cannot extract data from figure with multiple lines

Hello,

I have a matlab figure with muliple lines in it that I am trying to extact. However I can only get the figure line. I am not sure what is wrong. I created the figures in simulink

I am using the following code

fig = openfig('traj.fig');
h = findobj(gca,'Type','line');
y_no_humanX = get(h,'Xdata') ;
y_no_humanY = get(h,'Ydata') ;
close(fig);

when I try to extract the data I only get the first line and cannot get the other lines. I am not sure what is going on.

Any ideas?

Answer 1

[Fangjun Jiang]

The other two "curves" are created using stairs(). use findobj(fig,'Type','Stair') to find those.

fig = openfig('traj.fig');
>> findobj(fig)

ans = 

12×1 graphics array:

Figure         (ScopePrintToFigure)
UIContainer    (PrintLayoutGridContainer)
UIContainer    (PrintContainer)
Panel          (DisplayPanel1)
Legend         (ref, Subsystem/1, Subsystem/3)
Axes           (DisplayAxes1_RealMag)
Stair          (DisplayLine2)
Stair          (DisplayLine1)
Line           (DisplayLine1)
Transform
Transform
Transform

[Nathaniel Goldfarb]

I tried on both the "fig" object and on the path to the figure.

when I try it on the fig object i get an error

when I try it on the path it just prints out the numbers 1-99

[Fangjun Jiang]

see updated answer

[Nathaniel Goldfarb]

Thankyou, this helped a lot. I was able to change the line type from "stair" to "line" and resave the figure.

I was then able to read in the data using my other code. I am sure there is a better way but I only need to do this for two figures so its not that big a deal.

[Fangjun Jiang]

If you have access to the Simulink model and simulation, you could save those data directly using the "To Workspace" block.