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

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

Answer 1

[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!

[Roger]

whatever ,thanks

Answer 2

[Image Analyst]

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.