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Re: problem string from double missing digits [message #36404 is a reply to message #36403]

Thu, 11 September 2003 06:10

James Kuyper
Messages: 425
Registered: March 2000

Senior Member

Reimar Bauer wrote:
>
> Hi all,
>
> did someone know what here is going on.
>
> IDL> d = 98046763.617D
> IDL> s = string(d)
> IDL> PRINT,s
> 98046764.
> IDL> HELP,s
> S STRING = ' 98046764.'
>
> Where are the digits ????
...
> Or does it mean I have first to determine the Format of the number and I
> have to use this information to get the right number.

If you don't like the default format, you do have to specify the
particular alternative you wish to use. However, you don't have to be
explicit:

IDL> PRINT,string(d,FORMAT='(F)')
98046763.6169999990000000

That's overkill, but at least you didn't lose anything. Coming from a C
background, I personally prefer:

IDL> PRINT,string(d,FORMAT='(%"%f")')
98046763.617000

...
> This goes right. But my feeling is this is terrible. Because I bet noone
> takes care on this. What's your feeling?

My feeling is that you'd lose your bet. Almost everyone who spends much
time printing floating point numbers ends up sooner or later having to
override the default formats.

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[Message index]

		Re: problem string from double missing digits By: R.Bauer on Thu, 11 September 2003 06:35
		Re: problem string from double missing digits By: K. Bowman on Thu, 11 September 2003 06:24
		Re: problem string from double missing digits By: James Kuyper on Thu, 11 September 2003 06:10
		Re: problem string from double missing digits By: Craig Markwardt on Thu, 11 September 2003 06:12

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