How to calculate log(a/b) for each two rows at each column ?

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Jeevan Kumar Bodaballa
评论： John D'Errico 2020-5-25
I have a matrix mXn for example
a = 2 3 6 5 7 4
5 4 7 8 9 6
4 5 8 9 8 5
And from above 3X6 matrix i want to calculate log(second row/first rown) at each column
Then finally I will have 2X6 matrix
How can I solve for mXn matrix ?
I use this code
for i = 1:3
for j = 1:6
dlogd = log(a(i+1,j)/a(i,j));
end
end

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Ameer Hamza
Ameer Hamza 2020-5-25
编辑：Ameer Hamza 2020-5-25
a = ...
[2 3 6 5 7 4
5 4 7 8 9 6
4 5 8 9 8 5];
b = log(a(2:end, :)./a(1:end-1,:));
Result
>> b
b =
0.9163 0.2877 0.1542 0.4700 0.2513 0.4055
-0.2231 0.2231 0.1335 0.1178 -0.1178 -0.1823
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