Question

Implementing the function method using c, some sample codes are showed below:

typedef struct{
double *vector;
int count;
int length;
}Vector;

Vector create_vector(int length){
Vector vec;
vec.vector = (int*)malloc(sizeof(int)*length);
if (vec.vector == NULL){
vec.length = 0;
vec.count =0;
return vec;
}vec.count =0;
vec.length = length;
}

/*
Calculate and return the variance of the elements in
a vector.
*/
double var(Vector vec) {
}

/*
Calculate and return the standard deviation of the
elements in a vector.
*/
double stdv(Vector vec) {
}

/*
Perform the calculation of the dot product of two vectors,
where dbl += v1[i] * v2[i] and return the resulting
double.
*/
double dot(Vector v1, Vector v2) {
}

/*
Perform an element by element comparison of two vectors.
If for every i, v1[i] == v2[i], and the count is equal
return 1, otherwise zero.
*/
int equals(Vector v1, Vector v2) {
}

Answer 1

please find the code, do comment if any syntax mismatch. i will be happy to help. thank you.

code:

typedef struct{
double *vector;
int count;
int length;
}Vector;
Vector create_vector(int length){
Vector vec;
vec.vector = (int*)malloc(sizeof(int)*length);
if (vec.vector == NULL){
vec.length = 0;
vec.count =0;
return vec;
}vec.count =0;
vec.length = length;
}
/*
Calculate and return the variance of the elements in
a vector.
*/
double var(Vector vec) {
int i,n;
double sum,sum1,average;
n= vec.length;
for (i = 0; i < n; i++)
{
scanf("%f", &vec[i]);
}
/* Compute the sum of all elements */
for (i = 0; i < n; i++)
{
sum = sum + vec[i];
}
average = sum / (float)n;
/* Compute variance */
for (i = 0; i < n; i++)
{
sum1 = sum1 + pow((vec[i] - average), 2);
}
variance = sum1 / (float)n;
return var;
}
/*
Calculate and return the standard deviation of the
elements in a vector.
*/
double stdv(Vector vec) {
double var = variance (vec);
return =sqrt(var);

}
/*
Perform the calculation of the dot product of two vectors,
where dbl += v1[i] * v2[i] and return the resulting
double.
*/
double dot(Vector v1, Vector v2) {
double result = 0.0;
int n = v1.length;
for (int i = 0; i < n; i++)
result += v1[i]*v2[i];
return result;
}
/*
Perform an element by element comparison of two vectors.
If for every i, v1[i] == v2[i], and the count is equal
return 1, otherwise zero.
*/
int equals(Vector v1, Vector v2) {
int n = v1.length;
int checker = 1;
for (int i = 0; i < n; i++)
{
if(v1[i] != v2[i])
{
checker=0;
break;
}
}
return checker;
  
}