MATLAB: Accumulate in multiple array

averageunique

I have:

Temperature profiles array for 5 days. such that, temp(heigth,day). however, there are multiple profile in some days which makes the number of profile equal 11.

size of temp = (3650 by 11)

size of day = (1 by 11)

day=[1,1,1,2,2,3,3,3,4,4,5].

I want to:

average temperature for every similar days

such that:

dailyday=[1,2,3,4,5]

temp=(3650 by 5)

Best Answer

splitapply(@(x) mean(x,2),Temp,findgroups(Day))

Related Solutions

MATLAB: Calculate statistical parameters from certain rows of a matrix

Wanted=splitapply(@mean,x(:,2),findgroups(x(:,1))) % x(:,1) is Day and x(:,2) is Temperature
% or if you're using version prior to 2015b then:
Wanted=accumarray(Day,Temperature,[],@mean);

For only one day it’s simply:

day = 1;
mean(Temperature(Day==day))

MATLAB: How to use for loop to reduce the number of lines from the following code

This is MATLAB, so here is a much simpler solution without any loops:

M  = C1(1:399,5:11);
R  = mean(permute(M,[3,2,1]).*permute(M,[2,3,1]),3);
R0 = mean(M.*C1(1:399,13),1).';
B  = pinv(R)*(R0)

And compared against the output of your code:

>> isequal(A,B)
ans = 1

For MATLAB versions prior to R2016b you will need replace the .* operators with bsxfun and times.

Best Answer

Related Solutions

MATLAB: Calculate statistical parameters from certain rows of a matrix

MATLAB: How to use for loop to reduce the number of lines from the following code

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