MATLAB: How to convert a cell array to complex double

cell arrayscomplex doubleconvert

Hi everyone, I am new using matlab, I did some calculation using sym in order to get a complex matrix, but I need to conver this matrix to a complex double matrix, how can I do that? 
gg =
  25×1 cell array
    {'z(2)*2i - z(6)*2i'                        }
    {'z(1)*2i + z(3)*2i - z(7)*2i'              }
    {'z(2)*2i + z(4)*2i - z(8)*2i'              }
    {'z(3)*2i + z(5)*2i - z(9)*2i'              }
    {'z(4)*2i - z(10)*2i'                       }
    {'z(7)*2i - z(1)*2i - z(11)*2i'             }
    {'z(6)*2i - z(2)*2i + z(8)*2i - z(12)*2i'   }
    {'z(7)*2i - z(3)*2i + z(9)*2i - z(13)*2i'   }
    {'z(8)*2i - z(4)*2i + z(10)*2i - z(14)*2i'  }
    {'z(9)*2i - z(5)*2i - z(15)*2i'             }
    {'z(12)*2i - z(6)*2i - z(16)*2i'            }
    {'z(11)*2i - z(7)*2i + z(13)*2i - z(17)*2i' }
    {'z(12)*2i - z(8)*2i + z(14)*2i - z(18)*2i' }
    {'z(13)*2i - z(9)*2i + z(15)*2i - z(19)*2i' }
    {'z(14)*2i - z(10)*2i - z(20)*2i'           }
    {'z(17)*2i - z(11)*2i - z(21)*2i'           }
    {'z(16)*2i - z(12)*2i + z(18)*2i - z(22)*2i'}
    {'z(17)*2i - z(13)*2i + z(19)*2i - z(23)*2i'}
    {'z(18)*2i - z(14)*2i + z(20)*2i - z(24)*2i'}
    {'z(19)*2i - z(15)*2i - z(25)*2i'           }
    {'z(22)*2i - z(16)*2i'                      }
    {'z(21)*2i - z(17)*2i + z(23)*2i'           }
    {'z(22)*2i - z(18)*2i + z(24)*2i'           }
    {'z(23)*2i - z(19)*2i + z(25)*2i'           }
    {'z(24)*2i - z(20)*2i'                      }
I have tried:
   New = cell2mat(gg);
But I get the next error:
   Error using cat
Dimensions of matrices being concatenated are not consistent.
Error in cell2mat (line 83)
            m{n} = cat(1,c{:,n});
Also I have tried:
   New = str2double(gg);
But I get:
   Nan
I would really appreciate your help. Thank you in advance.

Best Answer

In modern MATLAB (R2017b or later),
altered_gg = regexprep(gg, '\((\d+)\)', '$1');
as_sym = str2sym(altered_gg);
z_vars = symvar(as_sym);
GG = matlabFunction(as_sym, 'Vars', {z_vars(:)});
then
[T1, Z1] = ode45(GG, time, ini);
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