Re: 1) CD-ROMs

[hankin@xxxxxxxxxxxxxxxxxxx (Steve Hankin)]

Hi Rodrigo,

1) Regarding the difficulties that you reported reading of CD-ROM files on
Linux: We have seen a similar problem reading CD-ROM files on DEC Unix
machines. In that case we tracked it as far as to determine that there was a
bug in DEC FORTRAN -- the FORTRAN OPEN statement didn't recognize the CD-ROM
file.

If you can work around the problem by mounting the CD-ROM in RW mode (whatever
that implies on a read-only device??), that sounds like an easy fix, no?

2) Regarding the labels on polar stereographic plots: The next version of
Ferret (already running in our shop) has a vastly simplified approach to map
projections that will handle labling correctly. Meantime, Mark Verschell's
suggestion of customizing the polar plotting script is the best route to take.

	Happy Ferreting - steve

===========================================================

On Sep 4,  9:01pm, Rodrigo Caballero Augi wrote:
> Subject: Re: 1) CD-ROMs
> On Thu, 4 Sep 1997, Mark A. Verschell wrote:
>
> > On Sep 3, 11:51pm, Rodrigo Caballero Augi wrote:
> > > 1) Can Ferret read data directly from a CD-ROM? (I've tried it in the
> > > straightforward way, but the instruction 'use data_file' always produces
> > > the message 'data_file not existent or not on line' even though the CD is
> > > correctly mounted)
> >
> > If you are including directory or device names you need to enclose the name
in
> > double quotes. E.g.:
> > yes? use "/dev/cd/mydata"
>
> I mount my CD with the instruction
>
> mount -t iso9660 /dev/scd0 /mnt/cdrom
>
> I then start a ferret session, and the following happens:
>
> yes? spawn ls /mnt/cdrom/
> gph300mb_winter80  gph300mb_winter81  gph300mb_winter82  gph300mb_winter83
> yes? file "/mnt/cdrom/gph300mb_winter80"
>  **TMAP ERR: non-existent or not on line
>              /mnt/cdrom/gph300mb_winter80
>
> i.e., it seems ferret cannot see the file even though the operating system
> (which is Linux 2.0.30 on an i686) can. I think this may be due to the
> fact that CD-ROMs are mounted read-only. In fact, I've tried the following
> experiment:  I mounted a floppy disk in rw mode, accessed a file on
> it from ferret, and succeeded; I then unmounted it, remounted it with the
> ro option, tried to access the same file, and failed (with the same
> message as above). Any ideas?
>
> Rodrigo
>
>
> ---
>
>  Rodrigo Caballero Augi |Geophysics Department    |phone: +45 35 32 05 64
> 		        |NBIfAFG		  |fax:       35 36 53 57
>  		        |University of Copenhagen |home:      31 23 05 80
> 		        |Juliane Maries Vej 30    |e-mail:  rca@gfy.ku.dk
> 		        |DK-2100 Copenhagen O     |http://www.gfy.ku.dk/~rca
> 			|Denmark
>
>-- End of excerpt from Rodrigo Caballero Augi




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