Hi,
You problem as stated certainly is puzzling since you have one NCDF file but
'time units are different'. I don't know what to make of that.
If you had a simpler case where data are dimensioned as [x,y,t] then you can
convert dates to index use in ncdf4::ncvar_get()
I would start with a look-up-table of the dates in the file.
lut <- seq(from = as.Date("1850-01-01"), to = as.Date(Sys.Date()), by = 'day')
The use base::findInterval() to convert your start/stop dates to indices.
mine <- as.Date(c("1971-01-01", "1990-03-01"))
startstop <- findInterval(mine, lut)
Is that at all close to what you seek?
Ben
> On Mar 23, 2017, at 6:07 AM, കുഞ്ഞായി kunjaai <dileepkunj...@gmail.com> wrote:
>
> Dear All,
>
> I am trying to extract a time series from a netCDF file.
>
> I want to extract data for the time period 1971-1 to 1990-12-31 only.
>
> time axis units is 'days since 1850-1-1'
>
> For one or two files I can use "count" argument, but I have more than 100
> such files and its time units are different.
>
> Is there any easy way to extract the particular time period using ncdf4
> package?
>
> Thank you in advance.
>
> --
> DILEEPKUMAR. R
> J R F, IIT DELHI
>
> [[alternative HTML version deleted]]
>
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Ben Tupper
Bigelow Laboratory for Ocean Sciences
60 Bigelow Drive, P.O. Box 380
East Boothbay, Maine 04544
http://www.bigelow.org
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