Calculate mean of matrix for specific interval

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Pelle Adema 2021-9-2

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https://ww2.mathworks.cn/matlabcentral/answers/1445279-calculate-mean-of-matrix-for-specific-interval

评论： Pelle Adema 2021-9-2

采纳的回答： Konrad

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Hi all,

I have elevation data stored in a 121x721 matrix called DEM.

I want to calculate 2 things:

1) the cross-sectionally averaged mean elevation along the flume. i.e. the mean elevation per column of matrix DEM. (This works OK)

2) The cross-sectionally averaged mean elevation along the flume for DEM(11:110). So without the edges. (Does not work yet)

My code works for the first but not for the second thing I try to calculate.

See the minimal working example below to see the code I used.

What I need is a 1x721 array of the mean value of columns in DEM between 11 and 110.

Hope this makes sense and someone can point me in the right direction.

Thanks

%% MWE 
% DEM contains a digital elevation model (elevation data). 
DEM = rand(121,721);
% calcultate DEM means for full DEM  
DEM_mean = mean(DEM); % this returns a 1x721 array which is what I need 
% calculate DEM means for specific interval of DEM 
DEM_mean2 = mean(DEM,11:110); % this returns a 121x721 matrix, but I need a 1x721 array like above. 