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25 results for “from:xin wei”

how to parse out string separated by special character
xin wei · Jun 7, 2010 · r-help

hi, everyone: i have a data frame with one single character column as followings: DS_xxx_yyy_24hr_zzz_1 DS_xxx_yyy_24hr_zzz_2 DS_xxx_yyy_24hr_zzz_3 DS_xxx_yyy_24hr_zzz_4 DS_xxx...

help for reshape function
xin wei · Jun 17, 2010 · r-help

hi, everyone: i have a question on the reshape function. i have the following dataset : gene tissue patient1 patient2 patient3............. _________________________________________________ gene1 breast 10 20 50 gene2 breast 20 40 60 gene3 breast 100 200 300 which i hope to convert...

why I could not reproduce the Mandelbrot plot demonstrated on R wiki
xin wei · Sep 24, 2010 · r-help

I am trying to reproduce the nice looking of Mandelbrot demonstrated by R wiki page by the following code: library(caTools) # external package providing write.gif function jet.colors = colorRampPalette(c("#00007F", "blue", "#007FFF", "cyan", "#7FFF7F", "yellow", "#FF7F00", "red", "#7F0000...

a question on sqldf's handling of missing value and factor
xin wei · Mar 2, 2011 · r-help

Dear Mr. Grothendieck : thank you so much for your attention. You are the real expert here. the following is a mock text file: a b c aa 23 aaa 34 aaaa 77 note that both b and c column contain...

why I could not reproduce the Mandelbrot plot demonstrated on R wiki
xin wei · Sep 25, 2010 · r-help

hi, peter: thank you for your attention. adding the line you suggested did display the static Mandelbrot plot with good resolution on R graphics device. However, the resulting gif file still come out ugly. the R wiki page I was...

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