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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
Roger 2014-9-14
回答： Image Analyst 2014-9-15
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

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采纳的回答

Salaheddin Hosseinzadeh
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!

更多回答（1 个）

Image Analyst
Image Analyst 2014-9-15
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.

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