The first argument to INPUT must be a character vector.

x = input("Enter the value for x (inside [-1,1]): ");
if x < -1 || x > 1
    disp("Error: the x value is not a valid input")
else
     num_dec = input("Enter the number of decimal values desired for accuracy: ");
     tol = 1 / (10^num_dec); 
end

Not gonna post all of my code yet. first one im getting error pls help and explained why

[Geoff Hayes]

Kathy - which call to input does this error message correspond to? The first, the second, or both? Please copy and paste the full error message to this question. And does your version of MATLAB support double quotes for strings?

[Ameer Hamza]

Which MATLAB Release are you using?

Answer 1

[Ameer Hamza]

You are probably using an older Release of MATLAB, which does not support strings. Try to replace double-quotes with single-quotes.

x = input('Enter the value for x (inside [-1,1]): ');