Array problem

2011 7 26
3 个回答
回答已采纳
3 次查看（30 天）

0 个投票

Hey every1, I am actually having trouble with arrays!! I have my plot and is underneath and it is not saved in array at the moment but I would like to story it in array so I should have a value for[x1,y1] in an array.. the question is how can I get the values of the plots and store it in an array???
x = linspace(min(Sa),max(Sa),100);
y = pchip(Sa,lambda(Sa),X);
plot(x,y)
a [x,y] then is it by looping through it and if it is how can we say then the next value in x and y.. I want to store each pair value(x,y) of the plot in an array???
Your help will be appreciated!

1 个评论
显示 -1更早的评论 隐藏 -1更早的评论

Susan
Susan 2011-7-26
My plot perfectly works, it is just regarding the array part !

请先登录，再进行评论。

请先登录，再回答此问题。

 采纳的回答

Paulo Silva
Paulo Silva 2011-7-26

1 个投票

SusanArray=[x;y]; %2 rows, first row is x and second is y
%each column is a pair of values

1 个评论
显示 -1更早的评论 隐藏 -1更早的评论

Susan
Susan 2011-7-26
Yeah I know that bit, but how can I actually take the values from x,y and store it there???? i dont know how to access the values created in the plot, i want each point (x1,y1),x2,y2),etc.. how can I get the values from the plot??

请先登录，再进行评论。

更多回答（2 个）

Walter Roberson
Walter Roberson 2011-7-26

1 个投票

h = find(gca,'type','line');
xd = get(h, 'XData');
yd = get(h, 'YData');

7 个评论
显示 5更早的评论 隐藏 5更早的评论

Susan
Susan 2011-7-26
Can you please explain to me the three lines.. Is it meant to be ..
h = find(x,y)
xd = get(h,x)
yd - get(h,y) ????
Oleg Komarov
Oleg Komarov 2011-7-26
findobj(gca,'type','line')
Susan
Susan 2011-7-26
Can you explain to me this?
Susan
Susan 2011-7-26
I did this but it resulted with empty array .. h =findobj(gca,'type',X)
disp(h)
Nathan Greco
Nathan Greco 2011-7-26
After you create your plot, type the lines Walter provided you.
findobj(gca,'type','line') will return the handle of the line object on your current plot. With this handle, you can retrieve the x and y data by using get(h,'XData') and get(h,'YData') respectively...
Susan
Susan 2011-7-26
I typed exactly the three line Walter suggested after the plot and I got an error..
Error using ==> find
Second argument must be a positive scalar integer.
Nathan Greco
Nathan Greco 2011-7-26
And he corrected his "find..." line to be "findobj..." within the comments.

请先登录，再进行评论。

Susan
Susan 2011-7-26

0 个投票

Ok, I've read about this line you guys suggested h = find(gca,'type','line');... But what I am looking for is the actual values of the plot (x1,y1),(x1,y2) etc.. and from what I understood this line is not doing this..
Any Ideas how to get the plot values and store it in an array???

4 个评论
显示 2更早的评论 隐藏 2更早的评论

Nathan Greco
Nathan Greco 2011-7-26
Please be more precise. Are the values on the plot that you are trying to retrieve the same ones that you used to create the plot? Are you trying to take smaller stepped values from the plot? Saying (x1,y1) etc. is not very helpful.
Susan
Susan 2011-7-26
Yeah I want the values that created my plot, I want to store it in an array..
Nathan Greco
Nathan Greco 2011-7-26
Are they not already stored in arrays? If I'm not mistaken, that is exactly what your original x and y arrays are. If you wanted them in one array, just concatenate them together as Paulo answered. If you wanted to retrieve that same data from the plot (why? I don't know), follow Walter's method, replacing his "h = find(gca,'type','line');" with "h = findobj(gca,'type','line');". If this doesn't work for you, please say why not.
Susan
Susan 2011-7-26
Oh thank you very much.. I don't know why I was trying to work on the very long way.. Paulo's method worked.. Thanks a lot.. I was well confused :)

请先登录，再进行评论。

类别

在 帮助中心 和 File Exchange 中查找有关 Creating, Deleting, and Querying Graphics Objects 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