gnuplot中的直方图上的平滑线 [英] Smooth line on histograms in gnuplot

问题描述

我想在直方图上画一条平滑的线.到目前为止，我已经尝试了所有平滑函数，但无法获得结果.

I want to make a smooth line over histograms. So far I have tried all the smooth functions but I am not able to get the result.

对于我正在使用的直方图:

For the histograms I am using:

plot "file.scatter" u (hist($2,width)):(1.0) smooth freq w boxes notitle

，结果为:

但是当我要求gnuplot在上面绘制一条平滑线时:

But when I ask gnuplot to draw a smooth line over these:

plot "file.scatter" u (hist($2,width)):(1.0) smooth freq w l notitle

我得到:

我希望线图看起来像概率密度函数一样平滑(当然，这些值必须归一化).

I want the line plot to look smooth like a probability density function(of course the values will have to be normalized).

有任何线索专家吗?

推荐答案

您需要进行卷积，如果您使用的是gnuplot(> = 5.1)的最新版本，则可以使用kdensity

You need to do a convolution, if you have a recent version of gnuplot (>=5.1) you can plot with kdensity

plot $DATA smooth kdensity [bandwidth n] with boxes

请记住，最新版本的gnuplot也可以使用bins功能对直方图进行合并.

Keep in mind that recent versions of gnuplot can also do the binning for the histogram with the bins feature.

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