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Re: number format in structure [message #45671 is a reply to message #45670]

Sun, 25 September 2005 19:51

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

kl_tah@hotmail.com writes:
> Hi All,
>
> does anyone happen to know how I can specify the format to which
> numbers stored in structure tags should adhere?
>
> for example, I'd like to (hypothetically) be able to do
>
> s={a:3.2f,b=2.3f}
>
> s.a=123.12345678
>
> will yield
>
> print,s.a
> 123.12

You could store the format in the structure, as in,
s = {a:0., a_format: '3.2F', $
b:0., b_format: '5.3F' }
and
print, s.a, format=s.a_format

This is still not easy if you want to make a compound print statement
with many fields.

Also, beware that a single precision floating point number can't store
the 11 significant figures of the number you entered. You would have
to use double precision (single = 6-7 decimal digits; double = 17
decimal digits).

Good luck,
Craig

--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@REMOVEcow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Re: number format in structure By: R.G. Stockwell on Mon, 26 September 2005 11:34
		Re: number format in structure By: Koh Leong Tah on Mon, 26 September 2005 11:10
		Re: number format in structure By: Paolo Grigis on Mon, 26 September 2005 05:04
		Re: number format in structure By: peter.albert@gmx.de on Mon, 26 September 2005 03:07
		Re: number format in structure By: Koh Leong Tah on Sun, 25 September 2005 22:06
		Re: number format in structure By: Craig Markwardt on Sun, 25 September 2005 19:51
		Re: number format in structure By: David Fanning on Sun, 25 September 2005 19:01

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