HP -28S Quick Reference
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HP-28S
TRIG Menu
SIN Sine of a real or complex value.
ASIN Arcus sine of a real or complex value.
COS Cosine of a real or complex value.
ACOS Arcus cosine of a real or complex value.
TAN Tangent of a real or complex value.
ATAN Arcus tangent of a real or complex value.
P→R
Converts real or complex number or a vector in stack level 1 from polar to
rectangular coordinates:
• real X → (x, 0)
• (r, θ) → (x, y)
• [r θ …] → [x y …]
If the vector contains more than 2 elements only the first two are converted
and the other elements are left unchanged. This is useful when handling
3-dimensional [r θ z] vectors.
The current angle mode (degrees or radians) determines the units of θ.
R→P
Converts a complex number or a vector in stack level 1 from rectangular to
polar coordinates. See P→R for details.
R→C
Combine two real numbers into a complex number.
The value in level 1 will be the imaginary part.
C→R
Split a complex number into two real numbers in stack level 1 and 2.
Level 1 will receive the imaginary part.
ARG
Return the angle θ of the complex number (x,y) vector with the x-axis.
• X≥0: θ=atan x/y
• X<0: θ=atan x/y + π*sign(y)
→HMS
Convert a number from fractional hours format to HMS format.
HMS numbers are displayed in the format H.MMSSs where H are hours, MM
are minutes (60 per hour), SS are seconds (60 per minute) and s are
fractional seconds.
Note: This format may not match the coodinate format used in GPS devices
where SS is not seconds but fractional minutes!! Use the following two
programs to convert to and from HM format:
<<DUP IP SWAP FP 0.6 * +>> '→HM' STO
<<DUP IP SWAP FP 0.6 / +>> 'HM→' STO
HMS→
Convert a number form HMS format to fractional hours.
HMS+ Add two numbers given in HMS format.
HMS- Substract numbers given in HMS format.
D→R Convert degress (360) to radians (2π)
R→D Convert radians (2π) to degress (360)
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