How to plot a large data set with markers to differentiate two overlapping lines?

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KaMATLAB
KaMATLAB 2021-1-10
编辑： KaMATLAB 2021-1-11
Hi, Please I have large data sets to plot. The data sets is more than 100, 000 data points. I need to use markers or means of differentiating the lines when printed in balck and white. Reviewers of my work suggetsed that i should use marker. Each time i use marker I get a clumsy and messy plots as shwon below. Now I used colors to diffrentaite the two plots but printing in black and white does not reveal the distintion of the two plots. I have read what @image analyst explained in this https://www.mathworks.com/matlabcentral/answers/57241-plot-large-dataset-with-sample-points#answer_69235 but it is not working for me. I need to be able to differentiate the two plots. The code of my plot is below. The plots are also shown below.
How do i modify the code to get two distinct plots in balck and white?
the first plot is when i used marker. Please note that only one plot dominate due to large data points with marker.
the second plot is when i didnt use any marker but color distintion. However, it dissappears after printing in balck and white.
plot(t,n_d,'r-')
% plot(t,R_react)
% plot(t,T_l)
% plot(t,T_react)
hold on
plot(t,n_r, 'bo')
legend('Desired power','Actual power')
ylabel('Reactor core relative power')
% ylabel('Reactivity due to control rod during load droping')
% ylabel('Exit temperature of coolant during load dropping')
% ylabel('Total reacticity during load dropping')
% plot(t,U)
% ylabel('Control gain')
xlabel('Time (s)')
hold off
norm(Ustc);

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采纳的回答

Alan Stevens
Alan Stevens 2021-1-10
How about plotting every n points. For example
plot(t(1:1000:end),n_d(1:1000:end),'o')
hold on
plot(t(500:1000:end),n_r(500:1000:end),'s')

更多回答（1 个）

KaMATLAB
KaMATLAB 2021-1-10
编辑：KaMATLAB 2021-1-10
Thank you very much for the adjustment and the insight. However, I want the plots to be distinct and the markers to be disticnt as well. They are crowded together. I tried to adjust the interval so that i can have the markers for the different plots at different intervals.
I got the plot below after the adjustment based on your opinion. It seems clumsy and crowded together.
Thank you
Moreover, I want the Linestyle of the two plots to be obvious and the colors to be more distinct. Thank you
  2 个评论
Alan Stevens
Alan Stevens 2021-1-11
编辑：Alan Stevens 2021-1-11
Make the spacing larger! i.e. change the interval to 1500 or 2000, or whatever gives a clearer result.
KaMATLAB
KaMATLAB 2021-1-11
编辑：KaMATLAB 2021-1-11
Thank you very much. I have been able to combine your thoughts and MarkerIndices command. They are both giving desired results.

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