Jack Fearnley on Tue, 05 May 2009 22:57:33 +0200

 Re: Updating an old C program which uses parilib

 Bill Allombert wrote: ```On Tue, May 05, 2009 at 10:58:16AM -0400, Jack Fearnley wrote: ``` ```I am trying to run a program I wrote and ran successfully some years back. It computes Dirichlet twists of elliptic L-functions. The program uses lisGEN which seems no longer to exist. The usage is ee = smallinitell(lisGEN(stdin)); where stdin contains [0,1,0,4,4] for example. There seems to be no exact replacement for this function so I am using scanf to read the five coefficients as longs and then using mkvecn to package the coefficients into a vector. scanf("%ld %ld %ld %ld %ld",&c1,&c2,&c3,&c4,&c5); printf("%ld %ld %ld %ld %ld \n",c1,c2,c3,c4,c5); eee=mkvecn(5,(GEN)c1,(GEN)c2,(GEN)c3,(GEN)c4,(GEN)c5); ee = smallinitell(eee); Where ee and eee are defined as GEN. The printed result is 0 1 0 4 4 *** segmentation fault: bug in PARI or calling program. *** Error in the PARI system. End of program. 1) Is there an exact replacement for lisGEN? ``` ``` yes, gp_read_stream. thought it seems we forgot to add it to the COMPAT file. ``` ```2) Am I doing something stupid? In previous variations to solve this problem I have encountered stack overflow and an 'undefined' gzero. ``` ``` Filling my answer below should not be interpreted as a positive answer to your question :) anyway it appears that the line eee=mkvecn(5,(GEN)c1,(GEN)c2,(GEN)c3,(GEN)c4,(GEN)c5); cannot work: casting C long integer to GEN using (GEN) does not work: you must use stoi: mkvecn(5,stoi(c1),stoi(c2),stoi(c3),stoi(c4),stoi(c5)); ``` ```3) Where did gzero go? ``` ``` It has been renamed to gen_0, see the COMPAT file. Cheers, Bill. ``` Many thanks Bill!  My program now works. Jack Fearnley