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using 3x1 matrix to make 21x1 matrix

Asked by Maria Galle on 11 Nov 2019 at 4:03
Latest activity Commented on by Shubham Gupta on 11 Nov 2019 at 4:16
I have built the 3x1 matrix below
EA = 1;
h = 1;
P = 1
FF = @(xi) (0.5*xi).*(xi-1)
f(1,1) = P*h/2*quad(FF,-1,1)
FF = @(xi) (1-xi.^2)
f(2,1)= P*h/2*quad(FF,-1,1)
FF = @(xi) (0.5*xi).*(xi+1)
f(3,1) = P*h/2*quad(FF,-1,1)
I want to use the 3x1 matrix to create a 21x1 matrix following the pattern below
new doc 2019-11-10 22.57.58_1.jpg
the overlapped elements should be added. I want to use a for loop to create the matrix unless there's another method

  2 Comments

Walter Roberson
on 11 Nov 2019 at 4:08
Is it correct that after the first entry, it just keeps repeating [f12; f13+f11] over and over?
Shubham Gupta on 11 Nov 2019 at 4:16
Do you want something like this?
f_out = [f(1);repmat([f(2);f(2)+f(3)],[10,1])]

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