Difference between mldivide and lsqr
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Hi, I am curious about the difference between mldivide and lsqr.
Both seem to be used for calculating x where A*x=b.
Thank you in advance.
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Accepted Answer
Bruno Luong
on 21 Jul 2023
Edited: Bruno Luong
on 21 Jul 2023
A=rand(3,5)
b=rand(3,1)
The backslash returns a solution with most 0s and lsqr returns solution with minimum l2-norm.
xbackslash=A\b
xlsqr=lsqr(A,b)
xminnorm=lsqminnorm(A,b)
A*xbackslash
A*xlsqr
norm(xbackslash)
norm(xlsqr) % smaller even xlsqr has no O
On the runtime the backslash is usualy faster, at least for dense matrix.
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