1 | The following is valid for Singular 4-x-x: |
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2 | (for technical details see https://www.singular.uni-kl.de/Manual/modules.pdf) |
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3 | |
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4 | ./configure --disable-static .... |
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5 | |
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6 | make install |
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7 | |
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8 | --------------------------------------- |
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9 | how to compile and run the the example: |
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10 | libsingular-config --libs: gives the correct arguments for linking |
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11 | libsingular-config --cflags: gives the correct arguments for compiling |
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12 | g++ ...... -o tt tt.cc .... |
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13 | |
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14 | ./tt |
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15 | -------------------------------------- |
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16 | the example: |
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17 | #include <Singular/libsingular.h> |
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18 | main() |
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19 | { |
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20 | // init path names etc. |
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21 | siInit((char *)"/...lib/libSingular.so"); |
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22 | |
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23 | // construct the ring Z/32003[x,y,z] |
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24 | // the variable names |
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25 | char **n=(char**)omalloc(3*sizeof(char*)); |
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26 | n[0]=omStrDup("x"); |
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27 | n[1]=omStrDup("y"); |
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28 | n[2]=omStrDup("z2"); |
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29 | |
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30 | ring R=rDefault(32003,3,n); |
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31 | // make R the default ring: |
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32 | rChangeCurrRing(R); |
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33 | |
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34 | // create the polynomial 1 |
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35 | poly p1=p_ISet(1,R); |
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36 | |
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37 | // creat the polynomial 2*x^3*z^2 |
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38 | poly p2=p_ISet(2,R); |
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39 | pSetExp(p2,1,3); |
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40 | pSetExp(p2,3,2); |
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41 | pSetm(p2); |
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42 | |
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43 | // print p1 + p2 |
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44 | pWrite(p1); printf(" + \n"); pWrite(p2); printf("\n"); |
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45 | |
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46 | // compute p1+p2 |
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47 | p1=p_Add_q(p1,p2,R); p2=NULL; |
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48 | pWrite(p1); |
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49 | |
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50 | // clean up: |
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51 | pDelete(&p1); |
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52 | rKill(R); |
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53 | |
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54 | currentVoice=feInitStdin(NULL); |
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55 | // hook for error handling: |
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56 | // WerrorS_callback=......; of type p(const char *) |
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57 | int err=iiAllStart(NULL,"int ver=system(\"version\");\n",BT_proc,0); |
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58 | if (err) errorreported = 0; // reset error handling |
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59 | printf("interpreter returns %d\n",err); |
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60 | idhdl h=ggetid("ver"); |
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61 | if (h!=NULL) |
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62 | printf("singular variable ver of type %d contains %d\n",h->typ,(int)(long)IDDATA(h)); |
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63 | else |
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64 | printf("variable ver does not exist\n"); |
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65 | |
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66 | // calling a singular-library function |
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67 | idhdl datetime=ggetid("datetime"); |
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68 | if (datetime==NULL) |
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69 | printf("datetime not found\n"); |
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70 | else |
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71 | { |
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72 | BOOLEAN res=iiMake_proc(datetime,NULL,NULL); |
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73 | if (res) { printf("datetime return an error\n"); errorreported = 0; } |
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74 | else printf("datetime returned type %d, >>%s<<\n",iiRETURNEXPR.Typ(),(char *)iiRETURNEXPR.Data()); |
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75 | } |
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76 | |
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77 | // changing a ring for the interpreter |
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78 | // re-using n and R from above |
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79 | R=rDefault(32003,3,n); |
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80 | idhdl newRingHdl=enterid("R" /* ring name*/, |
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81 | 0, /*nesting level, 0=global*/ |
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82 | RING_CMD, |
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83 | &IDROOT, |
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84 | FALSE); |
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85 | IDRING(newRingHdl)=R; |
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86 | // make R the default ring (include rChangeCurrRing): |
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87 | rSetHdl(newRingHdl); |
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88 | myynest=1; /* <=0: interactive at eof/ >=1: non-interactive */ |
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89 | err=iiAllStart(NULL,"poly p=x;listvar();return();\n",BT_proc,0); |
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90 | |
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91 | // calling a kernel function via the interpreter interface |
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92 | sleftv r1; memset(&r1,0,sizeof(r1)); |
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93 | sleftv arg; memset(&arg,0,sizeof(r1)); |
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94 | arg.rtyp=STRING_CMD; |
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95 | arg.data=omStrDup("huhu"); |
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96 | err=iiExprArith1(&r1,&arg,TYPEOF_CMD); |
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97 | printf("interpreter returns %d\n",err); |
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98 | if (err) errorreported = 0; // reset error handling |
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99 | else printf("typeof returned type %d, >>%s<<\n",r1.Typ(),r1.Data()); |
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100 | // clean up r1: |
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101 | r1.CleanUp(); |
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102 | } |
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