OLD Texas Pgm

[LEGRAND]

I find the following formula from an old Texas pgr for TI 59

havD =hav(Ls-Ld)cos(ls).cos(ld)+hav(ls-ld)

For your info, ls,ld are the starting and destination latitudes,
while Ls and Ld are the starting and destination longitudes
D is the great circle distance

I want to write that in basic but what the hell this "hav" can mean?
Can somebody explains? Thanks in advance.

[bongomeno]

wow, a TI-59? NICE!

I only know TI BASIC for the 8X series, but most of the people here only know Qbasic or similar.

havD is probably a special variable that when changes, you get some special output. like on a graphing calc, you can change variables that affect the graph output.

I dont really know anything about it though...

[LEGRAND]

Thanks for answer. I thought the meaning was something like absolute value but apparently no. h for hemispherical? no something about graph y'are right.

[burger2227]

Try hexadecimal value: &HD in Qbasic

A = 10
B = 11
C = 12
D = 13
E = 14
F = 15

1 thru 9 are normal decimal values based on 0 thru 15 or 16 digits.