PtPoly PolySubtraction (PtPoly ppoly1, PtPoly ppoly2)
{
PtPoly Sub; unsigned int Degree, I, Invert = 0;
if (!ValidPolys (ppoly1, ppoly2)) return NULL;
if(ppoly1->Degree < ppoly2->Degree) {
Degree = ppoly1->Degree ;
Invert = 1;
}else{
Degree = ppoly2-> Degree;
}
if ((Sub = PolyCopy ((ppoly1->Degree >= ppoly2->Degree) ? ppoly1 : ppoly2)) == NULL) { Error = NO_MEM; return NULL; }
Error = OK;
if (Invert) Sub = PolySymmetrical(Sub);
for (I = 0; I <= Degree; I++)
Sub->Poly[I] = ppoly1->Poly[I] - ppoly2->Poly[I];
ReducePoly(Sub);
return Sub;
}
PtPoly PolyMultiplication (PtPoly ppoly1, PtPoly ppoly2)
{
if(!ValidPolys(ppoly1,ppoly2))
return NULL;
if(ppoly1==NULL || ppoly2==NULL){
Error = NO_POLY;
return NULL;
}
PtPoly mul;
int degree = ppoly1->Degree + ppoly2->Degree;
if((mul = PolyCreate(degree)) == NULL){
return NULL;
}
for (int i = 0; i <= ppoly1->Degree ; ++i) {
for (int j = 0; j <= ppoly2->Degree ; ++j) {
mul->Poly[i + j] += ppoly1->Poly[i] * ppoly2->Poly[j];
}
}
Error = OK;
ReducePoly(mul);
return mul;
}
int PolyEquals (PtPoly ppoly, PtPoly ppoly2)
{
bool sameDegree = false;
bool sameElem = false;
ReducePoly(ppoly);
ReducePoly(ppoly2);
if(ppoly->Degree == ppoly2->Degree){
sameDegree = true;
}else{
return 0;
}
for (int i = 0; i <= ppoly2->Degree; ++i) {
if(ppoly->Poly[i]!=ppoly2->Poly[i]){
sameElem = false;
return 0;
}
}
return 1;
}
PtPoly PolyAddition (PtPoly ppoly1, PtPoly ppoly2)
{
if(!ValidPolys(ppoly1,ppoly2))
return NULL;
if(ppoly1==NULL || ppoly2==NULL){
Error = NO_POLY;
}
int smallestDegree;
int biggestDegree;
int biggest = 0; /* considera-se o ppoly1 */
if(ppoly1->Degree > ppoly2->Degree){
biggestDegree = ppoly1->Degree;
smallestDegree = ppoly2->Degree;
}else{
biggestDegree = ppoly2->Degree;
smallestDegree = ppoly1->Degree;
biggest = 1;
}
PtPoly sum;
if((sum = PolyCreate(biggestDegree)) == NULL){
return NULL;
}
for (int i = 0; i <= smallestDegree ; ++i) {
sum->Poly[i] = ppoly1->Poly[i] + ppoly2->Poly[i];
}
for (int j = smallestDegree + 1; j <= biggestDegree; ++j) {
if(biggest)
sum->Poly[j] = ppoly2->Poly[j];
else
sum->Poly[j] = ppoly1->Poly[j];
}
Error = OK;
ReducePoly(sum);
return sum;
}
PtPoly PolyCopy (PtPoly ppoly)
{
PtPoly Copy; int I;
/* verifica se o vector existe - verifies if vector exists */
if (ppoly == NULL) { Error = NO_POLY; return NULL; }
/* criação do vector copia nulo - creating an empty vector */
if ((Copy = PolyCreate (ppoly->Degree+1)) == NULL) return NULL;
/* fazer a copia do vector - copying the components */
for (I = 0; I < ppoly->Degree+1; I++) Copy->Poly[I] = ppoly->Poly[I];
ReducePoly(Copy);
return Copy; /* devolve o vector copia - returning the new vector */
}
PtPoly PolySubtraction (PtPoly ppoly1, PtPoly ppoly2)
{
PtPoly sub;
/* Check validity of polynomials */
if (!ValidPolys(ppoly1, ppoly2))
return NULL;
int smallestDegree;
int biggestDegree;
int biggest = 0; /* considera-se o ppoly1 */
if(ppoly1->Degree > ppoly2->Degree){
biggestDegree = ppoly1->Degree;
smallestDegree = ppoly2->Degree;
}else{
biggestDegree = ppoly2->Degree;
smallestDegree = ppoly1->Degree;
biggest = 1;
}
if((sub = PolyCreate(biggestDegree)) == NULL){
return NULL;
}
for (int i = 0; i <= smallestDegree ; ++i) {
sub->Poly[i] = ppoly1->Poly[i] - ppoly2->Poly[i];
}
for (int j = smallestDegree + 1; j <= biggestDegree; ++j) {
if (biggest && sub->Poly[j] != 0)
sub->Poly[j] = ppoly2->Poly[j] * (-1);
else
sub->Poly[j] = ppoly1->Poly[j];
}
ReducePoly(sub);
Error = OK;
return sub;
}
PtPoly PolyAddition (PtPoly ppoly1, PtPoly ppoly2)
{
PtPoly Add; unsigned int I, Degree;
if (!ValidPolys (ppoly1, ppoly2)) return NULL;
Degree = (ppoly1->Degree < ppoly2->Degree) ? ppoly1->Degree : ppoly2-> Degree;
if ((Add = PolyCopy ((ppoly1->Degree >= ppoly2->Degree) ? ppoly1 : ppoly2)) == NULL) { Error = NO_MEM; return NULL; }
Error = OK;
for (I = 0; I <= Degree; I++){
Add->Poly[I] = ppoly1->Poly[I] + ppoly2->Poly[I];
}
ReducePoly(Add);
return Add;
}
PtPoly PolyMultiplication (PtPoly ppoly1, PtPoly ppoly2)
{
PtPoly Mult; unsigned int I,J,TotalDegree;
if (!ValidPolys (ppoly1, ppoly2)) return NULL;
TotalDegree = ppoly1->Degree + ppoly2->Degree;
if ((Mult = PolyCreate(TotalDegree)) == NULL) { Error = NO_MEM; return NULL; }
Error = OK;
for (I = 0; I <= TotalDegree; I++)
Mult->Poly[I] = 0;
for (I = 0; I <= ppoly1->Degree; I++ ){
for(J = 0; J <= ppoly2->Degree; J++)
Mult->Poly[I+J] += ppoly1->Poly[I] * ppoly2->Poly[J];
}
ReducePoly(Mult);
return Mult;
}
