| Re: READ_ASCII truncating data [message #88013 is a reply to message #88012] |
Wed, 12 March 2014 06:02  |
David Fanning
Messages: 11724
Registered: August 2001
|
Senior Member |
|
|
Simon Mitchell writes:
> I have an issue with READ_ASCII truncating data (IDL 8,01 Win7 64bit).
> I am sure it is something to do with regional settings, the decimal place is set to "," instead of "."
>
> The file that I am reading is space delimeter (HEX char 20) and my READ_ASCII statement reflects this (ie is default for the delimeter)
>
> red_data = READ_ASCII(redfile, DATA_START = 6, COUNT = nl)
>
> An example of the data from the input file is:
> 0,4571 1334,62 9,356
>
> But when looking at the array after reading, the values are
> 0,0 1334,0 9,0
>
> The same issue occurs if I include DELIMETER=string(20)
>
>
> I do know that if I change the win7 regional settings to have the decimal place "." the data is read correctly without truncating.
> But I do not want to change the settings as I have other software which does not work if it is changed.
> Also, if the input file is changed to replace the "," with "." then the file is read correctly.
>
> Would anyone have any idea as to why the READ_ASCII is behaving this way and have a solution?
> Is it a mistake that I have made in the code, or is there some settings that need to be changed in IDL?
> I cannot find any reference to this problem anywhere and there is nothing on regionalizing decimal place characters that I can find.
You can simply open READ_ASCII up and have a look at why it is behaving
like this. I find this bit of code near the top of the file and without
investigating too thoroughly imagine this would be a good place to
start:
; If there are no strings in the line, just split on
; commas and return.
if (ARRAY_EQUAL(isQuote, 0b)) then begin
return, STRTOK(lineIn, STRING(44b), /EXTRACT, /PRESERVE_NULL)
endif
I think if it were me, I would just write a short routine to read this
file myself, line by line, as READ_ASCII does, but I would do the
substitutions of commas for decimal points myself with Mike Galloy's
wonderful routine STR_REPLACE (found in the public folder of the Coyote
Library because of its usefulness):
IDL> line = '123,4 18,456'
IDL> modified_line = str_replace(a, ',', '.', /Global)
IDL> print, modified_line
123.4 18.456
IDL> data = fltarr(2)
IDL> reads, modified_line, data
IDL> print, data
123.400 18.4560
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
