How to use the solve function?!!

Hi Everyone, this is my second question since the first one i stated it with a mistake.

I am trying to solve this equation for Mx :

nux= ((gam+1)/(gam-1))^(1/2) * atan(((gam-1)/(gam+1))*(Mx^2-1))^(1/2)-atan(Mx^2-1)^(1/2);

The values of nux and gam are given.

I tried solve this equation using the solve function (according to http://www.mathworks.com/help/symbolic/solve.html this link) but it didn't work, this is how i wrote it:

Mx=solve(nux-((gam+1)/(gam-1))^(1/2) * atan(((gam-1)/(gam+1))*(Mx^2-1))^(1/2)-atan(Mx^2-1)^(1/2)==0, Mx, 'Real');

The error that i kept getting was:

"Cannot find an exact (case-sensitive) match for 'Mx'

The closest match is: mx in C:\Program Files\MATLAB\R2012a\toolbox\robust\rctobsolete\mutools\commands\mx.m"

Please help me fix this problem, because i need the solution for that equation asap.

Thank you.

Answer 1

[Walter Roberson]

syms Mx
output_MX = solve(nux-((gam+1)./(gam-1)).^(1/2) * atan(((gam-1)./(gam+1)).*(Mx.^2-1)).^(1/2)-atan(Mx.^2-1).^(1/2)==0, Mx, 'Real');

[Alex Mannings]

Thank you Walter, your change did get the code to move little bit but i got this error now:

Error using solve>processOnOff (line 294)

'Real' requires a value.

Error in solve>getEqns (line 257) [k, options] = processOnOff(k, options, v, vc, nargin, varargin);

Error in solve (line 150)

[eqns,vars,options] = getEqns(varargin{:});

Error in DDcode (line 36)

output_MX = solve(nux-((gam+1)./(gam-1)).^(1/2) * atan(((gam-1)./(gam+1)).*(Mx.^2-1)).^(1/2)-atan(Mx.^2-1).^(1/2)==0, Mx, 'Real');