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view find_elements.m @ 1289:2fd2e2337b77 feature/boundary_optimized_grids

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Add utility function for constructing a (possibly multidimensional) grid based on the grid points used by the boundary optimized SBP operators
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Wed, 01 Jul 2020 15:15:30 +0200
parents 48b6fb693025
children
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% I = find_elements(a,b)
% Finds the index of elements a in b.
% a and b have to be in the same order.
function I = find_elements(a,b)
    I = [];

    j = 1;
    for i = 1:length(a)
        while b(j) ~= a(i)
            j = j + 1;
        end
        I(end+1) = j;
        j = j+1;
    end

    assert(length(I) == length(a),'Expected %d but got %d elements',length(a),length(I))
end