Recent changes to support-requests

#3 Can Matcont solve piecewise function？Thank you！

hilmeijer — Wed, 06 Dec 2023 09:29:38 -0000

status: open --> closed
assigned_to: hilmeijer

#3 Can Matcont solve piecewise function？Thank you！

hilmeijer — Wed, 06 Dec 2023 09:27:17 -0000

Your question is quite general. If you can approximate it by some continuous function then perhaps. But without details or specific cases, I cannot say whether it is possible or not.

Can Matcont solve piecewise function？Thank you！

Hongxiang Jiang — Wed, 06 Dec 2023 06:02:07 -0000

Can Matcont solve piecewise function？thank you！

Can Matcont solve piecewise function？Thank you！

Hongxiang Jiang — Wed, 06 Dec 2023 06:02:07 -0000

Ticket 3 has been modified: Can Matcont solve piecewise function？Thank you！
Edited By: hilmeijer (hilmeijer)
Status updated: 'open' => 'closed'
Owner updated: None => 'hilmeijer'

#2 Weird results from cl_matcontM2p5

hilmeijer — Tue, 17 Oct 2023 06:55:13 -0000

status: open --> closed
Group: --> v1.0_(example)

#2 Weird results from cl_matcontM2p5

hilmeijer — Tue, 19 Aug 2014 06:50:02 -0000

cl_matcontM is for maps, not ODEs: hence the defining equations are different. Your results with cl_matcont are correct.

Weird results from cl_matcontM2p5

Nabeel Abo-Ghander — Sun, 11 Jul 2010 05:09:38 -0000

Hello
I observed ambiguous thing while I was trying to test cl_matcontM2p5 and
cl_matcont2.5.1 for Bratu Problem. The two toolboxes are giving different
answers for the same function file. In addition, the automatic
differentiation option is not working when it is enabled by giving it
a value of 1. The message received is:
#########################################################################

first point found
tangent vector to first point found
label = PD , x = ( 0.000000 0.000000 0.000000 )
??? Undefined function or method \'tcs\' for input arguments of type \'struct\'.

Error in ==> multilinear2AD at 50
ytayl2=2*tcs(y1);

Error in ==> multilinear2 at 13
vec2=multilinear2AD(mapsf,q1,q2,x0,p,n);

Error in ==> nf_PDm at 16
h2 =
(eye(nphase)-A)\\multilinear2(mapsf,vext,vext,x0,p,n,hessIncrement); %(I-A)\\B(q,q)

Error in ==> fixedpointmap>process at 261
s.data.b=nf_PDm(fpmds.func,fpmds.Jacobian,fpmds.Hessians,fpmds.Der3,jac,vext,wext,nphase,x0,p,n);

Error in ==> cont at 485
[failed,s] = feval(cds.curve_process, sid(si),
xss(:,si), vss(:,si), s );

Error in ==> Bratumain at 21
[x v s h f]=cont(@fixedPointmap,xo,[],opt);
###########################################################################
Please note that:
Attached is a word file containing the solution of the Bratu problem,
please observe the a-axis!
The matlab version used is 7.6.0.324 (R2008a)
kindly, may you please suggest some solutions for the problems above?
Anything wrong with cl_matcontM2p5?

Weird results from cl_matcontM2p5

Nabeel Abo-Ghander — Sun, 11 Jul 2010 05:09:38 -0000

Ticket 2 has been modified: Weird results from cl_matcontM2p5
Edited By: hilmeijer (hilmeijer)
Status updated: 'open' => 'closed'
milestone updated: '' => 'v1.0(example)'

Problem matcont+gcc

Anonymous — Thu, 13 Nov 2008 20:38:29 -0000

Hi, I have a problem to use matcont on matlab 7.3.0.
I use Ubuntu 8.04 and gcc 4.2.4
I have tried to install manually gcc 3.4.0, but I got the same error message:
---------------------------------------------------------------------------------------
Warning: You are using gcc version "4.2.4". The earliest gcc version supported
with mex is "3.4.0". The latest version tested for use with mex is "3.4.5".
To download a different version of gcc, visit http://gcc.gnu.org
BVP_LC_jac.c: In function ‘mexFunction’:
BVP_LC_jac.c:94: warning: assignment from incompatible pointer type
BVP_LC_jac.c:95: warning: assignment from incompatible pointer type
/usr/bin/ld: cannot find -lstdc++
collect2: ld returned 1 exit status

mex: link of 'BVP_LC_jac.mexglx' failed.

??? Error using ==> mex
Unable to complete successfully.

Error in ==> matcont at 51
----------------------------------------------------------------------
When I've tried to use gcc 3.4.0 the message was:
-----------------------------------------------------------------------------------
BVP_LC_jac.c: In function `mexFunction':
BVP_LC_jac.c:94: warning: assignment from incompatible pointer type
BVP_LC_jac.c:95: warning: assignment from incompatible pointer type
/usr/bin/ld: cannot find -lstdc++
collect2: ld returned 1 exit status

mex: link of 'BVP_LC_jac.mexglx' failed.

??? Error using ==> mex
Unable to complete successfully.

Error in ==> matcont at 51
mex -O BVP_LC_jac.c;
-------------------------------------------------------------------------------
I really don't know how to resolve this problem...
PS: matcont doesn't give me the chance to select another compiler at start, like it's explained in the user manual.

Luca