How to make an index of the points of a vector that can then be used in a matrix

This is the function I have generated: function [Points, Elements] = make1DGrid(Nel,L) %L (Lenght of domain) %Nel (Number of elements)

Points = linspace(0,L,Nel)

Elements = [Points(1:end-1);Points(2:end)] end

my function produces: Points = [0 0.33 0.66 1] Elements = [0 0.33; 0.33 0.66; 0.66 1]

But instead of creating a matrix (Elements) where the coordinates of the points are used I need to create a matrix where the index of the points are used i.e for Nel=3, and L=1 Points = [0 0.33 0.66 1] Elements = [1 2; 2 3; 3 4]

[Jan]

For Nel=3 you do not get Points = [0 0.33 0.66 1], but this is Nel=4.

Answer 1

[Jan]

If you need the indices instead of the values, simply use the indices instead of the values :-)

function [Points, Elements] = make1DGrid(Nel,L)
Points   = linspace(0, L, Nel);
Elements = [1:Nel-1; 2:Nel].';  % Instead of: [Points(1:end-1); Points(2:end)]
end

[Ale]

Thanks so much. I thought it had to be Nel but every time I used it I kept getting errors because I wasn't using the correct syntax so you've helped a lot!