converting string code into numbers?

Write a function m-file called stringcode that takes a string as input and produces an array containing a code for each letter in the string with A = 0, B = 1, ..., Z = 25 and all other characters getting the value 26

Hints

• Convert the string to all upper case (using the command upper).
• Convert the string to an array of ascii codes (use double).
• Loop through the array and change the codes to the right values. Look up the codes for ’A’ and ’Z’.

here is my code

function    num = stringcode( word )
   asc = double(upper(word))
        if asc >= 33 & asc <=47 & asc < 0
            asc = 26
        else asc = double(upper(word))
        end      
 % simple arithmetic
    num = asc - double('A')
end

I cant get the special characters to come up as the number 26

[Walter Roberson]

Your input is a vector. asc is a vector. Your if is testing a vector. When you test a vector in if then it is only true if every value is true (non-zero).

Also there are no values that are both in the range 33 to 47 and less than 0 simultaneously.

[Mohammad Sami]

Why don't you do this

num = double(upper(asc)- 'A') ;
num(num <0 || num > 25) = 26;

[Walter Roberson]

The homework requires that a loop be used.

[Rik]

Also, you need to use a single pipe character for an array, so that second line doesn't work.