Structure problem

[Ben Sapp]

Hi,

I am using octave 2.1.52 on Windows and something that worked in 2.1.50 is 
failing now.   I wrote an oct file that loads Ortec's chn file format into 
a structure in octave. (Chn files hold gamma ray spectrum.)  I create an 
Octave_map called map and then set many elements like this: (C++ code)

  map["seconds"] = octave_value(str.append(chead.seconds, 2));

I do this many times for all elements in the C structure chead.  I then 
create an octave_value that I return like this "retval = 
octave_value(map);"  A loadchn followed by a whos reveals the following:

octave:78> Ra = loadchn(fName);
octave:79> whos Ra

*** local user variables:

prot  type                       rows   cols  name
====  ====                       ====   ====  ====
 rwd  struct                        0      0  Ra

Notice the 0, 0 for rows and cols where as if I create a structure on the 
octave command line it has 1,1.  Afterwards, I want to be able to add an 
element called fName to the structure Ra but this fails as follows:

 octave:80> Ra.fName = fName
error: invalid structure assignment
error: assignment to structure element failed
error: assignment failed, or no method for `struct = string'
error: evaluating assignment expression near line 80, column 10

Do you have any idea why this is failing?  What is the correct way to 
create a structure in an oct file?

Thanks,
Ben.

P.S.  If I create a structure on the command line I can successfully 
perform the fName assignment mentioned above.

Ben Sapp                                     Los Alamos National Laboratory
email: <mailto:address@hidden>   Phone: (505)667-8004
Fax:   (505)665-3657



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