error in my code

syms x;
f=x^2+x;
M=solve(f);
n=size(M,2);
for i=1:n
if M(i)>1
disp('Ok');
else
disp('Again');
end
end

it show :

>> d
Nhap ham fx^2+x
Error using sym>notimplemented (line 2682)
Function 'gt' is not implemented for MuPAD symbolic
objects.

Error in sym/gt (line 801)
            notimplemented('gt');

Error in d (line 5)
if M(i)>1

Answer 1

[Walter Roberson]

M = double(solve(f));

[justin Taylor]

Thanks ! The problem resolved !

Answer 2

[Sean de Wolski]

That's why input is seldomly recommended, especially when you plan on using the result in something important, like solve.

Recommended steps:

1. Write a function that excepts one input argument
2. Give this function some error checking to make sure that the one input argument meets the criteria for solve
3. Do the rest of the stuff and output a reult.

doc function %will be your friend.