| Reading formatted input with READS [message #93596] |
Wed, 31 August 2016 20:27  |
Stefano Garcia
Messages: 2
Registered: August 2016
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Junior Member |
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Hello everybody,
This is my first post so please let me know if I posted it in the wrong place.
My problem is purely that I am not yet familiarized with the IDL formats. I would like to use READS to read what is in between the square brackets below:
%M.z 20.37 [~] D 2011A&A...527A..78F
%M.z 20.37 [0.12] D 2011A&A...527A..78F
So, there is two cases, one when it is a STRING and the other, when it is a FLOAT.
Is there a way to read that?
I will appreciate any help.
Thanks
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| Re: Reading formatted input with READS [message #93597 is a reply to message #93596] |
Thu, 01 September 2016 01:50  |
Helder Marchetto
Messages: 520
Registered: November 2011
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Senior Member |
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On Thursday, September 1, 2016 at 5:27:19 AM UTC+2, Stefano Garcia wrote:
> Hello everybody,
>
> This is my first post so please let me know if I posted it in the wrong place.
>
> My problem is purely that I am not yet familiarized with the IDL formats. I would like to use READS to read what is in between the square brackets below:
>
> %M.z 20.37 [~] D 2011A&A...527A..78F
> %M.z 20.37 [0.12] D 2011A&A...527A..78F
>
> So, there is two cases, one when it is a STRING and the other, when it is a FLOAT.
>
> Is there a way to read that?
>
> I will appreciate any help.
>
> Thanks
Hi,
dunno how to use reads, but I do these sort of stuff with string functions. Not as elegant, but works. To check if the string between square brackets is a number or not, I use the isnumber() from Johns Hopkins University/Applied Physics Laboratory. You don't need the whole library. You can find it here: http://fermi.jhuapl.edu/s1r/idl/s1rlib/local_idl.html
IDL> str = '%M.z 20.37 [~] D 2011A&A...527A..78F'
IDL> posStart = strpos(str, '[')+1
IDL> posEnd = strpos(str, ']')
IDL> print, strmid(str, posStart, posEnd-posStart)
~
IDL> print, isnumber(strmid(str, posStart, posEnd-posStart), value) gt 0
0
IDL>
IDL> str = '%M.z 20.37 [0.12] D 2011A&A...527A..78F'
IDL> posStart = strpos(str, '[')+1
IDL> posEnd = strpos(str, ']')
IDL> print, strmid(str, posStart, posEnd-posStart)
0.12
IDL> print, isnumber(strmid(str, posStart, posEnd-posStart), value) gt 0
I hope it helps.
Cheers,
Helder
PS: this is the right place for these questions
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| Re: Reading formatted input with READS [message #93598 is a reply to message #93596] |
Thu, 01 September 2016 01:55 |
Markus Schmassmann
Messages: 129
Registered: April 2016
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Senior Member |
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On 09/01/2016 05:27 AM, Stefano Garcia wrote:
> This is my first post so please let me know if I posted it in the
> wrong place.
>
> My problem is purely that I am not yet familiarized with the IDL
> formats. I would like to use READS to read what is in between the
> square brackets below:
>
> %M.z 20.37 [~] D 2011A&A...527A..78F
> %M.z 20.37 [0.12] D 2011A&A...527A..78F
>
> So, there is two cases, one when it is a STRING and the other, when
> it is a FLOAT.
>
> Is there a way to read that?
Hallo Stefano, welcome
one way to read the string is the following:
str=strMid(string,strPos(string,'[')+1,strPos(string,']')-st rPos(string,'[')-1)
fltRegEx='^[-+]?(([0-9]*\.?[0-9]+([ed][-+]?[0-9]+)?)|(inf)|( nan))$'
isFloat=stRegEx(str,fltRegEx,/boolean,/fold_case)
if isFloat then out=float(str) else out=str
if you want to do it with READS, you should first figure out which terms
in your table have a fixed with, this will simplify considerably coming
up with a correct format code. For details on these, see:
http://www.harrisgeospatial.com/docs/format_codes.html
Markus
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| Re: Reading formatted input with READS [message #93602 is a reply to message #93598] |
Thu, 01 September 2016 07:15 |
Markus Schmassmann
Messages: 129
Registered: April 2016
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Senior Member |
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On 09/01/2016 10:55 AM, Markus Schmassmann wrote:
> On 09/01/2016 05:27 AM, Stefano Garcia wrote:
>> This is my first post so please let me know if I posted it in the
>> wrong place.
>>
>> My problem is purely that I am not yet familiarized with the IDL
>> formats. I would like to use READS to read what is in between the
>> square brackets below:
>>
>> %M.z 20.37 [~] D 2011A&A...527A..78F
>> %M.z 20.37 [0.12] D 2011A&A...527A..78F
>>
>> So, there is two cases, one when it is a STRING and the other, when
>> it is a FLOAT.
>>
>> Is there a way to read that?
> one way to read the string is the following:
>
> str=strMid(string,strPos(string,'[')+1,strPos(string,']')-st rPos(string,'[')-1)
>
> fltRegEx='^[-+]?(([0-9]*\.?[0-9]+([ed][-+]?[0-9]+)?)|(inf)|( nan))$'
> isFloat=stRegEx(str,fltRegEx,/boolean,/fold_case)
> if isFloat then out=float(str) else out=str
>
> if you want to do it with READS, you should first figure out which terms
> in your table have a fixed with, this will simplify considerably coming
> up with a correct format code. For details on these, see:
>
> http://www.harrisgeospatial.com/docs/format_codes.html
made an error with the regex, hope this one is correct now:
fltRegEx='^[-+]?(((([0-9]*\.?[0-9]+)|([0-9]+\.))([ed]([-+]?[ 0-9]+)?)?)|(inf)|(nan))$'
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| Re: Reading formatted input with READS [message #93603 is a reply to message #93596] |
Thu, 01 September 2016 14:12 |
Stefano Garcia
Messages: 2
Registered: August 2016
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Junior Member |
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This is indeed a very useful place.
Helder, thanks for the ISNUMBER functions like. I do not have yet the library you mentioned but I found something similar in the IDL Astronomy Users Library that I already have.
Markus, thanks for the usage of regular expresions, it was educative. Indeed, that was the original direction of my question.
Finally, I will do as follow
str = strsplit(str, "[]", /Extract)
str = str[1]
And then to check with one of those ISNUMBER functions like.
Thanks again.
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