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Re: Data visualisation.

by Laurent_R (Abbot)
on Jan 02, 2014 at 19:04 UTC ( #1069007=note: print w/replies, xml ) Need Help??


in reply to Data visualisation.

Hi,

what about something along these lines. Set A to coordinates (0,0) and B to coordinates (0, 633).

Say C has coordinates (x, y).

You have:

sqrt (x + y) = 257 sqrt(x + (633 - y)) = 390
Solving this system of two equations is straight forward. (Hoping I did not goof the maths ;-) For the next points, one needs to be a bit more general and use the distances to A, B and C.

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[atcroft]: james28909: What about October 5, 1582?
[stevieb]: atcroft: "Make both hands into fists..."... is something my Ma taught me in our native lang, but I was to ignorant and young to pay attention. Thanks for that :)
[atcroft]: stevieb: Sad to say that I only recently learned that particular trick, but I have since found it very useful.... :)
[james28909]: ill be back with a solution eventually
[stevieb]: it's a reminder to re-inforce it :P
[atcroft]: james28909: That particular questions was a bit of trick, actually (depending on the country you are in). More interesting is, if you are trying to subtract from an epoch time, for instance, you might have to consider when/if DST occurs for a location,
[atcroft]: because you may have to adjust the number of seconds you change from an epoch from 86400 (not to mention leap seconds)....
[atcroft]: james28909: Although if your program is using a database, you might be able to "pass the buck" to the database and ask it to do the date change for you....

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