How to create a plot with highlight (holes) based on Y value and colored density map based on X value

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Minghao Dong 2021-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/1599804-how-to-create-a-plot-with-highlight-holes-based-on-y-value-and-colored-density-map-based-on-x-valu

评论： Voss 2021-12-2

采纳的回答： Voss

Hi Team,

can you please teach me how to plot the following

I start with 2 sin function addition.

>> t = [0:0.0001:0.4*pi];

y=cos(100*t) + cos(110*t);

plot (y)

Then can you please help me with

highlight the data points with bubble whose Y value is less than 0.5 but great than -0.5 (as in the pic below)
include a density heat map along the X axis with the relative density of the highlighted data points. (red means the highlighted data is very concentrated and blue means the highlighted data is very scarce)

The plot attached is more or less capture the requirement 1.

Thank you

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Voss 2021-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/1599804-how-to-create-a-plot-with-highlight-holes-based-on-y-value-and-colored-density-map-based-on-x-valu#answer_844244

在 MATLAB Online 中打开

To do #1, add the following lines of code after your plot(y) line:

hold on
idx = y>-0.5 & y<0.5;
plot(t(idx),y(idx),'o');

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Minghao Dong 2021-11-30

Hi Benjamin

Thanks for your response!

I have tried some search and found something very close to the relative density but I can not extract it out as the vecter d with the same size as t for some reason.

//here are my code//

t = [0:0.0005:1.2];

y=cos(100*t) + cos(110*t);

plot(t,y)

hold on

idx = y>-0.5 & y<0.5;

plot(t(idx),y(idx),'o');

axis tight

h=scatterhist(t(idx),y(idx),'kernel','on');

delete (h(3))

% The original plot(t,y) was removed by h=scatterhist(t(idx),y(idx),'kernel','on');. So I re-plot it as following

hold on

plot (t,y)

% The axis can not capture all the plot I want to demonstrate. So i added

axis([0 1.2 -2 2])

%The plot is actually moving todards at the right direction but there is a error

Error in scatterhist/scatterhistXYLimCallback (line 527)

set(hYHist,'XLim',get(hScatter,'YLim'));

Q1: Do you know how should I debug above error or work around it?

Q2:

h=scatterhist(t(idx),y(idx),'kernel','on');

delete (h(3))

Shows the density on X axis, but h is just a 1X3 array.... Do you know anyway I can extract the array form here?

Thanks again!

Minghao Dong 2021-12-2

Thanks great!

You are the man!

Thank you!

Voss 2021-12-2

Great, glad it's working! Do you mind marking my answer as Accepted so that the question doesn't show up when other users browse unanswered questions (and also so I get credit for an accepted answer, of course)? Thanks!

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