Re: Using the HMS functions in a user RPL program.


"John H Meyers" <jhmeyers@xxxxxxx> answered to
> On Sat, 10 Dec 2005 03:42:38 -0600, Heiko Arnemann wrote:

> > The required program need additionaly take care,
> > if the user means hours, degrees or grad.
>
> The HMS conversions and HMS arithmetic functions
> are valid only for hours.mins_seconds or degrees.mins_seconds
> (not angles in grads or radians), but there is no way
....

Yes, I did not finish my thoughts. Of course, grads and radians
are decimals and need to be handled simply as real numbers (RND).

....

> > A case strukture with the faktors 24, 360 and 400

Here I was wrong. 24 h, 360 ° and 400 grad has nothing
to do with rounding, they only become important for
periodic analysis, e.g. with the MOD-function.

> > would take care for "0", and 3600 and 60 can be applied
> > for the digit rounding for 1 to 3.

> The format "xxxx.mmssssssssss" (as used by HMS functions)
> has a hard-coded definition (that there are 60 seconds
> to each minute, and 60 minutes to each degree or hour);
....
> My microwave oven does exactly the same, by the way,
> as do most of my digital countdown timers; you can specify
> 99 minutes, or 99 hours, or 99 seconds, and they never complain;
> they just count down to zero before affecting the next
> group of digits to the left (if any),
> and thus they do exactly the right thing for me, the user,
> who is, after all, always right :)

I like this way.

Thanks for your explanations/thougts.

Best regards
Heiko



.

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