如何将平滑的Cspline曲线输出为数据文件 [英] How to output smooth cspline curve as a data file

问题描述

有人知道如何为给定数据提取平滑cspline曲线的一些数据吗?

Does anybody know how to extract some data of smooth cspline curve for a given data?

例如，有一个数据文件，其中有2列分别对应于x和y值.我可以通过以下命令绘制具有平滑cpline曲线的数据

For instance, there is a data file which has 2 columns corresponding to x and y values. I can draw the data with smooth cpline curve by the following commands

p 'data' w lp, ""  smooth csplines

我想将平滑的cpline曲线提取为另一个数据文件.

I want to extract the smooth cpline curve as an another data file.

推荐答案

这可以通过设置table来完成.考虑以下数据文件:

This can be done by setting a table. Consider the following data file:

0 1
1 2
2 3
3 2
4 2
5 4
6 8
7 5
8 3
9 1

数据本身及其csplines插值如下:

The data itself and its csplines interpolation look like this:

要将插值打印到表中，请执行以下操作:

To print the interpolation to a table one does the following:

set samples 100
set table "table_100"
plot "data" smooth csplines
set samples 20
set table "table_20"
plot "data" smooth csplines
unset table

set samples确定用于构造样条曲线的点数.您可以将其可视化:

set samples determines the number of points used to construct the spline curve. And you can visualize it:

set key left
plot "data" pt 7 t "Original data", \
     "table_100" w l t "Splines (100 samples)", \
     "table_20" w l t "Splines (20 samples)"

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