convert a 10x2 matrix into x,y coordinates

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Supriya Gain
Supriya Gain 2019-8-7
评论： Stephen23 2022-12-14
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?
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KALYAN ACHARJYA
KALYAN ACHARJYA 2019-8-7
@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 2019-8-7
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 2019-8-7
>> 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 个评论
Sirvan Ahmadi
Sirvan Ahmadi 2022-12-14
What if we only want to have,
(1,2)
(3,4)
(5,6)
Stephen23
Stephen23 2022-12-14
Ran in:
"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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Steven Lord
Steven Lord 2019-8-7
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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