MATLAB: Getting the central n numbers in array..

getting the central n numbers in array..

Is there an easy way to get central n numbers in an array?for eg x=[ 1 2 3 4 5] I want to extract the central 3 numbers (i.e) 2,3 and 4.Which is the shortest way to do that?

Best Answer

To extract the middle N elements of the vector x:

x((end-N)/2+1:(end+N)/2)

Warning: this will cause an error if you ask for an odd number of elements from a vector of even length, or an even number of elements from a vector of odd length.

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MATLAB: How to store this data in array..

In MATLAB you can hold differently sized data in a cell array . The data inside can be of any class and of any size, but you need to pay careful attention to the indexing . Here is a simple example that does something like you want to do:

A = {[1,2],[3,4;5,6],[7;8;9]};

The cell array A contains three numeric arrays of different sizes. You can retrieve any one of these arrays using cell indexing:

>> A{2}
ans = [3,4;5,6]

Also note that there are many other useful functions for cell arrays , such as cellfun:

>> cellfun(@numel,A)
ans = [2,4,3]

MATLAB: Picking the (n) th occurrence of a number in a vector or the (n)th row in a matrix.

% make a random vector of data just for example purposes
x = rand(25,1);
% define n for your nth element selection
n = 3 % for example every 3element
% make a vector with the nth elements
iSelect = 1:n:length(x);
% select every nth element
xSelect = x(iSelect)

You could also combine some of these lines of code to make it more compact

xSelect = x(1:3:length(x))

Best Answer

Related Solutions

MATLAB: How to store this data in array..

MATLAB: Picking the (n) th occurrence of a number in a vector or the (n)th row in a matrix.

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