converting characters to a number string

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Erik Lee
Erik Lee 2015-10-4
评论： Walter Roberson 2015-10-5
I'm trying to decipher a text file full of lowercase characters. First I have to convert the characters to 27 numbers (1 for each letter and 27=space) using "double". Can you guys help me code:
1. a "function" which converts any text file with 27 unique characters (including space) into a string of 27 unique numbers? I have to use "double" to convert to ASCII first, and then convert the 26 lowercase letters and space into 1:27
ex: function('hello')=[8 5 12 12 15]
2. a "function" that reverses the process, using "char"?
ex: functioninverse([8 5 12 12 15])=hello

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Walter Roberson
Walter Roberson 2015-10-4
[~, idx] = ismember( tolower(TheTextString), ['a' : 'z', ' ']);
result = double(idx);
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Erik Lee
Erik Lee 2015-10-5
The assignment said I have to use "char" to reverse "double"
Walter Roberson
Walter Roberson 2015-10-5
str = 0 + ['a' : 'z', ' '];
RecalledString = char(str(result));

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