difference between x and 'x'

x= 0:5:20;

if x defined as above.what is the difference between x*2 and 'x'*2 ?

I got :

0 10 20 30 40 for x*2

and

240 for 'x' *2

Answer 1

[Guillaume]

What a strange question!

x is the variable you previously defined, so x*2 multiply the content of the variable by 2.

'x' is a char vector that happens to contain the same letter that you used to name a variable but that's totally irrelevant. 'x'*2 multiply the character codes of the char vector by 2. The character code of the 'x' character is 120, so you get 240.

See for example:

>> 'hello'*2
ans =
   208   202   216   216   222

because the character codes of 'h' is 104, 'e' is 101, 'l' is 108 and 'o' is 111.

Answer 2

[Mahmoud Elgarhy]

Guillaume, Thank you very much