How to encode alphabets using tables

Hi I want to encode the word "CONGRATULATIONS" using upper case letters.For this I have the table

A 0

B 1

C 2

D 3 ......and so on.

I dont know how to relate this type of mapping in matlab.

Alphabets={'A';'B';'C';'D';'E';'F';'G';'H';'I';'J';'K';'L';'M';'N';'O';'P';'Q';'R';'S';'T';'U';'V';'W';'X';'Y';'Z';'null space'};
numeric_values=[0;1;2 ;3;4;5;6;7;8;9;10;11;12;13;14;15;16;17;18;19;20;21;22;23;24;25;26];
T1=table(Alphabets,numeric_values);
M={'C';'O';'N';'G';'U';'R';'A';'T';'U';'L';'A';'T';'I';'O';'N';'S'};
T2=table(M);

Answer 1

[R.G.]

Hello! Check following code. I used char(65:90) to create A-Z sequence, and Map container to map symbols into codes.

symbols = [num2cell(char(65:90)) 'space'];
codes = 0:26;
dictionary = containers.Map(symbols, codes);
word = num2cell('CONGRATULATIONS');
encoded_word = cell(size(word));
for i = 1:length(word)
    encoded_word{i} = dictionary(word{i});
end
display(cell2mat(encoded_word));

[sadiqa ilyas]

It works .Thanks a lot.

[R.G.]

The same, but using tables

symbols = [num2cell(char(65:90)) "space"]';
codes = (0:26)';
dictionary = table(symbols, codes);
word = num2cell('CONGRATULATIONS');
encoded_word = cell(size(word));
for i = 1:length(word)
    encoded_word{i} = dictionary.codes(dictionary.symbols == word{i});
end
display(cell2mat(encoded_word));

[sadiqa ilyas]

thanks again

[Walter Roberson]

There is an approach using table objects and Rownames that does not require any loops or explicit comparisons.

[sadiqa ilyas]

can u plz give more hints or share links about this topic

[Walter Roberson]

Alphabets={'A';'B';'C';'D';'E';'F';'G';'H';'I';'J';'K';'L';'M';'N';'O';'P';'Q';'R';'S';'T';'U';'V';'W';'X';'Y';'Z';'null space'};
numeric_values=[0;1;2 ;3;4;5;6;7;8;9;10;11;12;13;14;15;16;17;18;19;20;21;22;23;24;25;26];
T1=table(numeric_values, 'rownames', Alphabets);
M={'C';'O';'N';'G';'U';'R';'A';'T';'U';'L';'A';'T';'I';'O';'N';'S'};

T1{M,:}

[sadiqa ilyas]

Thanks. Its really a smart way for mapping.

[Stephen23]

symbols = [num2cell(char(65:90)) 'space'];
codes = 0:26;
dictionary = containers.Map(symbols, codes);
word = num2cell('CONGRATULATIONS');
encoded_word = cell(size(word));
for i = 1:length(word)
    encoded_word{i} = dictionary(word{i});
end
display(cell2mat(encoded_word))

     2    14    13     6    17     0    19    20    11     0    19     8    14    13    18

A = 'A':'Z';
V = 0:25;
T = array2table(V(:),'rownames',num2cell(A(:)));
M = num2cell('CONGURATULATIONS');
T{M,:}

ans = 16×1

2 14 13 6 20 17 0 19 20 11

The MATLAB approach:

'CONGRATULATIONS' - 'A'

ans = 1×15

2 14 13 6 17 0 19 20 11 0 19 8 14 13 18