std::vector<double> meanItemRating(gk_csr_t *mat) {
std::vector<double> meanRating(mat->ncols, 0);
std::vector<int> count(mat->ncols, 0);
for (int u = 0; u < mat->nrows; u++) {
for (int ii = mat->rowptr[u]; ii < mat->rowptr[u+1]; ii++) {
int item = mat->rowind[ii];
float rating = mat->rowval[ii];
meanRating[item] += rating;
count[item]++;
}
}
for (int i = 0; i < mat->ncols; i++) {
meanRating[i] = meanRating[i]/count[i];
}
return meanRating;
}
int main(int argc, char* argv[]) {
int test_mode = 0;
if (argc == 2) {
if (strcmp(argv[1], "test") == 0) {
test_mode = 1;
printf("[start_test]\n");
test_data();
}
}
else {
printf("Enter meal names and ratings in the form <name> <rating>.\n");
printf("No spaces are allowed in the name and the rating.\n");
printf("The rating can be * through *****.\n");
printf("To finish, enter \"end\" for a meal name.\n");
while (names < MAX_NAMES) {
char name[MAX_NAME_LENGTH];
char rating[MAX_RATING_LENGTH + 1];
printf("\nName and rating: ");
scanf("%s", &name);
if (strcmp(name, "end") == 0) {
break;
}
scanf("%s", rating);
addNameAndRating(name, rating);
}
printf("\n");
}
if (names) {
// Print data entered and call libRatings.addRating().
printf("This is the data you entered:\n");
for (int i = 0; i < names; i++) {
printf("%s (%s)\n", name_list[i], rating_list[i]);
addRating(rating_list[i]);
}
// Print statistical information.
printf("\nThe mean rating is %s\n", meanRating()); // 1
if (medianRating) { // 2
printf("The median rating is %s\n", medianRating());
}
if (frequentRating) { // 3
printf("The most frequent rating is %s\n", frequentRating());
}
//printf("\n");
}
if (test_mode) {
printf("[end_test]\n");
}
return 0;
}
