在matlab中选择数组的特定元素

Question

如何选择N个元素然后忽略接下来的N个元素，然后选择接下来的N个，依此类推？

阵列的例子a = 1：100;

b = 1,2,3,7,8,9,13,14,15，......

Answer 1

方法＃1

a1 = reshape([a zeros(1,2*N - rem(numel(a),2*N))],N,[]);
out = reshape(a1(:,1:2:end),1,[]);
if rem(numel(a),2*N)<N
    out = out(1:N*floor(numel(a)/(2*N)) + rem(numel(a),2*N)); %//output
end

方法＃2

a1 = vec2mat(a,N)'; %//'
out = reshape(a1(:,1:2:end,:),1,[]);
if rem(numel(a),2*N)<N
    out = out(1:N*floor(numel(a)/(2*N)) + rem(numel(a),2*N)); %//output
end

方法＃3

mat1 = [true false];
mat2 = reshape(mat1(ones(N,1),:),[],1);
mat3 = reshape(mat2(:,ones(1,ceil(numel(a)/(2*N)))),[],1);
out = a(mat3(1:numel(a)));  %//output