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Min of each row of a matrix and their indexes

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Babak MJ
Babak MJ 2016-8-21
回答： Andrei Bobrov 2016-8-21
I have the topography data in which I introduced X, Y, Z as follows. How can I find min for each row of Z data and find their X and Y value?

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Andrei Bobrov
Andrei Bobrov 2016-8-21
X=[11 13 15]
Y=[43 45 47]
Z = [27 25 21;35 38 37 ;42 47 49]
[~,ii] = min(Z,[],2)
out = [X(ii)',Y(:)]

更多回答（1 个）

Geoff Hayes
Geoff Hayes 2016-8-21
Babak - if you want to find the minimum of each row of Z then use min as follows
>> Z = [27 25 21; 35 38 37; 42 47 49];
>> min(Z,[],2)
ans =
21
35
42
To get the index of each of the above then do
>> [minValues, minIndices] = min(Z,[],2)
minValues =
21
35
42
minIndices =
3
1
1
Presumably, your x and y coordinates for these values would then be
X(minIndices)
Y(minIndices)

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