Routines (alphabetical) > Routines: H > HDF Routines > HDF_VD_FEXIST

# HDF_VD_FEXIST

The HDF_VD_FEXIST function determines whether the specified fields exist in the given HDF file.

## Syntax

Result = HDF_VD_FEXIST(VData, Fieldnames)

## Return Value

Returns 1 (True) if all the specified fields exist.

## Arguments

### VData

The VData handle returned by a previous call to HDF_VD_ATTACH.

### Fieldnames

A string containing a comma-separated list of fields to test. For example, 'VEL' or 'PZ,PY,PX'.

## Keywords

None

## Version History

4.0 | Introduced