Re: [netcdfgroup] Type conversion when writing netCDF

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• Subject: Re: [netcdfgroup] Type conversion when writing netCDF
• From: Jennifer Adams <jma@xxxxxxxxxxxxx>
• Date: Mon, 29 Nov 2010 09:46:51 -0500

--Jennifer


On Nov 29, 2010, at 9:32 AM, Jim Edwards wrote:

As long as your netcdf file defines the variable as float, you can skip steps 1 and 2 and call nc_put_vara_double() and netcdf will do the conversion internally.

On Mon, Nov 29, 2010 at 7:29 AM, Jennifer Adams <jma@xxxxxxxxxxxxx> wrote:

Dear Experts,

It says in the documentation, "...if you write a program that deals with all numeric data as double-precision floating point values, you can read netCDF data into double-precision arrays without knowing or caring what the external type of the netCDF variables are." This is very handy, and I wonder if there is any way to use this kind of easy type conversion when writing out data.

When my program that deals with all numeric data as double-precision needs to write out floating point values, I use this algorithm: 1. allocate a new array of floats equal in size to the array of doubles 2. loop over elements in the arrays and explicitly cast the data values from double to float

3. call nc_put_vara_float() to write the floats to the output file

Is there a way to do this that would not require the memory allocation in step 1?

--Jennifer

--
Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Calverton, MD 20705
jma@xxxxxxxxxxxxx




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