how to creat this vector?

Question

benghenia aek 2019-1-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/442286-how-to-creat-this-vector

编辑： Stephen23 2019-1-30

采纳的回答： Rik

在 MATLAB Online 中打开

hello everyone;

i have vector

X=[1 1 0 1 1 1 0 0 0 1 1 1 1 1 0 0 1 0 0 0 1 1 1 1 0]
c= size number of 1 from the vector X
c=[2 3 5 1 4]
h=mean(c)
h=3;
if c>h
       c=c; 
elseif c<=h
       c=0;
end
Y=[0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 0]

how to creat vector Y?

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Answer 1

Rik 2019-1-30

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https://ww2.mathworks.cn/matlabcentral/answers/442286-how-to-creat-this-vector#answer_358708

在 MATLAB Online 中打开

I'm going to guess you mean this instead, and wanted to create Y from X accordingly.

X=[1 1 0 1 1 1 0 0 0 1 1 1 1 1 0 0 1 0 0 0 1 1 1 1 0];
c=[2 3 5 1 4];
h=mean(c);
for k=1:numel(c)
    if c(k)>h
        c(k)=c(k);
    elseif c(k)<=h
        c(k)=0;
    end
end

This can be solved with the code below.

X=[1 1 0 1 1 1 0 0 0 1 1 1 1 1 0 0 1 0 0 0 1 1 1 1 0];
encoded=bwlabel(X);
c=histc(encoded,1:max(encoded));
ind=find(c<=mean(c));
Y=X;
Y(ismember(encoded,ind))=0;
Y_check=[0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 0];
isequal(Y,Y_check)
%isequal might return false for floats, if so, check if this is small:
%max(abs(Y-Y_check))

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Answer 2

Stephen23 2019-1-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/442286-how-to-creat-this-vector#answer_358707

编辑：Stephen23 2019-1-30

Exactly like in my answer to your earlier question:

https://www.mathworks.com/matlabcentral/answers/442047-how-to-creat-this-vector

X=[1 1 0 1 1 1 0 0 0 1 1 1 1 1 0 0 1 0 0 0 1 1 1 1 0]
Y = X;
D = diff([0,X,0]);
B = find(D>0);
E = find(D<0)-1;
N = 3;
for k = 1:numel(B)
    if (E(k)-B(k))<N
        Y(B(k):E(k)) = 0;
    end
end
Y

Giving:

X =
   1  1  0  1  1  1  0  0  0  1  1  1  1  1  0  0  1  0  0  0  1  1  1  1  0
Y =
   0  0  0  0  0  0  0  0  0  1  1  1  1  1  0  0  0  0  0  0  1  1  1  1  0