| Re: How to plot multiple charts and ho to round float to specific precision? [message #44961 is a reply to message #44858] |
Thu, 28 July 2005 15:38   |
Benjamin Hornberger
Messages: 258
Registered: March 2004
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Senior Member |
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Paul Van Delst wrote:
> liko2@o2.pl wrote:
>
>> No, it has to be a value of variable, later used for a part of title of
>> a chart. So it has to be exact value with only 2 digits after zero.
>>
>
> Given your floating point variable,
>
> IDL> x=23.45654
> IDL> print, x
> 23.4565
>
> you can stick it into a string variable
>
> IDL> cx=string(x,format='(f15.2)')
> IDL> help, cx
> CX STRING = ' 23.46'
>
> Note I used the format f15.2 since you might have a number like
>
> IDL> y=7140264.38264
> IDL> cy=string(y,format='(f15.2)')
> IDL> help, cy
> CY STRING = ' 7140264.38'
>
> You'll want to leave enough room up front (via the "15" in f15.2) for
> the extra digits.
>
> And then you can crop the above results to your heart's content:
>
> IDL> help, strtrim(cx,2), strtrim(cy,2)
> <Expression> STRING = '23.46'
> <Expression> STRING = '140264.38'
>
> for your plot titles.
>
> paulv
>
Can't you just use a "0" in the format string ('(f0.2)') instead of
using a large number first and then trimming the string?
Benjamin
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