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extract numbers from string [message #44518]

Tue, 21 June 2005 13:59

Tobi
Messages: 2
Registered: June 2005

Junior Member

i have a data file with a header that has several lines, which i read
with

readf,1,firstline
readf,1,secondline
....

firstline is a string that looks like
xpixels = 1024

i am trying to convert this to a variable called nx which has the value
1024.

is there a clean and easy way to do this?

Thanks!

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Re: extract numbers from string [message #44577 is a reply to message #44518]

Thu, 23 June 2005 01:30

enod
Messages: 41
Registered: November 2004

Member

Why not use '=' as the seperator?

Tian.

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Re: extract numbers from string [message #44582 is a reply to message #44518]

Wed, 22 June 2005 05:18

Haje Korth
Messages: 651
Registered: May 1997

Senior Member

Try this: nx=long(strmid(firstline,10,4)). You may have to adjust the
position and length (10 & 4) depending on your range of variables.

"Tobi" <tbeetz@yahoo.com> wrote in message
news:1119387544.336298.199520@f14g2000cwb.googlegroups.com.. .
> i have a data file with a header that has several lines, which i read
> with
>
> readf,1,firstline
> readf,1,secondline
> ....
>
> firstline is a string that looks like
> xpixels = 1024
>
> i am trying to convert this to a variable called nx which has the value
> 1024.
>
> is there a clean and easy way to do this?
>
> Thanks!
>

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Re: extract numbers from string [message #44585 is a reply to message #44518]

Wed, 22 June 2005 07:27

Norbert Hahn
Messages: 46
Registered: May 2003

Member

"Tobi" <tbeetz@yahoo.com> wrote:

> i have a data file with a header that has several lines, which i read
> with
>
> readf,1,firstline
> readf,1,secondline
> ....
>
> firstline is a string that looks like
> xpixels = 1024
>
> i am trying to convert this to a variable called nx which has the value
> 1024.
>
> is there a clean and easy way to do this?

I would use

reads, firstline, nx, format="(9X,I5)"

The format statment cause reads to skip 9 characters and then expect up to 5
digits for an integer number.

HTH
Norbert

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Re: extract numbers from string [message #44586 is a reply to message #44518]

Wed, 22 June 2005 05:55

Ken Mankoff
Messages: 158
Registered: February 2000

Senior Member

On Tue, 21 Jun 2005, Tobi wrote:
> i have a data file with a header that has several lines, which i read
> with
>
> readf,1,firstline
> readf,1,secondline
> ....
>
> firstline is a string that looks like
> xpixels = 1024
>
> i am trying to convert this to a variable called nx which has the
> value 1024.
>
> is there a clean and easy way to do this?

success = execute( firstline )
success = execute( secondline )

-k.

--
http://spacebit.dyndns.org/

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Re: extract numbers from string [message #44587 is a reply to message #44586]

Wed, 22 June 2005 07:10

Haje Korth
Messages: 651
Registered: May 1997

Senior Member

Pretty clever, I guess I am one of the only IDL programmers out here that is
not using the execute function.

Haje

"Ken Mankoff" <mankoff@gmail.com> wrote in message
news:Pine.OSX.4.61.0506220854490.440@gouda.localhost...
>
> On Tue, 21 Jun 2005, Tobi wrote:
>> i have a data file with a header that has several lines, which i read
>> with
>>
>> readf,1,firstline
>> readf,1,secondline
>> ....
>>
>> firstline is a string that looks like
>> xpixels = 1024
>>
>> i am trying to convert this to a variable called nx which has the value
>> 1024.
>>
>> is there a clean and easy way to do this?
>
> success = execute( firstline )
> success = execute( secondline )
>
> -k.
>
> --
> http://spacebit.dyndns.org/
>

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Re: extract numbers from string [message #44600 is a reply to message #44587]

Tue, 05 July 2005 13:19

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

Haje Korth wrote:

> Pretty clever, I guess I am one of the only IDL programmers out here that
> is not using the execute function.
>
> Haje
>

No, I am too :-)

Btw. for this it is not necessary to use execute.
You could do this by SCOPE_VARFETCH and this one runs in vm too.

cheers

Reimar

> "Ken Mankoff" <mankoff@gmail.com> wrote in message
> news:Pine.OSX.4.61.0506220854490.440@gouda.localhost...
>>
>> On Tue, 21 Jun 2005, Tobi wrote:
>>> i have a data file with a header that has several lines, which i read
>>> with
>>>
>>> readf,1,firstline
>>> readf,1,secondline
>>> ....
>>>
>>> firstline is a string that looks like
>>> xpixels = 1024
>>>
>>> i am trying to convert this to a variable called nx which has the value
>>> 1024.
>>>
>>> is there a clean and easy way to do this?
>>
>> success = execute( firstline )
>> success = execute( secondline )
>>
>> -k.
>>
>> --
>> http://spacebit.dyndns.org/
>>

--
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
http://www.fz-juelich.de/icg/icg-i/
============================================================ ======
a IDL library at ForschungsZentrum Juelich
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_lib_intro. html

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