```Date: May 27, 2013 11:29 AM
Author: Matt J
Subject: Re: I have 51 linear equations, consisting of 51 unknowns. How to solve it in Matlab by using matrix?

"J K" wrote in message <knvthf\$87h\$1@newscl01ah.mathworks.com>...> > What do you mean by "separate the equations"?> > Let say I have 3 equations with 3 unknowns.> 1x1 + 2x2 + 3x3 = 100> 4x1+ 5x2 + 6x3 = 200> 7x1 + 8x2 + 9x3 = 300> > Normally in Matlab, you will do this command in order to solve x1,x2,x3> > p=[1 2 3; 4 5 7; 7 8 9]'> q=[100 200 300]'> x=inv(p)*qNo. Once again you would normally NOT use inv(). The more efficient way is to use backslash  x=p\qCompare the following>>A=rand(3000);>> tic; inv(A)*A(:,1); tocElapsed time is 1.956851 seconds.>> tic; A\A(:,1); tocElapsed time is 0.623370 seconds.>> > But let's say I don't want to use the method/way that I write. What other options that I have in order to solve for the 51 unknowns?================You could also do x=linsolve(p,q);If your equations have special structure, LINSOLVE can take advantage of this. See doc linsolve.
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