Hello There Again
Might be a silly question but it has played me for the last two days!
I have a string 'mystring' (pasted below), what i want to do is to change
the values of of NAXIS1 (=1024) and NAXIS2 (=2048) to some other values!
say NAXIS1 = 999 and NAXIS2 = 888.
These old values that i want to change are not know forehand so i can not
use
>>> string.replace(1024, 999) #
i also have tried
>>> re.sub(r'(\d{4})', ' '+str(999), mystring)
but this changes all occurrences of any 4 digit number in the string and
also sets both NAXIS1 and NAXIS2 to the same value!
i also tried
>>> naxis = re.findall(r'(\d{4})',mystring[:360])
>>> mystring.replace(naxis[0], ' '+str(999))
>>> mystring.replace(naxis[1],' '+str(888)) # the empty quotes are to keep
the len(mystring) the same before and after replacement
i am sure there must be a better ways to do it
Any ideas, i appreciate!
Cheers
Johnson
-----------------------------------------
mystring = "SIMPLE = T / Fits format BITPIX
= -32 / bits per pixel NAXIS
= 2 / single image
NAXIS1 = 1024 / x size
NAXIS2 = 2048 / y
size AIRMEND = 1.516
/ no comment AIRMSTRT=
1.516 / no comment DATE =
'2005-01-15T12:32:00' / no comment
DATE-OBS= '2005-01-15T12:26:00' / no
comment EXPTIME = 360.0 /
no comment OBJECT = 'herculesfield9
' / no comment INSTRUME=
'MDM8K ' / no comment
TELESCOP= 'MDM 2.4m ' / no
comment TEL_LAT = 31.95 /
no comment TEL_LONG=
-111.6167 / no comment
TEL_ELEV= 1938.5 / no
comment TEL_ZONE= 7.0 /
no comment CHIP_ID =
2 / no comment FILT_ID =
'R ' / no comment
CTYPE1 = 'RA---TAN ' / no
comment CRVAL1 = 241.320458333 /
no comment CRPIX1 =
-127.0 / no comment CTYPE2 =
'DEC--TAN ' / no comment
CRVAL2 = 16.7331388889 / no
comment CRPIX2 = 1525.0 /
no comment CD1_1 =
0.0 / no comment CD1_2 =
-9.61111111111e-05 / no comment CD2_1
= 9.61111111111e-05 / no comment
CD2_2 = 0.0 / no
comment STATMIN = 3179.140625 /
no comment STATMAX =
3760.86035156 / no comment
STATMEAN= 3473.74743563 / no
comment STATDEV = 56.3806567048 /
no comment STATMED =
3469.74121094 / no comment DATAMD5 =
'c8f7fd1759dcc82a42347e8e7eaf51db' / MD5 checksum END "
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