C function for matching numeric vectors and calculating error / difference. This was used to detect difference between FFT results
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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include "src/vec_match.h"
#define DATA_LEN 16
#define REF_LEN 8
static float reference[DATA_LEN] = {
//0, 10, 20, 30, 40, 50, 40, 30, 20, 10, 0
0, 15.7, 0, 0, 0.1, 0.2, 0.1, 10, 24.242, 0, 0, 2, 0.2, 0.4, 0.5, 0
};
static float data[DATA_LEN] = {
//0, 10, 20, 30, 40, 50, 50, 35, 15, 15, 0
0, 15.7, 0, 0, 0.1, 0.2, 0.1, 10, 24.242, 0, 0, 2, 0.2, 0.4, 0.5, 0
};
static float ref_p[REF_LEN];
//static float data_cprs[16] = {
// 0, 15.7, 0, 0, 0.1, 0.2, 0.1, 10, 24.242, 0, 0, 2, 0.2, 0.4, 0.5, 0
//};
//static float data_packed[16];
int main(void)
{
/* for (int i = 0; i < 16; i++) {
printf("%.1f, ", data_cprs[i]);
}
printf("\n");
int pklen = vec_pack(data_packed, 16, data_cprs, 16, 2);
printf("compressed len = %d\n", pklen);
for (int i = 0; i < pklen; i++) {
printf("%.1f, ", data_packed[i]);
}
printf("\n");
pack_walker_t pw;
pw_init(&pw, data_packed, pklen);
for(int i=0; i<16; i++) {
printf("Value at %d is %.1f\n", i, pw_get(&pw, i));
}
int i = 8;
printf("Value at %d is %.1f\n", i, pw_get(&pw, i));
i = 7;
printf("Value at %d is %.1f\n", i, pw_get(&pw, i));
i = 1;
printf("Value at %d is %.1f\n", i, pw_get(&pw, i));
i = 15;
printf("Value at %d is %.1f\n", i, pw_get(&pw, i));
i = 11;
printf("Value at %d is %.1f\n", i, pw_get(&pw, i));
i = 12;
printf("Value at %d is %.1f\n", i, pw_get(&pw, i));*/
/* len = vec_unpack(data_cprs3, 16, data_cprs2, len);
printf("unpacked len = %d\n", len);
for (int i = 0; i < len; i++) {
printf("%.1f, ", data_cprs3[i]);
}
printf("\n");
*/
//return 0;
vec_match_cfg_t cfg = {
.length = DATA_LEN,
.drift_x = 1,
.offset_y = 1,
.abs_threshold = 0.1
};
// example
printf("REF: ");
for (int i = 0; i < DATA_LEN; i++) {
printf("%.1f, ", reference[i]);
}
printf("\n");
printf("MEAS: ");
for (int i = 0; i < DATA_LEN; i++) {
printf("%.1f, ", data[i]);
}
printf("\n");
// error metric fields
float env_e, abs_e;
bool ok = vec_match(data, reference, &cfg, &env_e, &abs_e);
printf("%s", ok ? "MATCH OK" : "MATCH FAILED");
printf("\n");
printf("Error rate: ENV %.2f, ABS %.2f\n", env_e, abs_e);
float thr;
int ref_pack_len = vec_pack_fit(ref_p, REF_LEN, reference, DATA_LEN, &thr);
printf("Reference packed with zero threshold %.1f to %d items.\n", thr, ref_pack_len);
printf("REF packed: ");
for (int i = 0; i < ref_pack_len; i++) {
printf("%.1f, ", ref_p[i]);
}
printf("\n");
pack_walker_t pw;
pw_init(&pw, ref_p, ref_pack_len);
printf("Value #8 = %.1f\n", pw_get(&pw, 8));
printf("Value #7 = %.1f\n", pw_get(&pw, 7));
printf("Value #15 = %.1f\n", pw_get(&pw, 15));
printf("Trying packed match\n");
ok = vec_match_packed(data, ref_p, ref_pack_len, &cfg, &env_e, &abs_e);
printf("%s", ok ? "MATCH OK" : "MATCH FAILED");
printf("\n");
printf("Error rate: ENV %.2f, ABS %.2f\n", env_e, abs_e);
}