How do I use my data set in an equation?

I have a 4145x6 data set collected by a fNIRS device. I need to use the formula log(Ib/Im). Ib is a mean value of 6 values, so a 1x6 data set, and Im is the 4145x6 data set. How would I solve this equation in matlab.

Answer 1

[Torsten]

Say lm is 2x6, e.g.

lb = [1 2 3 4 5 6]

lb = 1x6

1 2 3 4 5 6

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lm = [7 8 9 10 11 12;13 14 15 16 17 18]

lm = 2x6

7 8 9 10 11 12 13 14 15 16 17 18

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What would you like to compute ?

[log(1/7) log(2/8) log(3/9) log(4/10) log(5/11) log(6/12);log(1/13) log(2/14) log(3/15) log(4/16) log(5/17) log(6/18)]

ans = 2x6

-1.9459 -1.3863 -1.0986 -0.9163 -0.7885 -0.6931 -2.5649 -1.9459 -1.6094 -1.3863 -1.2238 -1.0986

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?

Then

log(lb./lm)

ans = 2x6

-1.9459 -1.3863 -1.0986 -0.9163 -0.7885 -0.6931 -2.5649 -1.9459 -1.6094 -1.3863 -1.2238 -1.0986

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would work.

Answer 2

[Walter Roberson]

lb = mean(lm,1);
formula = log(lb./lm);