Extracting data points from subplots

Hi everybody.

I've run into a pretty big problem with saving data. I was running some tests with a few sensors and accidentally typed in %d\n instead of %d \n. Now I've lost part of my data and the data I did collect is all in one line (i.e. not separated by the \n).

I do however still have the figure pulled up. It has 3 subplots on it with 3 different data sets. These data sets are not predefined, however. I didn't simply plot them all at once, but rather as they came in from my sensors. I was wondering if there was a way to extract each data point from each subplot individually and store it in a neatly organized fashion.

Thanks!

Answer 1

[Star Strider]

Yes, there is.

FIRST: save your plot as a .fig file. The easiest way to do this is from the plot figure window itself. Click on the floppy disk icon, then choose to save it as a .fig file, and give it some sort of descriptive name. That saves all the data that created it, so you will still have all your data. You can the extract and write it to a .mat file.

Second, to refer to each subplot as the appropriate subplot.

For example:

sp1data = findobj(subplot(3,1,1), 'Type', 'line')

That should get you started.

Save the figure as a .fig file first, then experiment with getting the data from it.

[Rodmehr Semnani]

Thanks! I actually tried this method from here and I found a cell of 3 Lines, but it turns out that trying to extract XData or really any data from these lines overloads the memory of the computer. I think I'm just going to have to redo the tests.

For anybody wondering how to do it with data on subplots, you have to save each line from the cell in dataObjs (from the above link) to a separate variable. Mine just happened to be too big for my computer.

Cheers!

[Star Strider]

My pleasure!

The original in that post refers to getting data from figures in R2014a and previous versions.

Walter Roberson’s Comment refers to getting data from figures in R2014b and later versions. (This is similar to my solution.)

The differences are significant, and what works for R2014a and previous versions (using HG1) will not work in R2014b and later versions (using HG2).

You must have collected a significant amount of data. Your sampling frequency has to be twice the highest frequency component of interest in the signal you’re sampling. More is ‘oversampling’, and while useful isn’t necessary.

[Zakia wani]

i have the same problem.. my c1.fig file has 11 subplots.. i want to extract data from each subplot as each of them represents a different dataset. i was using f= open (‘c1.fig’); h = findobj (f,’type’,’line’); y1 = get (h(1),’Ydata’); y2 = get (h(2),’Ydata’); y3 = get (h(3),’Ydata’); y4 = get (h(4),’Ydata’); y5 = get (h(5),’Ydata’); y6 = get (h(6),’Ydata’); y7 = get (h(7),’Ydata’); y8 = get (h(8),’Ydata’); y9 = get (h(9),’Ydata’); y10 = get (h(10),’Ydata’); y11 = get (h(11),’Ydata’); then i was plotting.. but matlab is just extracting data from the last subplot and putting it in all subplots… what should i do.. any idea would be grateful

Thanks