Convert an array of letters into numbers

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Ivan Mich
Ivan Mich 2021-1-30
评论： Walter Roberson 2021-1-31
I would like to convert an array of letters into numbers. Based on this code:
Alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
numbers = [3,6,12,1,1,3]
letters = Alphabet(numbers)
I would like to make the reverse of this. I mean I want to find eg 'HELLO' to which numbers correspont based on the above code.

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回答（2 个）

Walter Roberson
Walter Roberson 2021-1-30
Ran in:
Alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
Alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
[~, HelloNumbers] = ismember('HELLO', Alphabet)
HelloNumbers = 1×5
8 5 12 12 15
Map(Alphabet) = 1:length(Alphabet);
Map('HELLO')
ans = 1×5
8 5 12 12 15
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Stephen23
Stephen23 2021-1-31
"Is there a way to set A equal to Á and À? I mean in order to not take into account accents?"
Yes, two approaches were given to you in answers to your earlier question (which you then deleted):
https://www.mathworks.com/matlabcentral/answers/721344-how-to-compare-letters-if-they-are-same
Walter Roberson
Walter Roberson 2021-1-31
Ran in:
Alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZÀÈÌÒÙÁÉÍÓÚÄËÏÖŸ';
Map(Alphabet(1:26)) = 1:26;
Map(Alphabet(27:end)) = Map('AEIOUAEIOUAEIOY');
Map('HÈLLÖ')
ans = 1×5
8 5 12 12 15

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Ive J
Ive J 2021-1-30
编辑：Ive J 2021-1-30
One way would be Map object:
alph = 'A':'Z';
num = 1:numel(alph); % or whatever
M = containers.Map(string(alph'), num);
term = 'HELLO';
arrayfun(@(x) M(x), string(term')).'
ans =
8 5 12 12 15

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