Hey,
I am using the eval function in combination with the solve
function, as can be seen in the following:
syms x % Setting x as an unknown
Equation = eta_p/(climb_rate_ms+(sqrt(OptimumWS)*sqrt
(2/rho_sea)/((1.345*(x*e)^0.75)/CD_0^0.25)))-OptimumWP;
A_clr_opt = eval(solve(Equation));
(Matlab finds Equation to be equal to:
Equation =
4/5/
(1143/125+1914868778638812090507823564875/36630645762454402
33426508578816*33^(1/4)*40^(3/4)/x^(3/4))-
3969249135925473/36028797018963968 )
However, I get the following error message:
??? Error: This statement is incomplete.
Error in ==> sym.eval at 9
s = evalin('caller',map2mat(char(x)));
Error in ==> RegionalTurboprop at 180
A_clr_opt = eval(solve(Equation))
I use the eval(solve())in a couple of more cases in my
code and only this one gives me an error. What's wrong?
"Alex " <alex.thomos@gmail.com> wrote in message
<fmkjoq$laf$1@fred.mathworks.com>...
> Hey,
> I am using the eval function in combination with the solve
> function, as can be seen in the following:
>
> syms x % Setting x as an unknown
> Equation = eta_p/(climb_rate_ms+(sqrt(OptimumWS)*sqrt
> (2/rho_sea)/((1.345*(x*e)^0.75)/CD_0^0.25)))-OptimumWP;
> A_clr_opt = eval(solve(Equation));
>
> (Matlab finds Equation to be equal to:
> Equation =
> 4/5/
> (1143/125+1914868778638812090507823564875/36630645762454402
> 33426508578816*33^(1/4)*40^(3/4)/x^(3/4))-
> 3969249135925473/36028797018963968 )
>
> However, I get the following error message:
>
> ??? Error: This statement is incomplete.
>
> Error in ==> sym.eval at 9
> s = evalin('caller',map2mat(char(x)));
>
> Error in ==> RegionalTurboprop at 180
> A_clr_opt = eval(solve(Equation))
>
> I use the eval(solve())in a couple of more cases in my
> code and only this one gives me an error. What's wrong?
>
> Thanx in advance,
> Alex
If your Equation has not any analytical solution, the output of
function 'solve' is empty, and the function 'eval' will return
this error.
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