mink and maxk functions
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I'm using MATLAB R2017a. While trying to use "mink" and "maxk" functions, the MATLAB responds "Undefined function or variable 'maxk'." These two functions were introduced in R2017b. Is it possible to use these functions with R2017a? if yes, then how?
1 commentaire
Stephen23
le 5 Fév 2018
"These two functions were introduced in R2017b. Is it possible to use these functions with R2017a?"
No.
Réponse acceptée
Birdman
le 5 Fév 2018
One approach would be writing your own function:
function y=mink(A,k)
A=sort(unique(A));
y=A(1:k);
end
Call this function from command line as follows
A=1:10;
mink(A,3)
and the first three smallest elements will be displayed.
7 commentaires
Jan
le 5 Fév 2018
mink does not reply unique elements. Therefore the correct replacement is:
function y = mink(A, k)
A = sort(A); % No UNIQUE here
y = A(1:k);
end
See: mink([1,1,2,3], 2) replies [1,1,2] .
Plus de réponses (1)
Salam Ismaeel
le 4 Sep 2018
Modifié(e) : Salam Ismaeel
le 4 Sep 2018
% function [B BIndex RestVector]= maxk2(A, k)
% Find k largest elements in a Vector A
% B : Vector with all max elements (included repeated)
% BIndex : idx of max k element
% RestVector : rest of the elements without max k elements
function [B BIndex RestVector]= maxk2(A, k)
B = 0;
RestVector = A;
sumIndex = 1;
for i=1:k
MaxA = max(A);
I = A == MaxA;
sumI = sum(I); %To find number of Max elements (repeated)
B(sumIndex: sumIndex+sumI-1) = MaxA; % to same max elements in B
BIndex(sumIndex: sumIndex+sumI-1) = find(A == MaxA);
sumIndex = sumIndex + sumI;
A(I) = min(A); % exchange the max elements by a smallest value
end
RestVector(BIndex) = []; % remove largest values
------------------------------ Example ------------------
>> x
x =
4 17 65 73 65 45 55 30 74 19
>> [x1 x1idx x1new ] = maxk2(x,4)
x1 =
74 73 65 65 55
x1idx =
9 4 3 5 7
x1new =
4 17
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