Extracting Data Points From Ezplot

6 次查看（过去 30 天）
Jack Smith
Jack Smith 2015-11-10
评论： Star Strider 2015-11-10
I am plotting the following implicit function using the following code:
ezplot('(y^2)/2 + (((x^2)*y)^(1-1.2))/(1.2-1) - 2/x - 1/(1.2-1) +3/2',[0 6 0 4])
Which produces the following double-valued graphical solution:
However, I am only interested in the line that begins ~0 and increases with x. What I want to do is extract the x and corresponding y values for this line, and, despite a number of attempts, have failed in doing so thus far. Any help would be greatly appreciated.
  1 个评论
Star Strider
Star Strider 2015-11-10
Rather than explot, use ezsurf to see what the routine actually calculates. Then choose the appropriate row and column of ‘XData’, ‘YData’ and ‘ZData’. (This is in R2015b. I haven’t tried it in R2014a or earlier.)

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2015-11-10
The following might have changed as of R2014b.
In R2014a or earlier (and maybe later),
ezh = ezplot('(y^2)/2 + (((x^2)*y)^(1-1.2))/(1.2-1) - 2/x - 1/(1.2-1) +3/2',[0 6 0 4]);
ezch = get(ezh,'Children');
xd1 = get(ezch(1),'XData');
xd2 = get(ezch(2),'XData');
yd1 = get(ezch(1),'YData');
yd2 = get(ezch(2),'YData');
first_part_mask = xd2 <= 1.0;
first_x = xd2(first_part_mask);
first_y = yd2(first_part_mask);
second_part_mask = xd1 > 1.0;
second_x = xd1(second_part_mask);
second_y = yd1(second_part_mask);
both_x = [first_x(:); second_x(:)];
both_y = [first_y(:); second_y(:)];
Now the line you want is both_x together with both_y

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Line Plots 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by