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Re: Converting Doubles to Strings [message #46153 is a reply to message #46149]

Mon, 07 November 2005 11:53

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

David Fanning wrote:

> Folks,
>
> I've run into an interesting problem. I have a double precision
> number that I wish to convert to a string (so I can put it into
> a text widget, for example). I don't know ahead of time how many
> significant digits will be in this number. The number could
> look like this 45.6, or this 123456789.123456789, or this
> -22.1234567890. If it looks like the latter number, I am
> having a very hard time converting it to a string. For example,
> this doesn't work:
>
> IDL> v = String(-22.1234567890, Format='(D0)')
> IDL> Print, v
> -22.123457
>

David
the sky is falling down

Why do you think thats 22.1234567890 is of type double. This is float!

Probably it's only a type mismatch in this example here.

I prefer the 'G' format

IDL> print, String(-22.1234567890D, Format='(G)')
-22.12345678900000

instead of
IDL> print, String(-22.1234567890D, Format='(D)')
-22.1234567889999987

cheers
Reimar

> Is this a bug in IDL? Or am I overlooking something?
>
> Cheers,
>
> David

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[Message index]

		Re: Converting Doubles to Strings By: biophys on Mon, 07 November 2005 14:39
		Re: Converting Doubles to Strings By: biophys on Mon, 07 November 2005 14:17
		Re: Converting Doubles to Strings By: R.Bauer on Mon, 07 November 2005 11:53
		Re: Converting Doubles to Strings By: biophys on Sat, 05 November 2005 19:20
		Re: Converting Doubles to Strings By: biophys on Sat, 05 November 2005 17:01
		Re: Converting Doubles to Strings By: Craig Markwardt on Sat, 05 November 2005 07:31
		Re: Converting Doubles to Strings By: biophys on Sat, 05 November 2005 02:40
		Re: Converting Doubles to Strings By: Andrew Cool on Sat, 05 November 2005 01:46
		Re: Converting Doubles to Strings By: R.Bauer on Mon, 07 November 2005 22:42

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