How to use debugging tools

[Colin Ingram]

I have problems using the debugging tools (dbstop, dbg_next etc)

octave:1> debug_on_warning = 1
debug_on_warning = 1
octave:2> tiffread("2005.08.24-12-1-4.tiff")
warning: in /share/colin/Work/programs/frapfitter/trunk/lib/tiffread.m 
near line 137, column 9:
warning: tiffread:assignIFDentry: some elements in list of return values 
are undefined
keyboard: stopped in 
/share/colin/Work/programs/frapfitter/trunk/lib/tiffread.m at line 137
debug> dbwhere
error: dbwhere: must be inside of a user function to use dbwhere
debug> dbstop("tiffread.m","142")
error: dbstop: unable to find the function requested
debug> dbstop("tiffread","142")
panic: Segmentation fault -- stopping myself...
attempting to save variables to `octave-core'...
error: octave_base_value::save_binary(): wrong type argument `file'
save to `octave-core' complete
Segmentation fault
address@hidden:~/frapfitter/trunk/lib$


How are these tools supposed to be used?



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