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Math Help - log scaled values

  1. #1
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    log scaled values

    Hi,

    I have a chart with a point that looks to be about halfway between 40 and 50, however that axis is log scaled. I'm guessing that it would be about 43.

    I want to draw a line that represents 45 on that axis, how should I do that?

    Cheers,

    T
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  2. #2
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    Quote Originally Posted by tolland View Post
    Hi,

    I have a chart with a point that looks to be about halfway between 40 and 50, however that axis is log scaled. I'm guessing that it would be about 43.

    I want to draw a line that represents 45 on that axis, how should I do that?

    Cheers,

    T
    log 50= 1.699 and log 40= 1.602, a difference of 0.097. log 45= 1.653 which is .051 larger than log 40 so 45 would be 0.051/0.097= 0.525 or about 53% of the way betwen 40 and 50.

    Oh, and half way between log 40 and log 50 is 1.6485= log 44.5.
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