Finding the max value in a vector

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Hi guys, I am having some trouble finding the highest value and its Index in a vector. Bellow is my code, I am having trouble in the line:
[V,M]=max(SUB,{},'omitnan')
The last value from "SUB"is:
Columns 1 through 7
[] [NaN] [13.6623] [-42.7241] [191.0598] [-6.5336] [-33.3556]
Columns 8 through 10
[-62.5169] [113.4669] [-24.7364]
That is why it is necessary to use 'omitnan'.
Thanks in Advance !
%importar dados do excel
imp = xlsread('Academia.xlsx');
%%Loop Kmeans K clusters
k=10
% eva = evalclusters(x,clust,criterion)
for i=1:k
[idx,C]=kmeans(imp,i);
M{i}=idx;
% y=xlswrite('Academia.xlsx',idx,'D1:D80')
eva = evalclusters(imp, idx, 'CalinskiHarabasz')
CH{i}=eva.CriterionValues
end
% % Descobrir as diferenças entre os valores de CH
while i>1
SUB{i}=CH{i}-CH{i-1}
i=i-1;
end
%Achar o pulo maximo entre os clusters para o valor de CH:
[V,M]=max(SUB,{},'omitnan')

Accepted Answer

Walter Roberson
Walter Roberson on 14 Feb 2016
You do not have a numeric vector, you have a cell array. You cannot use max() on a cell array.
You could consider using cell2mat() to construct a numeric array, and calculate the maximum of that, but then you are left with the question of whether the empty SUBS{1} should be counted as taking up a space or not.
Is there a reason you are storing SUBS as a cell array and not as a numeric array initialized to infinity ?

More Answers (1)

Geoff Hayes
Geoff Hayes on 14 Feb 2016
Edited: Geoff Hayes on 14 Feb 2016
Gabriel - according to max input arguments, a cell array is not a valid input to this function. Are you observing the error
Undefined function 'max' for input arguments of type 'cell'.
If this is the case, then try converting the cell array to a matrix using cell2mat as
[V,M]=max(cell2mat(SUB));
where
V =
191.0598
M =
4
  5 Comments
Walter Roberson
Walter Roberson on 15 Feb 2016
I wrote before "You could consider using cell2mat() to construct a numeric array, and calculate the maximum of that, but then you are left with the question of whether the empty SUBS{1} should be counted as taking up a space or not." but you did not answer that.
Gabriel
Gabriel on 21 Feb 2016
Sorry. Yes, it should be counted.

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