So this code when ran as a script works

So this code when ran as a script works just fine and gives me numerical answers

syms x y z
eqn1= x + y + z == 3;
eqn2= 2*x + 3*y + 7*z == 8;
eqn3= 5*x + 9*y + 8*z == 5;

S = solve(eqn1, eqn2, eqn3)
M = [S.x, S.y, S.z]

but when i try making a GUI so i can type the equations

syms x y z

eqn1=get(handles.edit1, 'String');
eqn2=get(handles.edit2, 'String');
eqn3=get(handles.edit2, 'String');

S = solve(eqn1, eqn2, eqn3)
M = [S.x, S.y, S.z]

i get this error

Warning: The solutions are parametrized by the
symbols:
z1 = C_

> In solve at 190
  In tresxtres>pushbutton1_Callback at 157
  In gui_mainfcn at 96
  In tresxtres at 42
  In @(hObject,eventdata)tresxtres('pushbutton1_Callback',hObject,eventdata,guidata(hObject)) 

S = 

      x: [1x1 sym]
      y: [1x1 sym]
      z: [1x1 sym]

M =

[ 4*z1 + 1, 2 - 5*z1, z1]

what needs to be done so i can get a numerical answer?

[Walter Roberson]

I don't know if it will fix the problem, but it would be better to use

eqn1 = sym(get(handles.edit1, 'String'));
eqn2 = sym(get(handles.edit2, 'String'));
eqn3 = sym(get(handles.edit2, 'String'));

In the future, solve() will no longer be able to solve() strings, so you will need something like this eventually anyhow. And it gives you an opportunity to display the equations to be sure they are what you think they should be.