how can i use linspace to generate a row vector with two similar points?

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davood 2013-7-28

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https://ww2.mathworks.cn/matlabcentral/answers/83383-how-can-i-use-linspace-to-generate-a-row-vector-with-two-similar-points

i am creating an initial guess vector. As i have a multipoint BVPs, i should use double entries in the vector for the interface point. i used linspace(2,20,1000). but i want it to have two 16. how can i do it?

thank you

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dpb 2013-7-28

What's a BVP?

Please clarify what you really want...give a small example possibly explaining how you arrived at the result.

davood 2013-7-28

BVP stands for boundary value problem. i am using this page: http://www.mathworks.com/help/matlab/math/boundary-value-problems.html

my question is about the part witch is written:

5.Create an initial guess. For multipoint BVPs, when creating an initial guess using bvpinit, use double entries in xinit for the interface point xc.

thank you

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Answer 1

dpb 2013-7-28

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https://ww2.mathworks.cn/matlabcentral/answers/83383-how-can-i-use-linspace-to-generate-a-row-vector-with-two-similar-points#answer_92945

编辑：dpb 2013-7-28

在 MATLAB Online 中打开

bp=16;  % breakpoint value
sp= 2;  % startpoint
ep=20;  % endpoint
 a0=[linspace(sp,bp,N1) linspace(bp,ep,N2)];

N1, N2 could be Ntot/2 or ratio by the distance between breakpoint and overall range to keep uniform or however is best for the particular problem.

If more breakpoints expand on the above.

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davood 2013-7-28

thank you so much

dpb 2013-7-28

W/ time, you'll dream up a zillion other ways to code the above "plain vanilla" approach.... :)

The point of the earlier question was that there's little hope of providing a really responsive answer (as Azzi's shows) w/o the groundrules laid out clearly.

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