```Date: Apr 4, 2013 9:20 PM
Author: Nasser Abbasi
Subject: Re: How can I change a variable in a equation when use "solve"?

On 4/4/2013 5:17 PM, Jingzhou Wang wrote:> Dear all,>> A question about using the solve function. My code is as follows,>> syms  a x y> s = solve('x*exp(x)=y, y=a-x','x,y')> s = [s.x s.y]>> It works when I use a number such as "2" instead of "a" in the equation>'y=a-x'. But when I include the variable in the equation, it doesn't go.>Since I want to change the "a" value outside the "solve" function, how can I do this?>> The matlab version is R2010a.>> Many thanks!>> Jing>There is no algebraic solution for x--------------------EDU>> syms x y aEDU>> sol=solve(x*exp(x)==a-x,x)Warning: Explicit solution could not be found.> In solve at 179--------------------when you put a number for 'a', then matlab must have usednumerical root finding to solve itEDU>> sol=solve(x*exp(x)==2-x,x)0.6748316143423993509028640916966I hope you know that not every equation have closed form solution.--Nasser
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