converting double to string

I am making a vigenere cipher function with a varying alphabet, with inputs (message,key,alphabet)

e.g ('AVECAESAR','ROME','A':'Z')

I presume I have to convert alphabet to string, and then work the cipher out from there, but I don't know how to do this. I can't seem to get anything but 0 from alphabet.

Answer 1

[Thomas]

function vigenere(message,key,alphabet)

message
key
alphabet

y=double(alphabet)
end

Where are you getting stuck?

>> vigenere('AVECAESAR','ROME','A':'Z')
message =
AVECAESAR
key =
ROME
alphabet =
ABCDEFGHIJKLMNOPQRSTUVWXYZ
y =
  Columns 1 through 5
         65.00         66.00         67.00         68.00         69.00
  Columns 6 through 10
         70.00         71.00         72.00         73.00         74.00
  Columns 11 through 15
         75.00         76.00         77.00         78.00         79.00
  Columns 16 through 20
         80.00         81.00         82.00         83.00         84.00
  Columns 21 through 25
         85.00         86.00         87.00         88.00         89.00
  Column 26
         90.00

Answer 2

[C.J. Harris]

To convert string to double:

x = 'AVECAESAR';
y = double(x);

To convert double to string:

x = [65 86 69 67 65 69 83 65 82];
y = char(x);

[Sam Burgin]

char('A':'Z') just gives a little box though, what I want is something like a (65:90) matrix

[Jonathan Sullivan]

It doesn't give me a "little box." It gives me ABCDEFGHIJKLMNOPQRSTUVWXYZ.

[C.J. Harris]

Try this, I can assure you it will not give you any kind of Euclidean shape:

double(char('A':'Z'))

Answer 3

[Sam Burgin]

this was all down to me using freemat and not matlab itself!