The error message means that the variable is already created, you cannot create
it twice.
Delete the file, and try again.
An example of grid writing, taken from the ncwrite() help page:
nccreate(filename, 'mat', 'Dimensions', list('r', 3, 'c', 4));
ncwrite(filename, 'mat', [1 2 3 4; 5 6 7 8; 9 10 11 12]);
And to read it:
ncread(filename, 'mat');
Simon
Le 05/02/2016 12:26, Lester Anderson a écrit :
Hi Simon,
Hy is a matrix and the input grid used has dimensions of 601 x 601
(x,y). Reading the data in is fine and the matrix is as expected in
the variable browser.
grav = ncread(source,'z') is all fine with a 601 x 601 matrix
Create variable Hilb_Hy:
nccreate(filename,'Hilb_Hy','Dimensions',list('r',601,'c',601))
!--error 999
nccreate: nc_def_var() returned the error -42: NetCDF: String match to
name in use.
Do you have an example grid to test the read and write function.
Would it help to send you a copy of the grid file?
Thanks
On 5 February 2016 at 10:46, Harpreet Singh Rathore
<[email protected]> wrote:
Hey
You have not created the variable in the file. First you have to create a
variable in the following file using the command nccreate(filename,
'Hilb_Hy', 'Dimensions', list('r', no_row, 'c', no_column); after that you
can pass the ncwrite command and you have to pass like this
ncwrite(filename, 'Hilb_Hy',Hy) as Hy is a matrix.
Regards
Harpreet Singh
On Fri, Feb 5, 2016 at 4:01 PM, Lester Anderson <[email protected]>
wrote:
Hello Harpreet,
I altered the code a bit but still get a problem
Hy = hilbert(grav);
filename = fullfile('Q:\geophys\Gz_Hy.grd') // set output filename
// ncwrite(filename, varname, vardata, [start, [stride]])
ncwrite(filename, 'Hilb_Hy','Hy') // write variable Hilb_Hy with data from
Hy
Error message:
ncwrite(filename, 'Hilb_Hy','Hy') // write variable Hilb_Hy with data from
Hy
!--error 999
ncwrite: nc_inq_varid() returned the error -49: NetCDF: Variable not
found.
at line 6 of exec file called by :
exec('Q:\geophys\Lester\SCILAB_work\netcdf1.sce', -1)
In this case I want to define a variable name Hilb_Hy (although can
use any name really) in the netCDF file and write the output of the
Hilbert (Hy) transform.
Cannot see the solution
On 5 February 2016 at 10:15, Harpreet Singh Rathore
<[email protected]> wrote:
Dear Lester,
As I can see the error is saying minimum 3 inputs are required. And
after
going through the help of the following function, you also have to pass
the
value which you have to store in the 'Hy'. You can go through the help
files
of ncwrite by typing help ncwrite in the console.
Regards
Harpreet
On Fri, Feb 5, 2016 at 3:18 PM, Lester Anderson <[email protected]>
wrote:
Hello all
I am looking to use the sciNetCDF module to work with GMT grid files
but have some issues.
Reading a GMT grid is not a problem as far as I can tell, so the
following does read the file (and z variable), storing the values in
the grav array:
source = fullfile('Q:\geophys\Gz.grd')
grav = ncread(source,'z')
Hy = hilbert(grav); // write Hy variable to new file
I am having problems with writing out the processed data e.g write a
new grid (Gz_Hy.grd) with the Hilbert transform solution
filename = fullfile('Q:\geophys\Gz_Hy.grd')
ncwrite(filename, 'Hy') // does not work
Error return:
ncwrite(filename, 'Hy')
!--error 77
ncwrite: Wrong number of input argument(s): 3 to 5 expected.
at line 5 of exec file called by :
exec('Q:\geophys\Lester\SCILAB_work\netcdf1.sce', -1)
Any advice would be appreciated.
Thanks
Lester
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Thanks and Regards
Harpreet Singh
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Thanks and Regards
Harpreet Singh
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