How to get legend entries from existing figure ?

Hello,

I am extracting the data from existing figures, this code works for the x, y data, but the Legend variable does not contain any values.

My code:

clear; close all;
addpath(genpath('D:\Uprofily\Blockage\numerika\figures'));
fig1 = openfig("cl_mean.fig");
Legend = findobj(gcf,'Type','Legend')
% data extract
dataObjs1x = findobj(fig1,'-property','Xdata'); % data X
xdata = dataObjs1x(1).XData; 
dataObjs2y = findobj(fig1,'-property','Ydata'); % data Y
y1 = dataObjs2y(1).YData; % line y1
y2 = dataObjs2y(2).YData; % line y2
save("cl_mean.mat"); 

How do I get the legend entries, i.e. the "rect2 Comsol 2d, v=2.8, greatdomain" and some designation which entry belongs to which line ?

Thank you. Petr

Answer 1

[Matt J]

The legend's String property will get you the legend labels for the different lines, e.g.,

plot(rand(5,3)); L=legend;

L.String

ans = 1×3 cell array
    {'data1'}    {'data2'}    {'data3'}

EDIT: Handles to the original line data can be recovered from,

Hlines  = L.PlotChildren

Hlines = 
  3×1 Line array:

  Line    (data1)
  Line    (data2)
  Line    (data3)

[Petr Michalek]

I have another issue with this, when I load the resulting file cl_mean.mat in another script, it also opens the figure, but I dont want this to happen. How do I prevent this? I need only to load the data into a structure.

[Matt J]

Use the syntax,

openfig(___,visibility)

[Petr Michalek]

When I load only the variables xdata, y1, y2, String and PlotChildren, the figure fig1 does not open, so this is also a solution.