nc_varidΒΆ
nc_varid returns the ID of a netCDF variable when given its name.
-
varid = nc_varid(ncid, ssName)
Return Value
varid is the ID of the variable ssName. If an error occurs, varid is -1.
Parameters
-
ncid Identifies the netCDF file.
-
ssName ssName is the name of the netCDF variable.
Comment
In UniPlot 5.14.5 channel names may contain the following special characters:
., -, +, $, #, ~, !, ^, &, %. To
avoid problems with the formula interpreter, data exchange or compatibility
problems, the channel name can be used with underscores instead of the special
characters. Example: A NC-file contains a the channel AI50%+m.
The following two calls will return the correct, identical varid:
varid = nc_varid(ncid, "AI50%+m");
varid = nc_varid(ncid, "AI50__m");
If the NC file contains channel names which only differ in special characters
the function may return different varids. The reason is that the function
returns the first channel id that matches the channel name. Example: A NC
file contains the following two channels AI50%+m (varid 0) and
AI50%-m (varid 1):
The following call will return the varid = 1:
varid = nc_varid(ncid, "AI50%-m");
If called with two underscores the function returns the varid of AI50%+m,
varid = 0:
varid = nc_varid(ncid, "AI50__m");
To avoid problems, all channel names should be unique even if the special characters are replaced by underscores. If the NC files are created with UniPlot, the channel names which are only different in the special characters are enumerated, starting with 0. The first channel name will be unmodified.
History
| Version | Description |
|---|---|
| 5.14.5 | Special characters in channel names |
See also
id-576645