[R-sig-Geo] Error using spsample on SpatialLines in Linux OS

[MacQueen, Don]

The code also works fine on my Mac, and an RHEL (linux) machine to which I have access (though both are still at R 3.4.2 and sp_1.2-5).

You could focus in on the problem a bit by trying the following (I expect you will see the same error)

> sp::LineLength(pts)
[1] 123.0096

Starting with spsample(), and drilling down, eventually LineLength() calls the C function sp_lengths.  LineLength() is pretty simple, and I don't see any evidence that it depends on other packages. I'm not the expert that Edzer is, but it pretty much looks like an installation problem with sp, sorry to say. I can't think of anything else...

Sorry I'm not more helpful,
-Don


> sp::LineLength(pts, sum=FALSE)
[1] 15.81139  7.81025 42.37924 57.00877

> SpatialLinesLengths(L)
[1] 123.0096

> LinesLength(L at lines[[1]])
[1] 123.0096


> sessionInfo()
R version 3.4.2 (2017-09-28)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: OS X El Capitan 10.11.6

Matrix products: default
BLAS: /Library/Frameworks/R.framework/Versions/3.4/Resources/lib/libRblas.0.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.4/Resources/lib/libRlapack.dylib

locale:
[1] C

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] sp_1.2-5

loaded via a namespace (and not attached):
 [1] compiler_3.4.2     colorspace_1.3-2   scales_0.5.0.9000  lazyeval_0.2.1    
 [5] plyr_1.8.4         rgdal_1.2-13       tools_3.4.2        gtable_0.2.0      
 [9] tibble_1.3.4       Rcpp_0.12.14       ggplot2_2.2.1.9000 grid_3.4.2        
[13] rlang_0.1.2        munsell_0.4.3      lattice_0.20-35   

--
Don MacQueen
Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062
Lab cell 925-724-7509
 
 

On 4/26/18, 9:52 AM, "R-sig-Geo on behalf of Glenn Stauffer" <r-sig-geo-bounces at r-project.org on behalf of gestauffer at gmail.com> wrote:

    Do you mean the sp package? I should have mentioned that I already tried
    that.
    
    -----Original Message-----
    From: R-sig-Geo [mailto:r-sig-geo-bounces at r-project.org] On Behalf Of Edzer
    Pebesma
    Sent: Thursday, April 26, 2018 11:35 AM
    To: r-sig-geo at r-project.org
    Subject: Re: [R-sig-Geo] Error using spsample on SpatialLines in Linux OS
    
    I would try reinstalling the package.
    
    On 04/26/2018 06:31 PM, Glenn Stauffer wrote:
    > I ran across a problem when trying to use spsample to sample points 
    > along a line, while in a Linux OS (Mint 18.3). The following code 
    > (which works fine in Win 10):
    > 
    >  
    > 
    > pts <- matrix(c(c(6000,6015,6021,6035,6050),
    > c(6000,5995,6000,6040,6095)),5,2,byrow=FALSE)
    > L = 
    > SpatialLines(list(Lines(list(Line(coordinates(pts))),"X")),proj4string 
    > =
    > CRS("+init=epsg:3071"))
    > plot(L)
    > Lsamp <- spsample(L,10,type="regular",offset=0.5) # this is the line 
    > that generates the error
    > 
    >  
    > 
    > produces the following error:
    > 
    >  
    > 
    > Error in .C("sp_lengths", x, y, n, lengths, lonlat, PACKAGE = "sp") : 
    >   "sp_lengths" not available for .C() for package "sp"
    > 
    > Could this be related to some wrong versions of certain dependencies 
    > (e.g., GDAL)? I don't know much about that, but I did run into that 
    > issue with trying to install other packages (rgeos, sf). In any case, 
    > how can I prevent this error?
    > 
    >  
    > 
    > Thanks,
    > 
    > Glenn
    > 
    >  
    > 
    >  
    > 
    > 
    > 	[[alternative HTML version deleted]]
    > 
    > _______________________________________________
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    > 
    
    --
    Edzer Pebesma
    Institute for Geoinformatics
    Heisenbergstrasse 2, 48151 Muenster, Germany
    Phone: +49 251 8333081
    
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