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Update plot using set() with xData and yData

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m j
m j on 28 Jul 2020
Commented: Cris LaPierre on 29 Jul 2020
Hello,
Im trying to set a plot handle by updating its xData and ydata.I have a 2048X8 array of doubles called normWanted = 2048X8 of double type.
Ive tried:
set(hPlot3, 'Xdata',1:2048,'Ydata',normWanted);
I get the error"Value must be a vector of numeric type"
Now if I try: set(hPlot3, 'Xdata',1:2048,'Ydata',normWanted(:,1)); <- this works but only plots 1,would like to plot all 8 arrays
Any ideas on how to plot this using set or a better way,I have a figure with multiple subplots so?

  2 Comments

jonas
jonas on 28 Jul 2020
What exactly is hPlot3? Is it an array of handles? Are you trying to update 8 line handles?
m j
m j on 29 Jul 2020
hAxes3 = subplot(2,2,1);
hPlot3 = plot(hAxes3, nan,nan); This is what it is.

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Accepted Answer

Cris LaPierre
Cris LaPierre on 29 Jul 2020
When you plot multiple lines in a single plol, your handle is an array of line objects, one for each line. If you want to use the XData and YData properties, you must first create a line object for each data set you want to display. Then you would have to update the XData and YData properties of each line one at a time.
hPlot3 = plot(hAxes3, nan,nan, nan,nan, nan,nan, nan,nan, nan,nan, nan,nan, nan,nan, nan,nan);
set(hPlot3(1),'XData',1:2048,'YData',normWanted(:,1))
set(hPlot3(2),'XData',1:2048,'YData',normWanted(:,2))
...
set(hPlot3(8),'XData',1:2048,'YData',normWanted(:,8))

  3 Comments

Cris LaPierre
Cris LaPierre on 29 Jul 2020
I assume you have your reasons for doing it this way, but you could also achieve this with a single plot command:
subplot(2,2,1)
plot(1:2048,normWanted)
Note that it is not necessary to specify the axes. The subplot command sets the associated axes as the current axes, and by default plot command adds the line to the current axes.
m j
m j on 29 Jul 2020
You assumed wrong lol! I didnt know that it wasnt necessary to specify the axes,and that subplot and plot worked this way.....dafaq lol!
This works, And it works when updating plot and changing background of plot using: set(gca,'color','black');......Thank you kind sir.
Unless you can think of a better way? My goal so far, is to just plot signals in a axes after I have padded them.Pretty simple.
Cris LaPierre
Cris LaPierre on 29 Jul 2020
If you haven't already done so, I suggest going through Chapter 9 of MATLAB Onramp. It doesn't get this in depth, but it does give a good intro to plotting in MATLAB, and only takes about 15 minutes.

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