# 1 how to extract cols and rows from a matrix，2，how to find a value the vector close to ,

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Roger on 14 Sep 2014
Answered: Image Analyst on 15 Sep 2014
data size is MxN ,assume only one nan in data i need remaining part of data ,
if true
[nanrows,nancols]=find(isnan(data));
remain1 = data;
remain1(:,nancols)=[];
remain1(nanrows,:)=[];
%
remain2= data(nanrows,:);
remain2(1,nancols)=[];
remain3=data(:,nancols);
remain3(nanrows,1)=[];
end
any ways better?
q2: similarly finding a centre of the vector； a=[1 2 2 3 4 2.1 2.2 5] the value may be 2.2 , as the elements close to 2.2 is the most

Salaheddin Hosseinzadeh on 14 Sep 2014
Hi Roger,
I don't think if you needed to assign the data to remain1 remain2 and ... you could do anything you wanted to do with data.
q2- You may wanna use histogram (hist) to determine the most frequent number in your data, which will be 2 probably or you may take an average of that specific bean which gives you more accurate measure. Read more about hist
doc hist
Or you may take an average if that satisfies you.
mean(a)
Good Luck!
Roger on 15 Sep 2014
whatever ,thanks

Image Analyst on 15 Sep 2014
for the first question
m=randi(9, 5,5) % Create sample data
m(4,2:4) = nan % Stick in some nans
% Find non-nan elements.
nonNanData = m(~isnan(m))
For the second question, the "center" as you call it is just the mean, like SH said. If not, explain what you mean.