variable undefined error while using anonymous function with user input

Well. i want to write a program that accepts an equation in variables x & y. then using anonymous function, i tried to solve the given equation. But it says x and y undefined. my code is:

     h=input('enter an equation in x and y: ');
     myfunction = @(x,y) h;
     x = 1;
     y = 10;
     z = myfunction(x,y);
     disp(z);

Is there any way to input the equation and solve using anonymous function. Also i don't want to use 'inline' function since it'll be removed in future releases.

I've also tried syms x; But in that case it doesn't substitute 'x' with '1'. had to use subs() command. and subs() does't replace 2 variables i.e. it is for one variable replacement only.

Answer 1

[Star Strider]

You need to have the input as a string (I prefer the inputdlg function for this) and then use the str2func function to create the function handle.

This works:

hc = inputdlg('enter an equation in x and y: ');
myfunction = str2func(['@(x,y)' hc{:}]);
x = 1;
y = 10;
z = myfunction(x,y);
disp(z);