pitrix/tools.h

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2019-05-21 03:52:57 +00:00
typedef struct Vector {
double x1;
double x2;
} Vector;
typedef struct Matrix {
double a11;
double a12;
double a21;
double a22;
} Matrix;
struct Matrix multiply(struct Matrix m1, struct Matrix m2) {
Matrix r = {
.a11 = m1.a11*m2.a11 + m1.a12*m2.a21,
.a12 = m1.a11*m2.a12 + m1.a12*m2.a22,
.a21 = m1.a21*m2.a11 + m1.a22*m2.a21,
.a22 = m1.a21*m2.a12 + m1.a22*m2.a22
};
return r;
};
struct Vector multiply(struct Matrix m, struct Vector v) {
Vector r = {
.x1 = (m.a11*v.x1) + (m.a12*v.x2),
.x2 = (m.a21*v.x1) + (m.a22*v.x2)
};
return r;
}
struct Vector add(struct Vector v1, struct Vector v2) {
Vector r = {
.x1 = v1.x1 + v2.x2,
.x2 = v1.x2 + v2.x2
};
return r;
}