```Date: May 6, 2013 9:14 AM
Author: Nasser Abbasi
Subject: Re: how solve this equation with one unknown?

On 5/6/2013 7:59 AM, ghasem wrote:>> =======================================> ok,you right.> my code (with correction) is as following:> my code is :> gr1 = sqrt(-100 - my_var^2);EDU>> gr1 = sqrt(-100 - my_var^2);Undefined function or variable 'my_var'.<SNIP>>> I want to solve "det_A" to obtain "my_var" value.>but I don't know how introduce "my_var" in gr1,gr2 and gr3,such that in "det_A",>exist "my_var" as a variable.> if I use from " syms my_var",therefore I can not use from fsolve.> obviously,in the above,I get this error:> ??? Undefined function or variable 'my_var'.> how introduce "my_var" to matlab?> ghasem>-----------------------syms my_var;.... your code....EDU>> det_A  det_A =- 15000*(- my_var^2 - 70)^(1/2)*(- my_var^2 - 150)^(1/2)*besselk(1, (- my_var^2 - 70)^(1/2))*besseli(0, (- my_var^2 - 100)^(1/2))*besseli(0, (- my_var^2 -....<snip>solve(det_A)------------------------  ans =9.4713545425002677821820583754265*i--Nasser
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