My Math Forum Finding a term in a graphing sequence.

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 September 13th, 2015, 12:20 PM #1 Newbie   Joined: Sep 2015 From: huddersfield Posts: 1 Thanks: 0 Finding a term in a graphing sequence. Hi. Maths has never really been my strong point...even with the chemistry degree to boot, anything over A-level required me to work hard and now, after 10 years, I have forgotten a lot of it! I am working on an electronic device for a camera of mine. I need it to trigger different shutter speeds in a sequence that tends to a final value of seconds via a certain number of shots. So my question is, how do I get the value for x in this case: xs starting value of x log2(y) - final value of x s number of terms ("shots"). I want x to increase proportionally to the limit log2(y) to give a smooth log base 2 like curve via the number of steps s. How can I get the value of x at point s when y,s and xs are all known. Thanks for any help! I assume this has something to do with a differentiation, a use of the x term at the start and a proportion...I have been playing in excel for the last 2 hours and can not replicate the smooth curve I am after .
 September 14th, 2015, 03:51 AM #2 Global Moderator   Joined: Dec 2006 Posts: 21,026 Thanks: 2257 What exactly did you mean by "increase proportionally to the limit"?

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