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Re: Change structure tags from float to double [message #67204]

Wed, 08 July 2009 08:30

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

Anthony schrieb:
> Hi again,
>
> David - I'm reading data using MRDFITS - not sure I can convert the
> data when reading it in??
>
> Reimar - does it work on arrays of structures? I tried this:

not directly but you can call reform_struct beforehand
http://www.fz-juelich.de/icg/icg-1/idl_icglib/idl_source/idl _html/dbase/reform_struct_dbase.pro.html
and afterwards

wget
http://www.fz-juelich.de/icg/icg-1/idl_icglib/idl_source/idl _html/dbase/download/reform_struct.sav

IDL> x2 = reform_struct(x,5,/tag)
IDL> help,x2
X2 STRUCT = -> <Anonymous> Array[1]

y = replace_tagvalue(x2, 'A', double(x.a))

x = reform_struct(y,5,/str)
IDL> help ,x
X STRUCT = -> <Anonymous> Array[5]
IDL> help ,x,/str
** Structure <1dc3b78>, 2 tags, length=16, data length=10, refs=1:
A DOUBLE 0.0000000
B INT 0

cheers
Reimar

>
> IDL> x = replicate({a:0., b:0}, 5)
> IDL> help, x
> X STRUCT = -> <Anonymous> Array[5]
> IDL> help, x, /struct
> ** Structure <15ee908>, 2 tags, length=8, data length=8, refs=1:
> A FLOAT 0.00000
> B LONG 0
> IDL> y = replace_tagvalue(x, 'A', double(x.a))
> IDL> help, y
> Y STRUCT = -> <Anonymous> Array[1]
> IDL> help, y, /struct
> ** Structure <15f5518>, 2 tags, length=64, data length=60, refs=1:
> A DOUBLE Array[5]
> B LONG Array[5]
>
> ... but it completely changed the structure.
>
> Maybe I'll just edit the FITS file manually...
>
> Anthony

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[Message index]

		Re: Change structure tags from float to double By: R.Bauer on Wed, 08 July 2009 08:30
		Re: Change structure tags from float to double By: Anthony[1] on Wed, 08 July 2009 08:04
		Re: Change structure tags from float to double By: David Fanning on Wed, 08 July 2009 07:43
		Re: Change structure tags from float to double By: Anthony[1] on Wed, 08 July 2009 07:38
		Re: Change structure tags from float to double By: Anthony[1] on Wed, 08 July 2009 07:23
		Re: Change structure tags from float to double By: R.Bauer on Wed, 08 July 2009 06:40
		Re: Change structure tags from float to double By: David Fanning on Wed, 08 July 2009 05:44

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