I need to create a function that projects vector b onto vector a

2017 8 5
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I need to create a function that projects vector b onto vector a. I know that all elements of b is 1, and that it has the same dimensions as a. My function needs to work for all dimensions. How do i do this??? Especially the part of defining b
So far i have written this
function projection = computeProjection(a)
projection = (dot(a,b)/norm(a))*a;

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John D'Errico
John D'Errico 2017-8-5
编辑：John D'Errico 2017-8-5

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All you are missing is that b is a vector of ones, of the same size as a?
b = ones(size(a));
At least, that is all you think you need. In fact, you need to modify the formula slightly, to be:
projection = (dot(a,b)/norm(a)^2)*a;
You needed another factor of norm(a) in there to make it work.

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