MATLAB: Dataset expansion keeping same values

database

Is it possible to extend a data in the same fashion as c=1 2 3 4 5 to c1 = 1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 4 4 4 4 4 5 5 5 5 5 but on a much larger scale from an array of 144 to an array of 1440

Best Answer

To transform myArray by repeating its elements nRepeat times:

myArray = 100*rand(1,144); % fake data
nRepeat = 10;
myArrayRepeat = reshape(ones(nRepeat,1)*myArray,1,nRepeat*length(myArray));

or since Matlab R2015a:

myArrayRepeat = repelem(myArray,nRepeat);

Related Solutions

MATLAB: I want to traverse an array in an ‘inverse s’ order and store in a single row array is there any matlab function or code for this?eg[1 2 3; 3 4 5; 4 5 1] becomes [1,2,3,5,4,3,4,5,1]

>> A = [1,2,3;3,4,5;4,5,1];
>> A(2:2:end,:) = A(2:2:end,end:-1:1);
>> reshape(A',1,[])
ans =
   1   2   3   5   4   3   4   5   1

MATLAB: Cell array expansion

This is the standard behaviour of Matlab:

x = {1, 2};
y = x{:};   % y is x{1}

You see the same method for:

a = rand(1, 10);
b = max(a);

Why is this equivalent? Because MAX replies 2 outputs as "x{:}" and if just the 1st is caught, the 2nd is ignored. Therefore these methods are equivalent also:

x = {1, 2};
[y1, y2] = x{:}
a = rand(1, 10);
[b1, b2] = max(a)

So I would not expect an MLint-warning for a standard behaviour.

Best Answer

Related Solutions

MATLAB: I want to traverse an array in an ‘inverse s’ order and store in a single row array is there any matlab function or code for this?eg[1 2 3; 3 4 5; 4 5 1] becomes [1,2,3,5,4,3,4,5,1]

MATLAB: Cell array expansion

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