==Uncumulate(x, i, firstElement)== | ==Uncumulate(x, i, firstElement)== | ||
| − | Finds the difference between each element of | + | Finds the difference between each element of «x» and its predecessor along «i». |
| − | Uncumulate(x, i) returns an array whose first element (along | + | [[Uncumulate]](x, i) returns an array whose first element (along «i») is the first element of «x», and each other element is the difference between the corresponding element of «x» and the previous element of «x». |
| − | Uncumulate(x, i, firstElement) returns an array with the first element along | + | [[Uncumulate]](x, i, firstElement) returns an array with the first element along «i» equal to «firstElement», and each other element equal to the difference between the corresponding element of «x» and the previous element of «x». |
| − | Uncumulate(x, i) is the inverse of Cumulate(x, i). Uncumulate(x, i, 0) is similar to a discrete differential operator. | + | [[Uncumulate]](x, i) is the inverse of [[Cumulate]](x, i). [[Uncumulate]](x, i, 0) is similar to a discrete differential operator. |
==Examples== | ==Examples== | ||
| − | |||
The following example returns a table that shows an increase in the cost ownership of certain car types over a certain period of time. | The following example returns a table that shows an increase in the cost ownership of certain car types over a certain period of time. | ||
| − | <code>Uncumulate (Cost_of_ownership, Time)</code> | + | :<code>Uncumulate (Cost_of_ownership, Time) →</code> |
| − | {| | + | :{| class="wikitable" |
| − | ! !! colspan="5 | + | ! !! colspan="5" | Time ▶ |
|- | |- | ||
! style="width:100px;" |'''Car_type ▼ ''' | ! style="width:100px;" |'''Car_type ▼ ''' | ||
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The next example returns a table that shows the increase in the cost of ownership of cars compared to the previous time period and also sets the first value to 0. | The next example returns a table that shows the increase in the cost of ownership of cars compared to the previous time period and also sets the first value to 0. | ||
| − | <code>Uncumulate (Cost_of_ownership, Time, 0)</code> | + | :<code>Uncumulate (Cost_of_ownership, Time, 0) →</code> |
| − | {| | + | :{| class="wikitable" |
| − | ! !! | + | ! !! colspan="5" | Time ▶ |
|- | |- | ||
! style="width:100px;" |'''Car_type ▼ ''' | ! style="width:100px;" |'''Car_type ▼ ''' | ||
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==See Also== | ==See Also== | ||
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* [[Cumulate]] | * [[Cumulate]] | ||
* [[Array_Function_Example_Variables|Example variables]] | * [[Array_Function_Example_Variables|Example variables]] | ||
* [http://wiki.analytica.com/User_Guide_Examples User Guide Examples] / [http://wiki.analytica.com/Media:_Array_Function_Examples.ana Array Function Examples.ana] / Reducing Functions Module | * [http://wiki.analytica.com/User_Guide_Examples User Guide Examples] / [http://wiki.analytica.com/Media:_Array_Function_Examples.ana Array Function Examples.ana] / Reducing Functions Module | ||
__FORCETOC__ | __FORCETOC__ | ||
Revision as of 00:03, 16 January 2016
Uncumulate(x, i, firstElement)
Finds the difference between each element of «x» and its predecessor along «i».
Uncumulate(x, i) returns an array whose first element (along «i») is the first element of «x», and each other element is the difference between the corresponding element of «x» and the previous element of «x».
Uncumulate(x, i, firstElement) returns an array with the first element along «i» equal to «firstElement», and each other element equal to the difference between the corresponding element of «x» and the previous element of «x».
Uncumulate(x, i) is the inverse of Cumulate(x, i). Uncumulate(x, i, 0) is similar to a discrete differential operator.
Examples
The following example returns a table that shows an increase in the cost ownership of certain car types over a certain period of time.
Uncumulate (Cost_of_ownership, Time) →
Time ▶ Car_type ▼ 0 1 2 3 4 VW 2810 141 147 155 163 Honda 3535 312 50 269 199 BMW 3185 109 115 120 127
The next example returns a table that shows the increase in the cost of ownership of cars compared to the previous time period and also sets the first value to 0.
Uncumulate (Cost_of_ownership, Time, 0) →
Time ▶ Car_type ▼ 0 1 2 3 4 VW 0 141 147 155 163 Honda 0 312 50 269 199 BMW 0 109 115 120 127
See Also
- Cumulate
- Example variables
- User Guide Examples / Array Function Examples.ana / Reducing Functions Module
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