Getting data values from a plot

1 次查看（过去 30 天）
NS
NS 2011-7-8
Hi Guys,
I want to get (x,y) values from a plot. Say my plot is made of the following points (1,1) (2,3) (4,4) and (5,9). Is there anyway to get the value of y on this plot when x=2.5.
Thanks NS

请先登录，再回答此问题。

采纳的回答

Nathan Greco
Nathan Greco 2011-7-8
User interpolation
x = [1 2 4 5];
y = [1 3 4 9];
xi = x(1):.01:x(end); %values between x
yi = interp1(x,y,xi);
findyatx = 2.5;
yfound = yi(abs(xi-findyatx)<eps);
  3 个评论
显示 1更早的评论
Sean de Wolski
Sean de Wolski 2011-7-8
Distinct means no duplicates. Take the mean of any duplicate values. (unique and accumarray will be your friends)
NS
NS 2011-7-8
Works really well. Thanks Nathan

请先登录，再进行评论。

更多回答（1 个）

Sean de Wolski
Sean de Wolski 2011-7-8
You mean fit a line to it and solve?
Sure, use polyfit and polyval.
doc polyfit
doc polyval
  3 个评论
显示 1更早的评论
Sean de Wolski
Sean de Wolski 2011-7-8
"Best" is a word you could write a PhD thesis on.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Interpolation 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