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On Wed, Feb 15, 2012 at 3:04 AM, uday <uday_143...@hotmail.com> wrote:
> Hi ,
>
> Thanks for reply
>
> My latitude and longitude contains 90000-100000 observations per file
> when I run coords <- expand.grid(lat=1:5,long=1:5) then my computer
>
You don't have to run this part. As your original post did not provide
any details on data, coords is only a toy example.
> *** caught segfault ***
> address 0x6951c20, cause 'memory not mapped'
>
> Traceback:
> 1: .C("spline_eval", z$method, nu = as.integer(n), x =
> as.double(xout), y = double(n), z$n, z$x, z$y, z$b, z$c, z$d, PACKAGE =
> "stats")
> 2: spline(gam.data$x[, col.data], gam.smooths.all$fit[, m], xout =
> gam.results.global[m, , "x.values"], ties = mean)
> 3: eval.with.vis(expr, envir, enclos)
> 4: eval.with.vis(ei, envir)
> 5: source(file.path(getwd(), "Skripte", "r",
> "GAM_hourly", "1_calcs_GAM_all_sites_hourly.R"), echo =
> TRUE, max.deparse.length = 2e+05)
>
> Possible actions:
> 1: abort (with core dump, if enabled)
> 2: normal R exit
> 3: exit R without saving workspace
> 4: exit R saving workspace
>
I doubt expand.grid was the cause of this crash, and I see no
reference to it in traceback.
> so is there any other way to deal with this ?
> My main objective to plot this observations on global map
> the sample data is
> lat <- -11.3082 -11.6041 -11.9002 -12.1961 -12.1461 -12.7881 -12.6657
> -12.8467 -13.7233 -13.6271
> lon<- 135.6423 135.5799 135.5184 135.4558 133.5313 135.3321 134.6688
> 133.9839 132.0651 131.5528
> gas <- 1688.91 1679.24 1677.77 1635.60 1652.77 1663.43 1642.16 1671.84
> 1674.65 1665.54
>
Your lat,long do not seem to be forming a uniform grid. ?image would
probably spit an error about "increasing x and y" or something similar
(no access to R on this machine).
You could try
library(lattice)
levelplot(gas~lat+long,data=yourdata) # data argument is optional
-only if lat,long,gas are columns of a data frame
You may also want to look at the maps package for projections of lat/long
Hope this helps
> --
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>
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