MATLAB: Error using Solve with inequality

Question

Hi all,

I am facing a strange problem with using Solve with inequality.

Could you please help?

Thanks

Answer 1

You did not follow the example carefully.

syms x
>> S = solve(x^2 - 4*x + 3 < 0,'returnconditions',true)
S = 
  struct with fields:
             x: [2×1 sym]
    parameters: [1×2 sym]
    conditions: [2×1 sym]
>> S.conditions
ans =
 1 < x & x < 3
 in(y, 'real')

Note the use of returnconditions. Without that, it gives a solution, but not the interval that you desire. So if I drop that property, we get a solution. It is valid, as you say. But just a solution.

S = solve(x^2 - 4*x + 3 < 0)
S =
 exp(1)
      2