30 Section 2: Numeric Functions
For example, to find the sales tax at 3% and total cost of a $15.76 item:
Percent Difference. The ∆ function calculates the percent difference
between two numbers. The result expresses the relative increase (a positive
result) or decrease (a negative result) of the second number entered
compared to the first number entered.
For example, suppose the $15.76 item only cost $14.12 last year. What is
this
Polar and Rectangular Coordinate Conversions
The : and ; functions are provided in the
HP-15C for conversions between polar
coordinates and rectangular coordinates. The
degrees (in a decimal format, not a minutes-
seconds format), radians, or grads. θ is
measured as shown in the illustration at right.
Polar Conversion. Pressing |:
(polar) converts a set of rectangular coordinates (x, y) to polar coordinates
(magnitude r, angle θ). The y-value must be entered first, the x-value
second. Upon executing |: r will appear in the display. Press ®
(X exchange Y) to bring θ out of the Y-register and into the display (X-
register). θ will be returned as a value between -180° and 180°, between -
and radians, or between -200 and 200 grads.
To Next Page
Loading...
Need help?
General
