MATLAB-输入字符在MATLAB语句或表达式中无效

Question

I am trying to evaluate a formula given in a text file.

fid = fopen('ReactionFlux.txt')
EqRF = textscan(fid, '%s', 'Delimiter', {'\n'});
fclose(fid);

syms Chyl_gi Chyl_ly_release_rate_k

eval(EqRF{1}{1})

The context of text file ReactionFlux.txt is

ReactionFlux33 = Chyl_gi*Chyl_ly_release_rate_k

Yet everytime that I try to evaluate the line here, it gives the error

Error: The input character is not valid in MATLAB statements or expressions.

Is there a hidden whitespace character that is invalid or something?

Answer 1

Sometimes textscan will pull up invisible glyphs that are in the file. You can get usually get rid of them by wrapping the extracted line in strtrim , which gets rid of all whitespace at the beginning and end of a string:

eval(strtrim(EqRF{1}{1}))