How to extract data from a plot (figure)

Hello!

I am trying to extract the data in my figure, when it gets "true" or "false". For example, the image below has a true at 0.4159 and a false at 0.9795. How can I extract this (can be through a script) to get these point all over the plot?

Thank you in advance!

[Mischa Kim]

How did you create the plot?

[Gustavo Araujo]

I did a plot after a Simulink Simulation finished:

plot(Fault.time,Fault.signals.values)

and then reached the graph.

[Mathieu NOE]

hello

the simple code below will give you the x data indexes when above or below a threshold

istrue = find(Fault.signals.values>0.5)
isfalse = find(Fault.signals.values<1e-3)

if you are interested in finding the rising and falling transition index , time and output values, you can use the attached function

level = 0.5;
[ind_pos,t0_pos,s0_pos,ind_neg,t0_neg,s0_neg] = crossing_V7(Fault.signals.values,Fault.time,level,'linear')

[Gustavo Araujo]

Thank you a lot! It worked on what I'm working on!

If I want to place the t0_neg and t0_pos inside another function, what's the right way to do this?

[Mathieu NOE]

hello Gustavo

glad it meets your needs

you can create your own function that use's the crossing function I sent you (call it inside your own function and pass the arguments).

Answer 1

[Cris LaPierre]

You would process the data used to create the plot, not the plot itself. Look at your plot and see if you can identify some characteristic you could use to detect when the signal switches to true and when it switches to false.

I would probably try something using diff(Fault.signals.values), since a change of +1 indicates a switch from False to True, while a change of -1 indicates a switch from True to False.

See this answers post as well.