June 2009 - CLN-list

CLN 1.3.0 has been released
by Richard B. Kreckel 01 Jul '09

01 Jul '09

Hi! It may be obtained from the usual place: <http://www.ginac.de/CLN/>. Luck! -richy. -- Richard B. Kreckel <http://www.ginac.de/~kreckel/>

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CLN 1.3.0 coming soon
by Richard B. Kreckel 24 Jun '09

24 Jun '09

Hi, I've successfully compiled the current CLN git snapshot on all Debian architectures and plan to release it soon. Please give it a try and report any problem you find to this list. You may get the tarball from: <ftp://ftp.debian.org/debian/pool/main/c/cln/cln_1.3.0~beta2.orig.tar.gz>. Bye -richy. -- Richard B. Kreckel <http://www.ginac.de/~kreckel/>

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Re: [CLN-list] how to locate arrays in CLN library
by Richard B. Kreckel 19 Jun '09

19 Jun '09

Hi! Breta, please direct qustions regarding CLN to the mailing list. Thanks. sopik(a)fzu.cz wrote: > first of all, I'd like to thank you for being interested. You're right, it > wasn't very clever to ask without giving any example code. Here it is > > #include <cln/complex.h> > #include <cln/complex_io.h> > #include <cln/float.h> > #include <iostream> > > using namespace std; > using namespace cln; > float_format_t default_float_format = float_format(40); > > int main(void) > { > int i, N = 10; > cl_N *A; > > A = (cl_N*)malloc(sizeof(cl_N)*N); > for(i=0; i<N; i++) { > *(A+i) = complex(cl_float(i),cl_float(2)); > } > for(i=0; i<N; i++) { > cout << *(A+i) << endl; > } > cout << "See, it works!" << endl; > } > > The understandable error message is: > Unauthorized access to memory (SIGSEGV) > > However I don't know, how to do things properly. > Thank you for any advice. Remember that malloc gives you a chunk of *uninitialized* memory. And inside the first loop you are assigning one cl_N to another one, but the first one does not exist yet. That results in undefined behavior. You could either read up on the C++ feature "placement new" or, better, simply use C++ standard containers instead of malloc'ed memory. Try pushing your cl_N into a std::vector<cln::cl_N>. This way, you don't have to worry about freeing your memory later. Hope this helps -rbk. -- Richard B. Kreckel <http://www.ginac.de/~kreckel/>

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Re: [CLN-list] how to locate arrays in CLN library
by sopik＠fzu.cz 19 Jun '09

19 Jun '09

Hi, first of all, I'd like to thank you for being interested. You're right, it wasn't very clever to ask without giving any example code. Here it is #include <cln/complex.h> #include <cln/complex_io.h> #include <cln/float.h> #include <iostream> using namespace std; using namespace cln; float_format_t default_float_format = float_format(40); int main(void) { int i, N = 10; cl_N *A; A = (cl_N*)malloc(sizeof(cl_N)*N); for(i=0; i<N; i++) { *(A+i) = complex(cl_float(i),cl_float(2)); } for(i=0; i<N; i++) { cout << *(A+i) << endl; } cout << "See, it works!" << endl; } The understandable error message is: Unauthorized access to memory (SIGSEGV) However I don't know, how to do things properly. Thank you for any advice. Breta > Hi, > > sopik(a)fzu.cz wrote: >> I'd like to to work with fields of complex numbers of high precision using >> the CLN library. I can't successfuly allocate the memory using memalloc however. I tired few possibilities, but nothing worked. There is no notice >> about this topic in manual or in mail discussion, so it seems to be straightforward. But I have no idea how to do it. > > I'm not sure what you are trying to do, but working with complex numbers is straightforward. This is C++ and you should rely on the power of constructors/destructors and, if necessary, use new/delete for memory management, instead of malloc/free. > > Here is a working mini-example: > > #include <cln/cln.h> > #include <iostream> > using namespace std; > using namespace cln; > > int main() > { > cl_N x = -4; > cl_N sqrt_x = sqrt( x ); > if ( sqrt_x == complex( 0, 2 ) ) { > cout << "See, it works!" << endl; > } > } > > If this doesn't help, please post some example code. > > Best wishes > -rbk. > -- > Richard B. Kreckel > <http://www.ginac.de/~kreckel/> >

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how to locate arrays in CLN library
by sopik＠fzu.cz 18 Jun '09

18 Jun '09

Hi, I'd like to to work with fields of complex numbers of high precision using the CLN library. I can't successfuly allocate the memory using memalloc however. I tired few possibilities, but nothing worked. There is no notice about this topic in manual or in mail discussion, so it seems to be straightforward. But I have no idea how to do it. Thanks for a help Breta Sopik

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