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')
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Accepted Answer
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 ?
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More Answers (1)
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'.
[V,M]=max(cell2mat(SUB));
where
V =
191.0598
M =
4
5 Comments
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.
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