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Math Help - Margalef Species Richness...

  1. #1
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    Margalef Species Richness...

    Margalef's richness index: (S-1)/ln(n), where S is the number of taxa, and n is the number of individuals.
    Hi all, this may seem pretty simple to you all, but I admit that when it comes to numbers I struggle.
    Please correct me where I (may) be getting this wrong:

    [(S-1)/ln] x n = answer
    My struggling point is, what is 'ln' I can't seem to find this anywhere (is it simply 1-n?).
    Thanks for your help!
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  2. #2
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    Quote Originally Posted by nurglespuss View Post
    Margalef's richness index: (S-1)/ln(n), where S is the number of taxa, and n is the number of individuals.
    Hi all, this may seem pretty simple to you all, but I admit that when it comes to numbers I struggle.
    Please correct me where I (may) be getting this wrong:

    [(S-1)/ln] x n = answer
    My struggling point is, what is 'ln' I can't seem to find this anywhere (is it simply 1-n?).
    Thanks for your help!
    Hi,
    the formula is \frac{S-1}{\ln n}=\frac{S-1}{\ln(n)}. The " \ln" is a function called the natural logarithm. You can find this function on scientific calculators (usually, it is on the same key as \exp).
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  3. #3
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    Ahhhh my brain finally works, its not 1n its ln (log).
    Cheers :>

    Quote Originally Posted by nurglespuss View Post
    Margalef's richness index: (S-1)/ln(n), where S is the number of taxa, and n is the number of individuals.
    Hi all, this may seem pretty simple to you all, but I admit that when it comes to numbers I struggle.
    Please correct me where I (may) be getting this wrong:

    [(S-1)/ln] x n = answer
    My struggling point is, what is 'ln' I can't seem to find this anywhere (is it simply 1-n?).
    Thanks for your help!
    Follow Math Help Forum on Facebook and Google+

  4. #4
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    Assignment woes

    hi all,

    I was hoping you could tell me the which button I should be pushing on my calculator for the Margalef species richness index.

    I have both the Log and In buttons on my calcualtor

    is it correct if I type in S-1/Log(n
    or is it S-1/In(n

    thanks in advance

    Adrian
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  5. #5
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    Quote Originally Posted by AdrianWool View Post
    hi all,

    I was hoping you could tell me the which button I should be pushing on my calculator for the Margalef species richness index.

    I have both the Log and In buttons on my calcualtor

    is it correct if I type in S-1/Log(n
    or is it S-1/In(n

    thanks in advance

    Adrian
    ln, that is, the log to base e button.


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