MATLAB: How to show ‘Marker symbol’ for specific values on 2D-plot

arrayMATLABmatrix arrayplot

In a plot of x (array with 6000 values) and f(x) (also array with 6000 values) I want to show 'Marker symbol' for specific values on 2D-plot? for example, show Marker symbol for f(x) at x(1000) or 2000,3000,4000,…on f(x) plot.

Best Answer

With newer MATLAB you can use the MarkerIndices property; see https://www.mathworks.com/help/matlab/creating_plots/create-line-plot-with-markers.html#bvcbmlx-1

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MATLAB: Plotting array elements in different colors

x=1:1500;
y=rand(1,1500);
plot(x(1:500),y(1:500),'r')
hold on
plot(x(501:1000),y(501:1000),'b')
plot(x(1001:1500),y(1001:1500),'k')
hold off

MATLAB: How to remove markers in plot at specified places

If the goal is to remove all of the markers except for the 'outer' ones, then try this. This should be relatively generic (independent of the size specified by nx and ny), if not elegant.

Replace this line:

plot(X,Y,'ro',Y,X,'ro','MarkerFaceColor',[1,0.6,0.6]);

with these two lines:

Youter(2:end-1,2:end-1)=NaN;
plot(X, Youter, 'ro', 'MarkerFaceColor', [1, 0.6, 0.6])

If I misinterpreted your goals, post a comment making them more clear.

Best Answer

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MATLAB: Plotting array elements in different colors

MATLAB: How to remove markers in plot at specified places

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