[R] get a dataframe subset based on time interval

Hi, I have a big dataframe with a POSIXct column and I'd like to extract a subset contained in a given time interval, from Date 1 to Date 2. Paulo E. Cardoso __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listi

[R] Skip loop combination when one factor's level is missing

Hi, In a symmetric design one may have a data.frame with, say, two factors (two columns), each one with n levels. In a nested loop, to run a expression combining levels of each factors, to produce a new data.frame, if one level is absent, the loop is interrupted; one gets a empty object.

[R] system() how to make a program run a specific file

I'd like to know how to call a program to run or open a specific file. something like this: system('"C:\\Program Files (x86)\\IrfanView\\i_view32.exe"','-A:\\ teste.jpg') is not working. any help will be appreciated Paulo E. Cardoso

Re: [R] system() how to make a program run a specific file

After all it's very easy: system(paste('"C:\\Program Files (x86)\\IrfanView\\i_view32.exe"','A:\\test.jpg')) Paulo E. Cardoso > -Mensagem original- > De: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] > E

[R] system() how to make a program run a specific file - RUN and Output directory issues

I have a particular case where the program I'm calling needs a additional instructions, to click a RUN button and set a output directory. Could these options be controlled with system() function? Paulo E. Cardoso > -Mensagem original- > De: r-help-boun...@r-

[R] while( ) to get a vector until the sum of elements are <= X ?

h the difference to achieve the constrain. I don't know how to achieve this. with a while? ____ Paulo E. Cardoso [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listi

Re: [R] how to export image (TIF, BMP or JPG) from SpatialGridDataFrame or SpatialPixelDataFrame

I'm trying to export a SPDF to a image. The original file, when imported into R (JPG with rGDAL) have dimension = 997x997. When I save as bmp the image(spdf), i get a 672x672 image. Paulo E. Cardoso __ R-help@r-project.org mailing

[R] paste (" " x " ")

maybe a very basic question but I need to parse an SQL code into a GIS from a ODBC conn. The code includes a specific sentence OPTIONS COORDSYS("Latitude / Longitude"); and I need the " " pasted into the string. They cannot disappear. how to do this? ______

[R] Quotes - useFancyQuotes

ORDSYS( \"Surface 1\" AS COMPONENT);" And it's not readable as SpatialSQL code by GIS How to deal with this problem? ____ Paulo E. Cardoso Paulo E. Cardoso [[alternative HTML version deleted]]

[R] Convert RGB-sRBG

Hi, How can I convert from 8-bit RGB color to [0-1] interval (sRGB) and vice-versa? Thanks in advance Paulo E. Cardoso [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman

[R] Test for Temporal autocorrelation in GPS obtained points

given correlation value. I don't know if time can be used with as x-variable in moran.test(). Thanks in advance ____ Paulo E. Cardoso [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.

[R] color vectors other than gray()

;,cex=0.6) plot(blocos,ol="grey40",fg=NA,add=T) I'd like to replace the grey shade by other colors. Thanks in advance Paulo E. Cardoso [[alternative HTML version deleted]] __ R-help@r-project.org mai

Re: [R] color vectors other than gray()

ng level accordingly to the abundance value (level). I don't know how to proceed. ________ Paulo E. Cardoso -Mensagem original- De: baptiste auguie [mailto:ba...@exeter.ac.uk] Enviada: sexta-feira, 27 de Março de 2009 13:30 Para: Paulo E. Cardoso Cc: r-h...@stat.math.ethz

Re: [R] color vectors other than gray()

)#! Legenda text(245300,130500,"Nº Indivíduos",cex=0.6) plot(blocos,ol="grey40",fg=NA,add=T) Paulo E. Cardoso -----Mensagem original- De: baptiste auguie [mailto:ba...@exeter.ac.uk] Enviada: sexta-feira, 27 de Março de 2009 14:50 Para: Paulo E. Cardoso Cc

Re: [R] color vectors other than gray()

Petr, I'd like to be able to change the ramp to other than grey shades. Please see my previous message with some data. Paulo E. Cardoso -Mensagem original- De: Petr PIKAL [mailto:petr.pi...@precheza.cz] Enviada: sexta-feira, 27 de Março de 2009 15:12 Para: Pa

[R] print table (data.frame) to pdf

How can I print a data.frame to a PDF with pdf()...dev.off() Paulo E. Cardoso [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting

[R] plot Geotiff

Is there a way to plot Geotiff, combining it with spatial (vector) data? Paulo E. Cardoso [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read

[R] how to control lattice plot parameters

rey","blue","green")) ) ) A few controls are not responding and I don't know how to: 1) control cex for xlab and ylab 2) control position of legend 3) control lty for each group level 4) control plot groups colors 5) match lege

[R] Extract Time in POSIXct

Assunto: Extract Time in POSIXct I have a dataframe with a column [hora] with this format: hora: POSIXct, format: "1899-12-30 14:30:00" It was obtained reading a access2007 database table. Can I extract the time from each entry, keeping the POSIXct format? ______