Please help! How to express p as the projection of b onto the Col A according to the theory. I know that the component of b orthogonal to ColA is z=b-p(accodfing to the theory )

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Tianlan Yang
Tianlan Yang on 8 Apr 2021
Commented: Tianlan Yang on 9 Apr 2021
function [p,z]=proj(A,b)
format
A=shrink(A);
m=size(A,1);
p=[];
z=[];
boolean = true
if ~isequal(size(A,1),size(b,1))
disp("No solution: dimensions of A and b disagree")
display(p)
display(z)
return;
end
y=[A,b];
if ~isequal(rank(y),size(y,2))
disp('b is in Col A')
p=???
z=b-p
return;
end
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