changing oct-files to be ready for 3.4

[Carlo de Falco]

Hi all,

Some time ago I sent this post which remained unanswered:
"http://octave.1599824.n4.nabble.com/Octave-packages-for-IsoGeometric-analysis-and-moving-to-3-4-tp3091510p3091510.html";

Probably the question was not specific enough, so I'll try again reducing the 
problem to a minimal function that 
shows the same issue

The attached DLD function works as follows in octave 3.2.4:

>> nel = 5; ndof = 10; nsh = 4; nqn = 9;
>> in = ones (nqn, nsh, nel);
>> connectivity = [1 2 3 4; 2 3 4 5; 6 7 8 9; 10 1 2 3; 1 2 3 4; 2 3 4 5; 3 4 5 
>> 6; 1 2 3 4; 2 3 4 5; 6 7 8 9]';
>> A = test_ndarray_sparse (in, nel, nsh, nqn, ndof, connectivity);
>> full (A)
ans =

   27   27   27   18    0    0    0    0    0    9
   27   36   36   27    9    0    0    0    0    9
   27   36   36   27    9    0    0    0    0    9
   18   27   27   27    9    0    0    0    0    0
    0    9    9    9    9    0    0    0    0    0
    0    0    0    0    0    9    9    9    9    0
    0    0    0    0    0    9    9    9    9    0
    0    0    0    0    0    9    9    9    9    0
    0    0    0    0    0    9    9    9    9    0
    9    9    9    0    0    0    0    0    0    9

>> 

while in version 3.3.54+ (built just before the Xmas break) I get

>> nel = 5; ndof = 10; nsh = 4; nqn = 9;
>> in = ones (nqn, nsh, nel);
>> connectivity = [1 2 3 4; 2 3 4 5; 6 7 8 9; 10 1 2 3; 1 2 3 4; 2 3 4 5; 3 4 5 
>> 6; 1 2 3 4; 2 3 4 5; 6 7 8 9]';
>> A = test_ndarray_sparse (in, nel, nsh, nqn, ndof, connectivity);
octave(1870,0xa01e8540) malloc: *** error for object 0x5a353f4: incorrect 
checksum for freed object - object was probably modified after being freed.
*** set a breakpoint in malloc_error_break to debug
panic: Segmentation fault -- stopping myself...
Segmentation fault

Can someone please help me find out (or give me some pointers) what has changed 
between versions that might be causing this problem?

Many thanks in advance,
Carlo

test_ndarray_sparse.cc
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