Texas Instruments TI89TITANIUM User Manual - Page 533
Using Shift and CumSum Functions in a Column Header, Auto-calculate = OFF, cumSum, shift
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If Auto-calculate = OFF and you make changes as described above, the header definitions are not recalculated until you set Auto-calculate = ON. Note: You may want to set Auto-calculate = OFF to make changes without recalculating each time, enter a definition such as c1=c2+c3 before you enter columns 2 and 3, or override any errors in a definition until you can debug the error. Using Shift and CumSum Functions in a Column Header When defining a column header, you can use the shift and cumSum functions as described below. These descriptions differ slightly from the Technical Reference module. This section describes how to use the functions in the Data/Matrix Editor. The Technical Reference module gives a more general description for the Home screen or a program. Using the Shift Function The shift function copies a base column and shifts it up or down by a specified number of elements. Use † to define a column header with the syntax: shift (column [,integer]) Ê Ë Ê Column used as the base for the shift. Ë Number of elements to shift (positive shifts up; negative shifts down). Default is M1. For example, for a two-element shift up and down: Data/Matrix Editor 533