HP 15C User Manual download pdf (Page 57)

Section 4: Statistics Functions 57

Keystrokes

Display

70 ´j

7.56

Predicted grain yield in tons/hectare.

0.99

The original data closely approximates a

straight line.

Other Applications

Interpolation. Linear interpolation of tabular values, such as in

thermodynamics and statistics tables, can be carried out very simply on the

HP-15C by using the j function. This is because linear interpolation is

linear estimation: two consecutive tabular values are assumed to form two

points on a line, and the unknown intermediate value is assumed to fall on

that same line.

Vector Arithmetic. The statistical accumulation functions can be used to

perform vector addition and subtraction. Polar vector coordinates must be

converted to rectangular coordinates upon entry (θ, v, r ;, z).

The results are recalled from R



l z) and

converted back to polar coordinates, if necessary. Remember that for polar

coordinates the angle is between -180° and 180° (or - radians, or -

200 and 200 grads). To convert to a 

to the angle.

For the second vector entered, the final keystroke will be either z or

w, depending on whether the two vectors should be added or subtracted.

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HP 15C User Manual Page 57