MATLAB: Character vectors and strings in the first argument can only specify a variable or number. To evaluate character vectors and strings representing symbolic expressions, use ‘str2sym’.

syms

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syms x n
f2 = x^n ; 
symsum(f2/factorial(n),n,0,inf)

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MATLAB: Undefined function ‘matlabFunction’ for input arguments of type ‘double’.

'x^(3)+2x^(2)+x+2'

is a character vector. diff() applied to a character vector gives numeric values:

ans =
   -26   -54    11   -10     2     7    70   -26   -54    10    -9     2    77   -77     7

There is no matlabFunction() for numeric values.

You need to construct a symbolic expression out of the character vector that is passed in.

In older MATLAB releases, you could use sym() to convert character vectors into symbolic expressions. In newer MATLAB releases, you need to use str2sym()

MATLAB: Strings

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clear; clc;
   word = lower(input('Enter a word : ','s'));
   letter = input('Guess a character : ','s');
   stat = findstr(word,letter);
   if ~isempty(stat)
       for x = 1 : length(stat)
           fprintf('Character %c macthes with word %s in column %d\n',letter,word,stat(x));
       end
   else
       fprintf('Character %c no found in word %s\n',letter,word);
   end

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MATLAB: Undefined function ‘matlabFunction’ for input arguments of type ‘double’.

MATLAB: Strings

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