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Re: significant figures function? [message #23891 is a reply to message #23889]

Mon, 26 February 2001 16:07

Martin Downing
Messages: 136
Registered: September 1998

Senior Member

"Med Bennett" <mbennett@indra.com> wrote in message
news:3A9ACD30.E0F3F5D9@indra.com...
> Has anyone written a function that returns the input value or array with
> a specified number of significant digits? I have lloked at the various
> IDL libraries on the web but did not come up with what I'm after.
> Thanks in advance for any pointers -
>

this should do it

function fix_digits, num, digits
expon = 1.0
while num/expon gt 1 do expon = expon * 10
fix_val = num/expon
fstring = string(digits+2, digits, format = '("(f",i0.0,".",i0.0,")")')
reads, string(fix_val, format = fstring), fix_val
return, fix_val * expon
end

> print, fix_digits(!pi, 3)
3.14000

Martin

----------------------------------------
Mr. Martin Downing,
Clinical Research Physicist,
Orthopaedic RSA Research Centre,
Woodend Hospital,
Aberdeen, AB15 6LS.
m.downing@abdn.ac.uk

Martin

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[Message index]

		Re: significant figures function? By: Med Bennett on Mon, 26 February 2001 18:33
		Re: significant figures function? By: Martin Downing on Mon, 26 February 2001 17:36
		Re: significant figures function? By: Ben Tupper on Mon, 26 February 2001 15:44
		Re: significant figures function? By: Martin Downing on Mon, 26 February 2001 16:07

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