HP Forum Archive 14

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->HR <-> ->HMS Message #1 Posted by Gileno on 1 Sept 2004, 10:02 p.m. I need the equation to convert ->HR <-> ->HMS. Thank you !!!

Re: ->HR <-> ->HMS Message #2 Posted by Brent on 1 Sept 2004, 10:33 p.m., in response to message #1 by Gileno I don't believe there is an equation, just some steps you you have to follow: -write down the degrees -take the fractional part and multiply by 60 -the whole number is the minutes -take the new fractional part and multiply by 60 -the whole number is the seconds and the fractional part is the fractional seconds. There should be a button to do all this on a good calculator. Edited: 1 Sept 2004, 10:34 p.m.

Re: ->HR <-> ->HMS Message #3 Posted by Cyril RABIH on 2 Sept 2004, 9:04 a.m., in response to message #1 by Gileno Hi man, if you really want to have a single équation, I show you what I've found during the last 15 minutes. H->HMS f(x)=IP(x)+(1/100)*IP(60.FP(x))+(1/10000)*IP(3600*(FP(x)-(1/60)*IP(60*FP(x)))) HMS->H f(x)=IP(x)+(1/60)*IP(100*FP(x))+(1/3600)*IP(10000*(FP(x)-(1/100)*IP(100*FP(x)))). You must enter 15h28mn15s as 15.2815 I've tried it with some examples and I think it's ok. I hope it will help you. Edited: 2 Sept 2004, 9:19 a.m.

Re: ->HR <-> ->HMS Message #4 Posted by bill platt on 2 Sept 2004, 9:24 a.m., in response to message #1 by Gileno Also, compare to the equation I wrote in a previous post: http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv014.cgi?read=61505 Edited: 2 Sept 2004, 10:48 a.m.

Re: ->HR <-> ->HMS Message #5 Posted by Gileno on 2 Sept 2004, 7:57 p.m., in response to message #4 by bill platt Thank you

Re: ->HR <-> ->HMS Message #6 Posted by bill platt on 3 Sept 2004, 1:06 p.m., in response to message #5 by Gileno You are welcome! BTW, I had too many parenthesis: It should be: H.MS-->HR: (FP(100*A)/0.6+IP(FP(A)*100))/60+IP(A) And Also, here is my solution t'other way 'round: HR-->H.MS: IP(x)+IP(FP(x)*60/100+FP(FP(x)*60)*60/10000 Note that the precedence rules of the above text is as per the HP48 series. These are nice and compact. Best regards, Bill

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