matlab.io.fits.getHdrSpace
Get number of keywords in header
Syntax
[nkeys,morekeys] = fits.getHdrSpace(fptr)
Description
[nkeys,morekeys] = fits.getHdrSpace(fptr)
returns
the number of existing keywords (not counting the END keyword) and
the amount of space currently available for more keywords. It returns morekeys
= -1
if the header has not yet been closed. Note that the
CFITSIO library will dynamically add space if required when writing
new keywords to a header so in practice there is no limit to the number
of keywords that can be added to a header.
This function corresponds to the fits_get_hdrspace
(ffghsp)
function in the CFITSIO library C API.
Examples
import matlab.io.* fptr = fits.openFile('tst0012.fits'); [nkeys,morekeys] = fits.getHdrSpace(fptr); fits.closeFile(fptr);