MATLAB: Finding value index within a range

index

hi i have a matrix

a =

     1     2     3
     4     5     6
     7     8     9

I need to find the index of those whose value is greater than 1 and less than 5

how to do this?

Best Answer

With find function:

       a = [
       1     2     3
       4     5     6
       7     8     9];
   [row, col] = find(a>1 & a<5)

Related Solutions

MATLAB: Finding a row in matrix

Read about ismember

a=[1 2 3;5 8 9 ;5 6 4;1 2 5] ;
b =  [5 6 4] ;
idx = find(ismember(a,b,'rows'))

MATLAB: Finding distance within a range of distance

ij5 = find(I==5);
[i5 j5] = ind2sub(size(I),ij5);
out1 = [nchoosek(ij5,2) bsxfun(@(x,y)sqrt(diff(nchoosek(x,2),[],2).^2....
                                       +diff(nchoosek(y,2),[],2).^2),i5,j5)];
[non,indout]=min(out1(:,3)); 
out = out1(indout,:);

in vector "out" the first Two members - the indices of matrix "I", the third distance between them

EDIT

 out = out1(out1(:,3) <= 3,:)

EDIT EDIT

The answer to the last Mohammad comment:

[ii,jj]=ind2sub(size(I),nchoosek(find(I==5),2));
out1 = [ii jj sqrt(sum(reshape(diff([ii;jj],[],2).^2,[],2),2))];
[non,indout]=min(out1(:,5)); % 1 variant
out = out1(indout,:);
out = out1(out1(:,5) <= 3,:); % 2 variant

Best Answer

Related Solutions

MATLAB: Finding a row in matrix

MATLAB: Finding distance within a range of distance

Related Question