Linear indexing
in [Matlab]
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From: Ben Williams on 1 Jun 2010 13:47 Hi there, I have an array of data within which I would like to be able to find the linear index of elements that satify a given condition. For example: data = [1,2,3,4,5,6,7,8,9,10]; find linear index of elements where data > 3 and data <6 . Pass linear index of these elements to a new arrray. I am sure it must be simple, but does anybody know how to do this? Thanks, Ben
From: Steven Lord on 1 Jun 2010 14:29 "Ben Williams" <benjamin.williams(a)remove.this.plymouth.ac.uk> wrote in message news:hu3h2u$9uc$1(a)fred.mathworks.com... > Hi there, > > I have an array of data within which I would like to be able to find the > linear index of elements that satify a given condition. > For example: > > data = [1,2,3,4,5,6,7,8,9,10]; > > find linear index of elements where data > 3 and data <6 . Pass linear > index of these elements to a new arrray. > I am sure it must be simple, but does anybody know how to do this? Are you certain you need the linear indices? If you're going to use them to index back into data (or into another variable of the same size and shape as data) then don't use linear indexing -- use logical indexing. data = 1:10; logicalIndices = (data > 3) & (data < 6); valuesInRange4to5 = data(logicalIndices); If you must obtain linear indices: linearIndices = find(logicalIndices); -- Steve Lord slord(a)mathworks.com comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ To contact Technical Support use the Contact Us link on http://www.mathworks.com
From: us on 1 Jun 2010 15:12 "Ben Williams" <benjamin.williams(a)remove.this.plymouth.ac.uk> wrote in message <hu3h2u$9uc$1(a)fred.mathworks.com>... > Hi there, > > I have an array of data within which I would like to be able to find the linear index of elements that satify a given condition. > > For example: > > data = [1,2,3,4,5,6,7,8,9,10]; > > find linear index of elements where data > 3 and data <6 . Pass linear index of these elements to a new arrray. > > I am sure it must be simple, but does anybody know how to do this? > > Thanks, > > Ben one of the solutions v=[1,2,3,4,5,6,7,8,9,10,4,4,10,4,5]; lix=find(v>3 & v<6) % lix = 4 5 11 12 14 15 us
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