| Re: using an unlnown number of keywords [message #27379] |
Mon, 22 October 2001 13:32  |
John-David T. Smith
Messages: 384
Registered: January 2000
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Senior Member |
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Sean Raffuse wrote:
>
> Liam E. Gumley <Liam.Gumley@ssec.wisc.edu> wrote in message
> news:3BD469CE.7B6483C6@ssec.wisc.edu...
>> Sean Raffuse wrote:
>>>
>>> David Fanning <david@dfanning.com> wrote in message
>>> news:MPG.163a5b3f51d8f2ea989719@news.frii.com...
>>>> Sean Raffuse (sean@me.wustl.edu) writes:
>>>>
>>>> > I'm trying to write a more or less universal procedure that takes a
> data
>>>> > structure and prints the variables out one by one one a line in an
> ascii
>>>> > file. The problem is that the structure could have any number of
>>> variables.
>>>> > I want to do this:
>>>> >
>>>> > printf, lun, structure.var1, structure.var2, structure.var3, . . .,
>>>> > structure.varN
>>>> >
>>>> > If I know N, is there a way to do this without resorting to N cases?
>>>>
>>>> How about something like this:
>>>>
>>>> numTags = N_Tags(structure)
>>>> PrintF, lun, structure, Format='(' + StrTrim(numTags,2) + 'F10.2)'
>>>>
>>> This would work fine if I didn't have different data types. Strings (of
>>> various lengths) may be mixed with floats and integers. Any other ideas
> out
>>> there in IDL expert land??
>>
>> Why not use default formatting? For example:
>>
>> IDL> a = {var1:indgen(30), var2:['a', 'b', 'c'], var3:findgen(9)}
>> IDL> print, a
>> { 0 1 2 3 4 5 6 7
>> 8 9 10 11 12 13 14 15
>> 16 17 18 19 20 21 22 23
>> 24 25 26 27 28 29
>> a b c
>> 0.00000 1.00000 2.00000 3.00000 4.00000
>> 5.00000 6.00000 7.00000 8.00000
>> }
>>
>> Each variable starts on a new line in the printed output.
>
> The problem is that I am trying to format the data into columns:
>
> var1 var2 var3 . . . varN
> var1 var2 var3 . . . varN
> var1 var2 var3 . . . varN
> var1 var2 var3 . . . varN
>
Hmm:
s=string(FORMAT='(A)',a)
print,s,FORMAT='('+strtrim(n_elements(s),2)+'(A,2X))'
but of course you won't be able to recover the existing structure this
way. I.e. you won't know "var2" is a three element vector.
JD
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