| number format in structure [message #45673] |
Sun, 25 September 2005 18:16  |
Koh Leong Tah
Messages: 11
Registered: May 2005
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Junior Member |
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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
Any ideas?
Thanks,
KL
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| Re: Number format [message #72443 is a reply to message #45673] |
Sat, 11 September 2010 02:45  |
Wout De Nolf
Messages: 194
Registered: October 2008
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Senior Member |
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On Fri, 10 Sep 2010 20:43:57 -0700 (PDT), mahesh <mkmvarma@gmail.com>
wrote:
> How do I change the format of numbers. For example : from '9.5600' to
> '9.56E+00'. I need to write the numbers in this format into a text
> file. I know there is 'FORMAT' function in IDL. I tried using it right
> after the printf statement. But it is not converting it to the format
> I wanted.
> Thanks,
> Mahesh
IDL> print,9.56,format='(E10.2)'
9.56E+000
This means: scientific notation, 2 digits after the decimal point and
a string length of 10 characters. Make sure this string length is
large enough (depends on the numbers you're printing). On a windows
platform, the exponent has 3 digits, on Linux it has 2. I don't think
you can change that (off course you can manipulate the string itself
before printing it).
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