正如标题所说，我想在矩阵和向量之间创建一个乘法，它们都填充了随机数（double类型）。这是我用来生成它们的函数：
double random(double min, double max) {
double number = (double)rand() / RAND_MAX;
return min + number * (max - min);
}
我还编写了Vec，RandomVec和RandomMat类，我可以毫无问题地创建它们：
＆＃34; VEC＆＃34;和＆＃34; RandomVector＆＃34;类
struct Vec {
double* v;
unsigned int size;
Vec()
: v(new double[4]), size(4) {
memset(v, 0, size * 4);
}
Vec(const unsigned int size)
: v(new double[size]), size(size) {
memset(v, 0, size * 4);
}
Vec(double input[])
: v(input), size(sizeof(input) / sizeof(double)) {
}
void set(const unsigned int row, const double value) {
v[row] = value;
}
void print() {
for (unsigned int i = 0; i < size; i++) {
std::cout << v[i] << std::endl;
}
}
~Vec() {
delete[] v;
}
};
struct RandomVec {
double* v;
unsigned int size;
RandomVec()
: v(new double[4]), size(4) {
for (unsigned int i = 0; i < size; i++) {
v[i] = random(0, 1);
}
}
RandomVec(const unsigned int size)
: v(new double[size]), size(size) {
for (unsigned int i = 0; i < size; i++) {
v[i] = random(0, 1);
}
}
RandomVec(const unsigned int size, const double min, const double max)
: v(new double[size]), size(size) {
for (unsigned int i = 0; i < size; i++) {
v[i] = random(min, max);
}
}
void set(const unsigned int row, const double value) {
v[row] = value;
}
void print() {
for (unsigned int i = 0; i < size; i++) {
std::cout << v[i] << std::endl;
}
}
~RandomVec() {
delete[] v;
}
};
＆＃34; RandomMat＆＃34;
struct RandomMat {
double* m;
unsigned int rows;
unsigned int columns;
RandomMat()
: m(new double[4 * 4]), rows(4), columns(4) {
for (unsigned int i = 0; i < rows * columns; i++) {
m[i] = random(0, 1);
}
}
RandomMat(const unsigned int rows, const unsigned int columns)
: m(new double[rows * columns]), rows(rows), columns(columns) {
for (unsigned int i = 0; i < rows * columns; i++) {
m[i] = random(0, 1);
}
}
RandomMat(const unsigned int rows, const unsigned int columns, const double min, const double max)
: m(new double[rows * columns]), rows(rows), columns(columns) {
for (unsigned int i = 0; i < rows * columns; i++) {
m[i] = random(min, max);
}
}
void print() {
for (unsigned int i = 0; i < rows * columns; i++) {
std::cout << m[i] << std::endl;
}
}
~RandomMat() {
delete[] m;
}
};
现在，当我尝试将这些函数与具有以下函数的对象相乘时，程序崩溃了：
Vec operator*(RandomMat& RandomMat, RandomVec& RandomVec) {
Vec Result;
for (unsigned int row = 0; row < RandomVec.size; row++) {
double sum = 0;
for (unsigned int column = 0; column < RandomVec.size; column++) {
sum += RandomMat.m[row * RandomVec.size + column] * RandomVec.v[column];
}
Result.set(row, sum);
}
return Result;
}
我真的不知道为什么会这样，希望你能帮我解决这个问题。 ＆GT;。＆LT;此外，我对编程还是一个新手，所以我真的很感激你有任何改进我的代码的提示（性能明智吗？）。 ：）