What is the formula of left devision?
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When I key in
a=[1 2 4];b=[2 4 7]; >> z=a'\b'
then i get this value z =
1.8095
may i know what is the formula to get this value? Thanks.
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Accepted Answer
dpb
on 15 Mar 2014
doc mldivide % and follow links therein
2 Comments
dpb
on 15 Mar 2014
Edited: dpb
on 15 Mar 2014
It's solution to a*z=b which is a least-squares problem formulation w/o an intercept. Matlab has a number of different ways to actually solve the system depending on the analyzed characteristics of a. These are discussed in the previous links. Seems like there's some more discussion in Cleve's Corner from the past. Possibly a search at mathworks.com could uncover a little more in depth but the actual algorithms are proprietary.
Try
a*z
from command line and see what you get.
Or,
regress(b',a')
ans =
1.8095
if you have the Statistics Toolbox for another way to fit the model. Or, you should be able to write the least squares equations and solve analytically for this small a system.
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