Texas Instruments Titanium TI-89, Руководство пользователя

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Data/Matrix Editor 519
Note:
To enter shift, type it from the keyboard or select it from the CATALOG.
Using the CumSum Function
The
cumSum
function returns a cumulative sum of the elements in a base column. Use
†
to define a column header with the syntax:
For example:
Note:
To enter
cumSum
, type it, select it from the CATALOG, or press
2 I
and
select it from the List submenu.
Ê Ë
Ì
Í Î
Ê
c2=shift(c1,2)
Ë
c3=shift(c1, M 2)
Ì
Shifted columns have the same length as the base
Í
Last two elements of c1 shift down and out the
bottom; undefined elements shift into the top.
Î
First two elements of c1 shift up and out the top;
undefined elements shift into the bottom.
cumSum ( column )
Column used as the base for the cumulative sum.
1+2
1+2+3+4
c2=cumSum(c1)