How to use one data set to find the mean of another?

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Kristin Aldridge
Kristin Aldridge 2021-8-31
评论： Kristin Aldridge 2021-9-1
I have a data set (neighbors) and a data set (height) where I need to find the mean of the height of the plants that have 1 neighbor.
If say my Neighbors data set is 2,1,4,1,6,7,3,1 and my height is 12.5,17,10,4,16,20.4,13.2,9.4 . How do I compare these two? My thought is to use NON=find(Neighbors==1) and somehow use the designated spots to correlate it to height, but I don't know how. Please let me know if there is another way to do this. I've only been using Matlab for 1 week and have been using youtube a lot for help. Thanks.
NON=NumberOfNeighbors
PLCm=PlantHeightcm
find PLCm when NON=1
Error using find
Second argument must be a positive scalar integer.

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采纳的回答

Chunru
Chunru 2021-9-1
编辑：Chunru 2021-9-1
Ran in:
neighbors = [2,1,4,1,6,7,3,1];
height = [12.5,17,10,4,16,20.4,13.2,9.4 ];
% find the entries with 1 neighbour
idx = neighbors == 1;
% use logic index to get the heights with 1 neigbour and find mean
a = mean(height(idx))
a = 10.1333
% or in one line
a = mean(height(neighbors==1))
a = 10.1333

更多回答（1 个）

Jeff Miller
Jeff Miller 2021-9-1
NON1 = NON == 1; % this makes a boolean vector that is true for the positions where NON==1
mean(PLCm(NON1)); % this computes the mean of the PLCm values in those positions

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