How can I re-arrange a matrix?

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gsourop
gsourop 2020-5-8
评论： gsourop 2020-5-8
Hi everyone,
Let's assume that I have a matrix X, dimensions 10x2, a variable z of dimensions 10x1. Then I want to create an interaction term based on the sorted values of y, so that the first half gets 0 and the highest values get 1. Then I want to regress the interaction term on variable y.
x = randn(10,2);
z = randn(10,1);
y = randn(10,1);
[zsorted,zsindex]=sort(z);
zsorted(1:5)=0; zsorted(6:end)=1;
% Interaction Term
intterm = x(zsindex,:).*zsorted;
How can i transform the elements of the interaction term back to the original order of x? I could get the same results by
res = ols(y(zsindex,:), intterm);
But is there any other way to be done?
Thanks in advance.

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采纳的回答

Walter Roberson
Walter Roberson 2020-5-8
编辑：Walter Roberson 2020-5-8
z = randn(10,1);
[~,zsindex]=sort(z);
intterm = z;
intterm(zsindex(1:end/2)) = 0;

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