How do I use my data set in an equation?

Question

Lucas 2024-4-23

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https://ww2.mathworks.cn/matlabcentral/answers/2110826-how-do-i-use-my-data-set-in-an-equation

回答： Walter Roberson 2024-4-23

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.

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Answer 1

Torsten 2024-4-23

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https://ww2.mathworks.cn/matlabcentral/answers/2110826-how-do-i-use-my-data-set-in-an-equation#answer_1446621

编辑：Torsten 2024-4-23

在 MATLAB Online 中打开

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.