I confirm the last example in
https://help.scilab.org/docs/6.1.0/en_US/bvode.html returns the
following error - on a Windows 10 machine:
--> exec('D:\Userdata\Claus\Documents\Scilab\bvode_example.sce', -1)
VERSION *COLNEW* OF COLSYS .
THE MAXIMUM NUMBER OF SUBINTERVALS IS MIN ( 117 (ALLOWED FROM FSPACE),
124 (ALLOWED FROM ISPACE) )
THE NEW MESH (OF 4 SUBINTERVALS), 0.000000 0.500000
1.000000 1.450000 1.900000
CONVERGENCE AFTER 3 ITERATIONS
THE NEW MESH (OF 8 SUBINTERVALS), 0.000000 0.250000
0.500000 0.750000 1.000000 1.225000 1.450000 1.675000
1.900000
CONVERGENCE AFTER 1 ITERATIONS
VERSION *COLNEW* OF COLSYS .
THE MAXIMUM NUMBER OF SUBINTERVALS IS MIN ( 117 (ALLOWED FROM FSPACE),
124 (ALLOWED FROM ISPACE) )
THE FORMER MESH (OF 4 SUBINTERVALS), 0.000000 0.000000
0.000000 0.000000 0.000000
THE NEW MESH (OF 2 SUBINTERVALS), 0.000000 0.000000 1.900000
****** DOMAIN ERROR IN APPROX ****** X = 0.2141331642D+00 ALEFT
= 0.0000000000D+00 ARIGHT = 0.0000000000D+00
****** DOMAIN ERROR IN APPROX ****** X = 0.9500000000D+00 ALEFT
= 0.0000000000D+00 ARIGHT = 0.0000000000D+00
****** DOMAIN ERROR IN APPROX ****** X = 0.1685866836D+01 ALEFT
= 0.0000000000D+00 ARIGHT = 0.0000000000D+00
THE GLOBAL BVP-MATRIX IS SINGULAR
at line 122 of executed file
D:\Userdata\Claus\Documents\Scilab\bvode_example.sce
bvode: The collocation matrix is singular.
... Line 122 is of course the execution of bvode:
sol=bvodex|(res,ncomp,m,aleft,aright,zeta,ipar,ltol,tol,fixpnt,...
fsub,dfsub,gsub,dgsub,guess);
/Claus
On 15-07-2020 19:39, Rene Djack wrote:
Hello,
I' m new to this list and to scilab too!
Working on bvode, I try the example "Quantum Neumann equation" found
in the scilab help and i get the error message
"Collocation matrix is singular"
Is this example broken?
Somebody have the same message?
I'm using scilab 6.10 from scilab-6.10.bin.linux-x86-64.tar.gz on
Ubuntu 20.4
Tanks for reading
Regards
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