| Re: How to plot multiple charts and ho to round float to specific precision? [message #44959 is a reply to message #44858] |
Thu, 28 July 2005 15:45   |
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Paul Van Delst[1]
Messages: 1157
Registered: April 2002
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Senior Member |
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Benjamin Hornberger wrote:
> 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?
I tried that first (based on your original post) but it didn't work for me.
IDL> print, !version
{ x86 linux unix linux 6.0.3 Feb 26 2004 32 64}
IDL> x=23.45654
IDL> cx=string(x,format='(f0.2)')
IDL> help, cx
CX STRING = '23.456539'
IDL> y=7140264.38264
IDL> cy=string(y,format='(f0.2)')
IDL> help, cy
CY STRING = '7140264.500000'
Dunno why not.
paulv
--
Paul van Delst
CIMSS @ NOAA/NCEP/EMC
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