HP -28S Quick Reference
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HP-28S
columns. The column numbers for the dependent (y(x)) and independent (x)
set of values are specified in ∑PAR and can be modified using COL∑.
The return value is the y-offset of the best-fit line in stack level 1 and the
slope in level 2.
The returned values are also stored in the ∑PAR list at positions 3 and 4 for
later reference by PREDV.
Other types of curve fits (exponential, logarithmic, etc.) can easily be
implemented by user programs operating on ∑DAT.
PREDEV Takes the x value from stack level 1 and calculates a prediction y(x) according
to the linear coefficients that were calculated by LR.
UTPC Upper-tail Probability Chi-square Distribution UTPC(n,x).
This function and the following ones do not operate on statistics data.
UTPF Upper-tail Probability F Distribution UTPF(n1,n2,x)
UTPN Upper-tail Probability Normal Distribution UTPN(m,v,x)
UTPT Upper-tail Probability t-Distribution utp(n,x)
COMB
Combinations C(x,y) = Y! / [X! • (Y-X)!]
Number of possibilities to select X elements from a group of Y different
elements where different sequences
do not
count separately:
10 2 COMB returns 45. There are 45 possibilities to draw two elements from
a group of 10 different elements if the order of the two drawn elements does
not matter.
PERM Permutations P(x,y) = Y! / (Y-X)!
Number of possibilities to select X elements from a group of Y different
elements where different sequences count separately.
10 2 COMB returns 90. There are 90 possibilities to draw two elements from
a group of 10 different elements if the order of the drawn elements does
matter.
PRINT Menu
General • The HP-28S works in conjunction with the thermal printer HP-82240A.
• To print the current contents of the LCD: Hold down "ON", then press
"L" (it has the PRINT menu associated with it), release "ON".
This produces the same output as PRLCD.
Print flags • Flag 33: Usually, every print command sends a trailing CR which
triggers the immediate printout of the data. If flag 33 is set, data is
collected in the printer's input buffer (max. 200 characters) and
printed only after sending a CR (4dec) or LF (10dec). Note that the
printer needs about 1.8 seconds to print one line so do not send data
too fast.
• Flag 47: When set a blank line is printed after every printout.
• Flag 52: Activates the "fast print mode". It should only be set when
the printer is operated with an external power supply!
Escape chars Escape characters can be used for special print effects.
The escape code is 27 or 0x1B.
• 27 001…166 Print graphics characters.
• 27 250 Underline off.
• 27 251 Underline on.
• 27 252 Normal print width (24 characters).
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