Plotting only SOME of the points on a curve

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arvind ramasamy
arvind ramasamy 2017-12-6
回答： Image Analyst 2017-12-18
I plot a voltage (12.4 to 10.8) over time from a instrument. Now i want to introduce markers only at the set points where it changes. So how to introduce the markers for it.
plot(Test1.U_Batt, 'o-', 'linewidth',0.5, 'markersize',5, 'markerfacecolor','g')
I used this command and it showed all the points in the curve. But I want them to show for only some of the points.
Can any one help me out???

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回答（2 个）

Benjamin Kraus
Benjamin Kraus 2017-12-6
编辑：Benjamin Kraus 2017-12-6
What version of MATLAB are you using? There is a new feature, introduced in R2016b that allows you to specify which vertices in a line to mark. Look on the Line Properties doc page for the MarkerIndices property.
The example in the R2016b Release Notes looks like this:
x = linspace(0,10,500);
y = sin(x);
plot(x,y,'-o','MarkerIndices',1:10:length(y))
If you are using an older version of MATLAB, the only solution is to plot two different lines:
  1. One line that has no markers but includes all the data points.
  2. A second line that has no line style, has a marker, but only includes the points you want to mark.
Image Analyst
Image Analyst 2017-12-18
Just pass in the indexes that you want to plot
y = Test1.U_Batt;
plot(y(desiredIndexes), 'o-', 'LineWidth',0.5, 'MarkerSize',5, 'MarkerFaceColor','g')

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