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convert a 10x2 matrix into x,y coordinates

13 vues (au cours des 30 derniers jours)
Supriya Gain
Supriya Gain le 7 Août 2019
Commenté : Stephen23 le 14 Déc 2022
I have a 10X2 matrix. Now i want to convert this into x,y co-ordinate. like (x,y)=[(1,1), (1,2)]. How to do that?
  3 commentaires
KALYAN ACHARJYA
KALYAN ACHARJYA le 7 Août 2019
@Madhan as per my undestanding, may be this one
mat_cor{i,j}=[i,j]; % The loop creates it
A structure with [1,1], [1,2]..... same size as matrix size. I have no clue, WHY?
Supriya Gain
Supriya Gain le 7 Août 2019
Suppse i have a 3X2 matrix [1 2;3 4;5 6]
Now i want the answer as (x1,y1)=(1,2)
(x2,y2)=(3,4)
(x3,y3)=(5,6)

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Stephen23
Stephen23 le 7 Août 2019
>> M = [1,2;3,4;5,6]
M =
1 2
3 4
5 6
>> V = 1:size(M,1);
>> fprintf('(x%d,y%d)=(%d,%d)\n',[V;V;M.'])
(x1,y1)=(1,2)
(x2,y2)=(3,4)
(x3,y3)=(5,6)
  2 commentaires
Sirvan Ahmadi
Sirvan Ahmadi le 14 Déc 2022
What if we only want to have,
(1,2)
(3,4)
(5,6)
Stephen23
Stephen23 le 14 Déc 2022
"What if we only want to have"
M = [1,2;3,4;5,6]
M = 3×2
1 2 3 4 5 6
fprintf('(%d,%d)\n',M.')
(1,2) (3,4) (5,6)

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Plus de réponses (1)

Steven Lord
Steven Lord le 7 Août 2019
If you are trying to create twenty individual variables, one for each element of your 10-by-2 matrix, DON'T DO THAT. See this Answers post for a lengthy discussion of why this is strongly discouraged.
In my opinion, turning that one variable into two (to make it easier to refer to the X and Y coordinates separately) seems reasonable.
A = [1 2;3 4;5 6];
x = A(:, 1);
y = A(:, 2);
With this approach, what you called x2 would instead be x(2). Or you could use the whole vector at once.
plot(x, y) % Shorter than but equivalent to
plot(A(:, 1), A(:, 2))
But the proliferation of variables from one to twenty-one (the twenty new ones plus the original one) is just going to clutter your workspace. Consider: if you had a 10000-by-2 matrix instead of a 10-by-2, do you want to search through twenty thousand variables in your workspace to access the piece of data you need?

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