Exclude a portion from a scatter plot

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Rivu 2023-7-26

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https://ww2.mathworks.cn/matlabcentral/answers/2000767-exclude-a-portion-from-a-scatter-plot

评论： dpb 2023-7-27

Can someone please suggest an efficient way to remove the more red part which is lying on the outer side of the yellow curve ?

This is a Xi2 vs Rigidity distribution (scatter plot) for some events. The axes are in log scale.

I need to introduce a function in this scatter plot to remove the outer yellow part from the whole plot.

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Rivu 2023-7-26

编辑：Rivu 2023-7-26

Okay, I apologise for the less information provided.

Here is the brief description of what the plot is : Using matlab , a selection criteria has been developed to distinguish between anti particles and particles. A data is generated when the program is processed. The data contains information about the Rigidity , DeDx , beta (velocity), xi2 etc of the particular particle.

An instance is depicted in the snap below ;

From the data obtained , the values are plotted in a scatter plot to visualize the distribution of Xi2 as a function of Rigidity(Rig) . The x and y axis have been plotted in log scale .

Here blue dots are values of particles and red dots are absolute values of antiparticles.

Now the main objective is to introduce a function in the code so as to exclude most of the antiparticles. From the plot it is observed that 97% of the antiparticles allign in the exterior diagonal portion of the distribution. So with that yellow line (which I have painted afterwards), I wanted to refer to the part of the plot which I want to exclude.

Therefore in a sentence , I want a suggestion as to how to exclude a diagonal portion of a log log scatter plot using Matlab.

I hope I was able to make some sense.

dpb 2023-7-27

Attach a .mat file with the data, not just images; nothing can be done with them but look...even better would be to add the code to generate the present figure (w/o the line is ok).

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