# How to specify a variable (using linspace) like this?

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Shashank on 8 Oct 2012
Distance between first and second point and the distance between second last and last point is 0.5h. All other distances between the neighboring points is h. How to create a grid of say N points that do not include the first and the last point in the grid?

Andrei Bobrov on 8 Oct 2012
Edited: Andrei Bobrov on 8 Oct 2012
afirst = 2;
h = .5;
N = 5;
out = afirst + cumsum([0, .5*h,ones(1,N-1)*h,.5*h])
or
out = [afirst,linspace(afirst + .5*h,afirst + .5*h + (N-1)*h,N),afirst + N*h];
or
a = [2 6];
N = 5;
L = linspace(a(1),a(2),N+1)
L(2:end) = L(2:end)-diff(a)/N*.5
out = [L,a(end)];
##### 2 CommentsShowHide 1 older comment
Shashank on 8 Oct 2012
Thanks Andrei. You seem to have given me a lot of options. I think the second one looks more cogent.

Taha on 8 Oct 2012
Edited: Taha on 8 Oct 2012
N = 5;
h = (last - first)/N;
grid = linspace(first+h/2, last-h/2, N);
##### 2 CommentsShowHide 1 older comment
Taha on 8 Oct 2012
The above piece of code needs 'N', 'last', and 'first' as input parameters. Also, I didn't get what you mean by 'calling a matrix'.