Table 2-11 Annunciators and status

Annunciator

Status

 

 

FUNC

A math error has occurred (for example, division by zero).

 

 

Input Key

The Ækey is used to separate two numbers when using two-number functions or two-

variable statistics. The Ækey can also be used to enter cash flows and cash flow counts, ordered pairs, and evaluate any pending arithmetic operations, in which case the result is the

same as pressing 4.

Swap Key

Pressing \«exchanges the following:

•The last two numbers that you entered; for instance, to change the order of division or subtraction.

•The results of functions that return two values.

The «key toggles the item in the Æregister, or swaps the top two items in the

mathematical stack. This function is used to retrieve a secondary value returned during a calculation, as well as to swap two items during a calculation.

Statistics Keys

The statistics keys are used to access summary statistics from the statistics memory registers.

When you press ]followed by a statistics key, you can recall one of six summary statistics with the next keystroke.

For example, press ]followed by the Xkey to recall the sum of the x-values entered.

Table 2-12 Statistics keys

Keys

Description

 

 

]l

Sum of the squares of the x-

values.

 

 

]i

Sum of the squares of the y-

values.

 

 

]f

y-values.

 

Sum of the products of the x- and

 

 

][

Number of data points entered.

 

 

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