Unfortunately, we will not be able to provide much help
since we have no particular experience with R.
We suggest that you look for R support, R mailing list, and R
google groups and ask your question there.
You can try posting the question to the netcdf-group mailing list;
Perhaps someone may have the requisite R background.
Sorry not to be of more help.
>
> Can you help me with extracting data using this R code from a Netdcf file
> to a dataframe. At the end R gives this error
>
> Error in TX[lat_indices, lon_indices, timeseries] : (subscript) logical
> subscript too long
>
> I have copied the script below. All efforts to find a solutions online have
> not given any results. I greatly appreciate your assistance on this.
>
>
> rm(list=ls())
> gc()
> gc(verbose = getOption("verbose"), reset = T)
> library(ncdf4)
> library(chron)
> library(lattice)
> library(RColorBrewer)
> library(raster) # package for raster manipulation
> library(rgdal) # package for geospatial analysis
> library(ggplot2) # package for plotting
> library(readr)
> library(dplyr)
> library(tidyr)
> setwd("D:/cordex/AFR-44/rcp45/CLMcom-CCLM4-8-17_v1/CNRM-
> CERFACS-CNRM-CM5_r1i1p1/mon/native")
> TXx <- nc_open("D:/cordex/AFR-44/rcp45/CLMcom-CCLM4-8-17_v1/
> CNRM-CERFACS-CNRM-CM5_r1i1p1/mon/native/TXx_AFR-44_CNRM-
> CERFACS-CNRM-CM5_historical-rcp45_r1i1p1_CLMcom-CCLM4-8-
> 17_v1_mon_19510101-20991130.nc")
> print(TXx)
> lon <- ncvar_get(TXx, "lon")
> lat <- ncvar_get(TXx, "lat", verbose = F)
> TX <- ncdf4::ncvar_get(TXx, varid="TXx")
> time <- ncvar_get(TXx, "time")
> time_d <- as.Date(time, format="%j", origin=as.Date("1949-12-01"))
> time_years <- format(time_d, "%Y")
> time_months <- format(time_d, "%m")
> time_year_months <- format(time_d, "%Y-%m")
> head(time_d)
> nc_close(TXx)
> time_months %in% c("06")
> timeseries <- seq(from = as.Date("2020-01-01"), to = as.Date("2060-12-31"),
> by = 'month')
> lat_range <- seq(-22.2716118303, -15.5077869605)
> lon_range <- seq(25.2642257016, 32.8498608742)
> lat_indices <- lat %in% lat_range
> lon_indices <- lon %in% lon_range
> TX[lat_indices, lon_indices, timeseries]
> --
>
> Kudzai Mpakairi
> Research Assistant
> Vision RI
>
> +2637 770 015 38
>
>
=Dennis Heimbigner
Unidata
Ticket Details
===================
Ticket ID: CYJ-220332
Department: Support netCDF
Priority: Normal
Status: Closed
===================
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