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 个评论
Stephen23
2018-2-5
"These two functions were introduced in R2017b. Is it possible to use these functions with R2017a?"
No.
采纳的回答
Birdman
2018-2-5
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 个评论
Jan
2018-2-5
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] .
更多回答(1 个)
Salam Ismaeel
2018-9-4
编辑:Salam Ismaeel
2018-9-4
% 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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