Code to determine a log of the mean for a column of numbers?

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Gregor Massie 2022-8-5

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评论： Walter Roberson 2022-8-8

I actually could do with code to produce the following -I have a dataset and need a results table presenting the log of the mean, maximum and average for four different columns of numbers. So for column 1 - log of the mean, 2 - maximum, 3 - average, 4 - average.

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dpb 2022-8-5

"for four different columns of numbers..."

So there are 4xN values total or just N?

And, what is

"for column 1 - log of the mean, 2 - maximum, 3 - average, 4 - average."

the duplicate of the last two intended to be?

Gregor Massie 2022-8-8

the duplicate is just another indice that we require the average for

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回答（1 个）

Les Beckham 2022-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/1774675-code-to-determine-a-log-of-the-mean-for-a-column-of-numbers#answer_1021755

在 MATLAB Online 中打开

A = magic(4)
A = 4×4
    16     2     3    13
     5    11    10     8
     9     7     6    12
     4    14    15     1
logmean_col1 = log(mean(A(:,1)))
logmean_col1 = 2.1401
max_col2 = max(A(:,2))
max_col2 = 14
mean_col3 = mean(A(:,3))
mean_col3 = 8.5000
mean_col4 = mean(A(:,4))
mean_col4 = 8.5000

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Gregor Massie 2022-8-8

编辑：Gregor Massie 2022-8-8

Thanks guys, thats great! I'm now looking for code to calculate the anitlog for the first column of numbers? I actually missed out this step, for the first column we calculatye the antilog for each number then work out the log of the mean for the whole column