how do i plot certain columns and rows of a matrix

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Praneeth K V
Praneeth K V 2017-4-22
评论： Image Analyst 2017-4-23
i have a matrix of 40*7 and I need to plot columns of only 3rd and 6th. How do I do it?
  1 个评论
Praneeth K V
Praneeth K V 2017-4-22
Sorry, I had put my question wrong. I have to plot a line using x and y coordinates of 2 points which are in different columns, how do I do that

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回答（2 个）

KSSV
KSSV 2017-4-22
A = rand(40,7) ;
figure
hold on
plot(A(:,6),'r')
plot(A(:,7),'b')
legend('6th column', '7th column');
Image Analyst
Image Analyst 2017-4-22
Try this
line([x1, x2], [y1, y2], 'Color', 'b', 'LineWidth', 2);
where the x1 and y1 come from one column, and the x2 and y2 come from the second column. If that doesn't work, then post your data sand indicate which elements of the array you want a line drawn between.
  2 个评论
Praneeth K V
Praneeth K V 2017-4-23
编辑：Praneeth K V 2017-4-23
line([x0(Elem(i,3)),x0(Elem(i,6))], [y0(Elem(i,3)),y0(Elem(i,6))],'Color','b','LineWidth','2'); this is the code i wrote.
ps: Im using loop to create multiple lines and 'i' is the variable parameter
x0 is column matrix and y0 is other column matrix. to create a line im selecting points from x0 and y0 with reference of Elem matrix but this shows error of "Error using line While setting property 'LineWidth' of class 'Line': Value not a numeric scalar"
Image Analyst
Image Analyst 2017-4-23
Did you see where it said the LineWidth was not a scalar and how you were passing it a string? I said to use 'LineWidth', 2 NOT 'LineWidth', '2'. Do not put the 2 in single quotes.

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