# [MATLAB], 41 bytes <!-- language-all: lang-matlab --> function x=g(f,x);while f(x)-x;x=f(x);end [Try it online!][TIO-jay9sznn] [MATLAB]: https://matlab.mathworks.com/ [TIO-jay9sznn]: https://tio.run/##y08uSSxL/f8/rTQvuSQzP0@hwjZdI02nQtO6PCMzJ1UhTaNCU7fCusIWxLBOzUv5D8TWKZnFBRrpGg5AMSPdCh1DTU3r/wA "Octave – Try It Online"