j - J 中是否实现了三次样条插值方法？

Question

我是 J 的新用户，我只是想知道 J 包中是否实现了三次样条插值方法？

Answer 1

我自己不熟悉，但是我确实安装了所有的包，所以

$ rg -l -i spline  /usr/share/j/9.02/ -g '*.ijs'
/usr/share/j/9.02/addons/math/misc/spline.ijs
/usr/share/j/9.02/addons/stats/rlibrary/manifest.ijs
/usr/share/j/9.02/addons/stats/rlibrary/splines.ijs
/usr/share/j/9.02/addons/stats/rlibrary/test_splines.ijs
/usr/share/j/9.02/addons/math/misc/manifest.ijs
/usr/share/j/9.02/addons/graphics/plot/jzplot.ijs
/usr/share/j/9.02/addons/demos/wdplot/plexam.ijs

math/misc/spline 和 stats/rlibrary/splines 看起来不错，后者虽然与 R 接口(interface)。前者以实现开始:

NB. =========================================================
NB.*cubicspline v Calculate cubic spline
NB.
NB. y is: 2-row matrix  x ,: f(x)
NB.
NB. result: x values;coefficient matrix,one row per interval.
cubicspline=: 3 : 0
...

要将此包放到适合您安装 J 的位置，请使用 Package Manager .