Playing with matrix and putting in number values
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Nicle Davidson
am 23 Sep. 2021
Bearbeitet: Nicle Davidson
am 24 Sep. 2021
I would like to have a matrix such as X
I have a word ABCD
this word has a sign number 12
The matrix X is made as
X=zeros(5,5)
I have desided that it will be like:
start A B C D
start 0 0 0 0 0
A 0 0 0 0 0
B 0 0 0 0 0
C 0 0 0 0 0
D 0 0 0 0 0
I will go from start to A and put the number 12 in X(start,A) position
then I go from A to B and put the number 12 in X(A,B) position
and so on
the rows are from and columns are to
How can I put the number in those positions, and how can I tell the matrix that for example position X(3,3) should be used and put number in if, in the given word you came to something like BB, or as in this example we have ABCD, how can I tell the matrix that when you come to CD then put a value of 12 in X(4,5)?
The matrix X here needs to understand that if I start a word with A so it put a number 12 in position X(1,2) then I come to AB, so I come from A to B, so the value 12 should be put in X(2,3) and so on until ABCD word is done (which means do this once for BC and once for CD, and save the the matrix X with the new valuses of 12 it god in those positions.
A bit difficult to explain, but I hope it makes sence
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Benjamin Kraus
am 23 Sep. 2021
There seems to be a few things missing from your description, such as where the number 12 comes from, and how you want to handle the situation where a sequence of letters is repeated (if the string was ABABABA for example). But, this code will do what you indicated, and you will have to work out the remaining details.
word = 'ABCD';
magicNumber = 12;
% Start by assigning a unique index to each unique letter.
[uniqueLetters,~,ind] = unique(word);
X = zeros(numel(uniqueLetters)+1);
% Increment the unique indices to account for the "start" index.
ind = ind(:)'+1;
% Append "1" to the beginning to indicate "start".
ind = [1 ind];
% Loop through the vector of indices, recording the pairings.
for p = 1:numel(word)
% Note this just overwrites the previous value if a pairing of letters
% is repeated.
X(ind(p),ind(p+1)) = magicNumber;
end
disp(X)
% For fun, put this into a table, so you have nice row and column headers.
labels = ["Start"; string(uniqueLetters')];
tbl = array2table(X,"RowNames", labels, "VariableNames", labels);
disp(tbl)
5 Kommentare
Benjamin Kraus
am 23 Sep. 2021
@Nicle Davidson Your new question is quite a bit more complicated than your existing question. I suggest you post a new question to MATLAB Answer (you can refer back to this question) with the code you've written so far.
Some tips: If you had mentioned you were interested in the ASCII values, that actually makes things a touch easier. MATLAB character vectors store the ASCII code internally, and you can perform math on those values. To convert the ASCII codes 33 (!) through 126 (~) into the numbers 2 through 94 you can just "subtract" ! from your vector:
word = 'Hello, World!';
double(word) % See the numeric representation (ASCII) for each character.
word-'!'
There are a few options for storing your list of word -> number pairings. My suggestion is just two vectors: One with your words, another with the corresponding numbers. For example:
words = ["matthew", "jonathan", "david"];
numbers = [12 10 5];
I hope that helps you get a little farther along.
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