Extract scattered data from fig
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I want to extract data from a lot of graph fig files. My data are consist of scattered points in a graph. I used the code below however there is nothing in the x and y variables. How to fix this?
clc
clear all
addpath(genpath('PIV TEST 2'))
for k = 2:21
h = openfig(sprintf('%d.fig',k));
h = findobj(gca,'Type','line');
x = get(h,sprintf( 'XData',k));
y = get(h, sprintf('YData',k));
end
Is there anything wrong in my coding?
2 个评论
Adam Danz
2019-5-13
Are the figures opening? Do you get any error or warning messages? Have you tried running the loop through manually and looking at what happens on each line? What have you done so far in the problem solving phase?
These two lines are definitely wrong.
x = get(h,sprintf( 'XData',k)); % should be get(h, 'XData')
y = get(h, sprintf('YData',k)); % same
Also, you're not storing the loop variables anywhere. They are being overwritten on each loop.
Lots of stuff to fix here.
mariana mahamud
2019-5-14
采纳的回答
Here is a cleaned-up version of your code that finds any and all objects in the specified figure that contain an "XData" property. It will work no matter how the plots were produced (line, scatter, etc).
I suggest storing the (x,y) values in a cell array.
x = cell(20,1);
y = x;
for k = 2:21
fh = openfig(sprintf('%d.fig',k));
h = findobj(fh,'-Property', 'XData'); %any object with property "XData" on figure fh
x{k} = get(h,'XData');
y{k} = get(h,'YData');
end
If more than one object was located, x and y will be a cell array containing one element for each object.
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