Texas Instruments TITANIUM TI-89 User Manual

Page 534

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Data/Matrix Editor

534

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.

c2=shift(c1,2)

c3=shift(c1,

Shifted columns have the same length as the base

Last two elements of c1 shift down and out the

bottom; undefined elements shift into the top.

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)

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