how to get/extract x,y values from scatter function

Question

SatyaPrakash Gupta 2020-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/508892-how-to-get-extract-x-y-values-from-scatter-function

评论： SatyaPrakash Gupta 2020-3-6

采纳的回答： Bhaskar R

Hi,

I am currently plotting the X,Y coordinates using scatter function as below.

scatter(x(:,1),x(:,2),[],x(:,3),'filled')

I would like to get the x,y value which is being plotted with different colors, could you please do help me out here.

thank you.

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Answer 1

Bhaskar R 2020-3-5

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https://ww2.mathworks.cn/matlabcentral/answers/508892-how-to-get-extract-x-y-values-from-scatter-function#answer_418599

在 MATLAB Online 中打开

You need to apply thresholding to the 3rd column of the x variable upto blue colour as it is normalized colour. If you apply colourbar to the plot you can get idea how to choose threshold value

Demo:

>> x = rand(10, 2); % X, Y data
>> x(:, 3) = 1:10;  % colour data where 1 indicates complete blue, 2 - somewhat diluted colour so it is normalized
>> ax  = scatter(x(:,1),x(:,2),[],x(:,3),'filled');colorbar;

If you see the colorbar is the axes upto 5 level values are blue as you require, so get the values using CData properties of ax

>> x_values = ax.XData(ax.CData <5);
>> y_values = ax.YData(ax.CData <5);

Hope you get my point

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Bhaskar R 2020-3-5

For the understanding purpose i included colorbar

SatyaPrakash Gupta 2020-3-6

I think adding colorbar to the code will help to determine the range of the color , therefore it is a good idea to add colorbar

if there is a for loop for 6000 times and the 3rd element keeps changing , as soon as the loop is finished , then we can get the total limit /range of the colorbar , please do correct me if my udnerstanding is wrong ?

Also i would like to define the threshold between -10 to 10 , how can i do it because the code provided by you takes only one comparision ?

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