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percentile.c
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percentile.c
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#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#define TOL 0.00001
int main(int argc, char** argv) {
if (argc < 3) {
fprintf(stderr, "Usage: cat cdf-datafile | %s <variance-value> percentile1 [percentile2 ...]\n", argv[0]);
fprintf(stderr, "Percentile input values must be sorted in increasing order for correctness. Percentiles must be integers.\n");
exit(0);
}
double reqvar = atof(argv[1]);
double npercs = argc - 2;
int* percvalues = (int*)malloc(npercs * sizeof(int));
int i;
// Read in percentile numbers, and print a header for the
// output along the way
for (i=0; i < npercs; i++) {
percvalues[i] = atoi(argv[i+2]);
}
double x, p, prev_x = 0.0, prev_p = 0.0;
int lastperc_index = 0;
double required_percentile = percvalues[0] / 100.0;
printf("%lf ", reqvar);
while (lastperc_index < npercs) {
if (scanf("%lf %lf\n", &x, &p) > 0) { // just read a line of data
while (lastperc_index < npercs && p >= required_percentile) {
printf("%lf ", x);
lastperc_index ++;
if (lastperc_index < npercs) required_percentile = percvalues[lastperc_index] / 100.0;
}
}
else break;
}
printf("\n");
/* // old version of the loop */
/* while (scanf("%lf %lf\n", &x, &p) > 0) { */
/* if (p >= required_percentile) { */
/* // print out data point */
/* printf("%lf %lf\n", reqvar, x); */
/* lastperc_index ++; */
/* if (lastperc_index < npercs) { */
/* required_percentile = percvalues[lastperc_index]; */
/* } */
/* else { */
/* break; */
/* } */
/* } */
/* } */
return 0;
}