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There is a series of data contains time in fixed step and energy varying with time, how to test its periodicity?In R, it seems there is no direct tools since I have search the R manual with periodic and I have not found any related topic. Thanks a lot

There are 4 sets of array, each have 2 dimension data:x,y. And these data comes from bkde. I tried to plot them in one figure, but details of some lines, like peak and where it locate, have diminished since one set of array have fairly high y value.And another array have lots of y value near zero, like 1e-20, 1e-10, like a long tail, while the highest y value of these arrays is 1e-4. Does R have

...rovide commented, minimal, self-contained, reproducible code. > > > > ------------------------------ Message: 7 Date: Sun, 21 Sep 2008 12:23:02 -0400 From: "stephen sefick" <ssefick@gmail.com> Subject: Re: [R] periodicity validation To: "yuankun shi" <shiyuankun.debian@gmail.com>, "R-help Mailing List" <r-help@r-project.org> Message-ID: <c502a9e10809210923m10728682wf4f8d41e75dce71e@mail.gmail.com> Content-Type: text/plain; charset=UTF-8 alright this is what you want to do. install.packages("fields", dependenci...

I have 3 row data in the format as x,y,time I want to draw it as a 3d picture;x as x axis, y as y axis, the xy's density as z axis, the corresponding time as color. I have read the manual of R and failed, Since kde2d and bkde2d give grid data, this grid data cannot match its original time. Could anyone do me a favor? thanks.

I have searched this forum with keywords contour and percent, it only give one irrelevent result. My problems is how to plot contour in percent. In my figure, I have use kde2d to generate density of an array with two dimension point. Using image and contour could plot it. But the line contour generated represent absolute value of population, not how much pecent point within this cycle. So, i there

I have drawed a picture with persp, it's 3d map with different color, indicate different altitude. In gnuplot, the corresponding command 'splot' will generate a picture beside to indicate the relationship between color and altitude. But in R, how to draw it? I have read the manual of legend, but they are all about how to draw a legend with colored text, not a continuous varing color