incresing the precision of epsilon to 30 digits by symbolic toolbox, i could encounter not enough input arguments error?

function unidec=quad(a,b,r,eps)
a=input('enter a');
b=input('enter b');
r=sym(eps);
digits(30);
vpa(r);

if abs(a-b)< r
    unidec=' a & b are equal';
else
    unidec='a & b are not equal in double & single precision 3rd loop';

end

[Nicolas Schmit]

https://jp.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

Answer 1

[Walter Roberson]

digits(30) does not increase the precision of the function eps(). The function eps() is a purely numeric function that only operates on single and double.

Your code is inputting a and b as numeric (double precision) . Changing digits() does not affect the result of a double minus a double.

For your code to make any sense, you would need to use

if abs(vpa(a) - vpa(b)) < r