Update plot using set() with xData and yData

m j
2020 7 28
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更新时间：2026 4 20
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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?

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jonas
jonas 2020-7-28
What exactly is hPlot3? Is it an array of handles? Are you trying to update 8 line handles?
m j
m j 2020-7-29
编辑：m j 2020-7-29
hAxes3 = subplot(2,2,1);
hPlot3 = plot(hAxes3, nan,nan); This is what it is.

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 采纳的回答

Cris LaPierre
Cris LaPierre 2020-7-29

2 个投票

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))

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Cris LaPierre
Cris LaPierre 2020-7-29
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 2020-7-29
编辑：m j 2020-7-29
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 2020-7-29
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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更多回答（1 个）

Peter Kövesdi
Peter Kövesdi 2026-4-20，11:13

2 个投票

You can also set all Lines at once by making a cell array out of option name and Data:
figure;
pl=plot(1:2048,rand(3,2048))
set(pl,{'XData'},{1:2048},{'YData'},mat2cell(rand(3,2048),ones(1,3),2048))

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