How to get a 2D matrix estimate from Ksdensity for bivariate data

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Hammam Orabi 2020-10-16

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评论： Nagasai Bharat 2020-10-23

Hello,

I'm trying to get the function ksdensity to return a matrix instead of a vector when I use it for a bivariate input (signal of I and Q).

The problem is that ksdensity only returns a vector even if the points are inputted as a 2 column matrix.

Can anybody help ?

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Answer 1

Nagasai Bharat 2020-10-21

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Hi,

From my understanding you are trying to get a 2D output from the bivariate data and using the ksdensity function you are getting a vector. The following MATLAB Answer would likely help you achive your objective.

https://www.mathworks.com/matlabcentral/answers/18365-kernel-density-for-2d-data?s_tid=srchtitle

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Hammam Orabi 2020-10-21

Hi,

You are right in your understanding. But the difference is that for my data (Baseband modulated signal) the variables are not independent, that's why I cant generate KSD for each var and multiply their pdfs.

Nagasai Bharat 2020-10-23

Hi,

There is an entry in the file exchange that does 2-d kernel density esimation:

http://www.mathworks.com/matlabcentral/fileexchange/17204-kernel-density-estimation

You could try this.

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How to get a 2D matrix estimate from Ksdensity for bivariate data

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