How can I fix the error in the given code? About 'inline'

it_count=0;
xn=0;
if 0 >= 0.9
    disp('0 < 3 is not true.  Stop!')
    root=NaN;
    return
end

a = 0.9; b = 1.2;
f=inline('x^5 – 3*x^4 + 4*x^3 – 4*x^2 + 3*x – 1');
fa = feval(f,a); fb = feval(f,b);

The error statement:

Error using inlineeval (line 14)

Error in inline expression ==> x^5 – 3*x^4 + 4*x^3 – 4*x^2 + 3*x – 1

Error: Invalid text character. Check for unsupported symbol, invisible character, or pasting of non-ASCII characters.

Error in inline/feval (line 33)

INLINE_OUT_ = inlineeval(INLINE_INPUTS_, INLINE_OBJ_.inputExpr, INLINE_OBJ_.expr);

Error in bisect (line 37)

fa = feval(f,a); fb = feval(f,b);

Can anyone help me with the error?

[Stephen23]

Why are you using very outdated and almost obsolete inline ?

https://www.mathworks.com/matlabcentral/answers/7860-inline-vs-anonymous-functions#comment_413404

https://www.mathworks.com/matlabcentral/answers/422189-substitute-out-anonymous-function#answer_339750

Answer 1

[Guillaume]

As pointed out by Stephen, inline is deprecated, due to be removed soon from matlab. You'd be better off using an anonymous function:

f = @(x) x^5 - 3*x^4 + 4*x^3 - 4*x^2 + 3*x - 1

or even better

f = @(x) polyval([1, -3, 4, -4, 3, -1], x);

As for the reason for the error you see, it's because the - sign in your expression are not actual - characters but unicode character en dash (U+2013 or as decimal character code 8211). While they may look the same, they're completely different characters.