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Re: Help needed with reading ASCII data [message #18140 is a reply to message #18131]

Fri, 03 December 1999 00:00

Bernard Puc
Messages: 65
Registered: January 1998

Member

Scott Reid wrote:
>
> Hi All
>
> I'm completely new to IDL, and I have a set of data in ASCII format. It
> is extracted from MRI data. It is a file which contains 3 columns of
> data. The first column is the x, the second is the y coordinate and the
> third is just a scaled magnitude value between 0 and 1. There are 38808
> rows of data, and the matrix size is (49, 36) and there are 22 time
> phases. I want to know if anyone has had experience in reading in data
> of this type, and how to put it into an array that can be read by IDL.

I typically do something like this when reading delimited ASCII data.
Each line is read into a string and then the string is divided into an
array of strings. Then you do what you will with the values in the
array:

OPENR,Lun,/Get_Lun,Filename
sString = ''
WHILE NOT(EOF(Lun)) DO BEGIN
READF,Lun,sString
tempArray = str_sep(sString, string(byte(32))) ;Replace with ASCII code
of delimiter
index = WHERE( tempArray NE '', num)
IF num GT 0 THEN tempArray = tempArray[index]

x = float(tempArray[0])
y = float(tempArray[1])
s = float(tempArray[2])
;You would assign these values to fill your array: fltarr(49,36,22)

END

--
Bernard Puc AETC, INC.
bpuc@va.aetc.com 1225 Jefferson Davis Highway #800
(703) 413-0500 Arlington, VA 22202

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[Message index]

		Re: Help needed with reading ASCII data By: Michael Asten on Fri, 03 December 1999 00:00
		Re: Help needed with reading ASCII data By: John Keck on Fri, 03 December 1999 00:00
		Re: Help needed with reading ASCII data By: Liam Gumley on Fri, 03 December 1999 00:00
		Re: Help needed with reading ASCII data By: Bernard Puc on Fri, 03 December 1999 00:00

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