Converting symbolic boolean to MATLAB boolean

Hi,

I have a symbolic expression that can be evaluated to true / false, and I would like to get that result back to MATLAB.

This is what I have tried:

>> sym('1>0')

ans =

0 < 1

>> simplify(sym('1>0'))

ans =

TRUE

>> double(simplify(sym('1>0')))
??? Error using ==> eval
Undefined function or variable 'TRUE'.

Error in ==> sym.sym>sym.double at 937
            X = eval(Xstr);

>> logical(simplify(sym('1>0')))
??? Error using ==> logical
Conversion to logical from sym is not possible.

>>

Thanks Joan

[Oleg Komarov]

Is the simplify avoidable?

[Joan Puig]

The reason why I use the simplify is so that I end up getting a TRUE/FALSE

Answer 1

[Walter Roberson]

strcmp(char(sym('TRUE')),'TRUE')

[Joan Puig]

This would work, but I was hoping to get a "native" way to do the conversion

[Walter Roberson]

piecewise() or _if() might be easiest. Neither of those appear to have MATLAB interfaces, though, so you might need to use evalin().

[Joan Puig]

Actually, the _if trick will do, and also, it solves another problem I had

Thanks!