From 43f06890e2689af2ef54c4480fe5790692a24f65 Mon Sep 17 00:00:00 2001
From: Elizabeth Hunt <elizabeth.hunt@simponic.xyz>
Date: Wed, 11 Oct 2023 10:04:04 -0600
Subject: deprecate common lisp solutions and write c; it's too much effort to
 keep up with the requirements for an archive.

---
 src/vector.c | 90 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 src/vector.c

(limited to 'src/vector.c')

diff --git a/src/vector.c b/src/vector.c
new file mode 100644
index 0000000..61692e1
--- /dev/null
+++ b/src/vector.c
@@ -0,0 +1,90 @@
+#include "lizfcm.h"
+#include <assert.h>
+#include <float.h>
+#include <math.h>
+#include <stdio.h>
+
+double l2_norm(Array_double *v) {
+  double norm = 0;
+  for (size_t i = 0; i < v->size; ++i)
+    norm += v->data[i] * v->data[i];
+  return sqrt(norm);
+}
+
+double l1_norm(Array_double *v) {
+  double sum = 0;
+  for (size_t i = 0; i < v->size; ++i)
+    sum += fabs(v->data[i]);
+  return sum;
+}
+
+double linf_norm(Array_double *v) {
+  double max = -DBL_MAX;
+  for (size_t i = 0; i < v->size; ++i)
+    max = c_max(v->data[i], max);
+  return max;
+}
+
+Array_double *minus_v(Array_double *v1, Array_double *v2) {
+  assert(v1->size == v2->size);
+
+  Array_double *sub = InitArrayWithSize(double, v1->size, 0);
+  for (size_t i = 0; i < v1->size; i++)
+    sub->data[i] = v1->data[i] - v2->data[i];
+  return sub;
+}
+
+double sum_v(Array_double *v) {
+  double sum = 0;
+  for (size_t i = 0; i < v->size; i++)
+    sum += v->data[i];
+  return sum;
+}
+
+Array_double *add_v(Array_double *v1, Array_double *v2) {
+  assert(v1->size == v2->size);
+
+  Array_double *sum = InitArrayWithSize(double, v1->size, 0);
+  for (size_t i = 0; i < v1->size; i++)
+    sum->data[i] = v1->data[i] + v2->data[i];
+  return sum;
+}
+
+double dot_v(Array_double *v1, Array_double *v2) {
+  assert(v1->size == v2->size);
+
+  double dot = 0;
+  for (size_t i = 0; i < v1->size; i++)
+    dot += v1->data[i] * v2->data[i];
+  return dot;
+}
+
+double l2_distance(Array_double *v1, Array_double *v2) {
+  Array_double *minus = minus_v(v1, v2);
+  double dist = l2_norm(minus);
+  free(minus);
+  return dist;
+}
+
+double l1_distance(Array_double *v1, Array_double *v2) {
+  Array_double *minus = minus_v(v1, v2);
+  double dist = l1_norm(minus);
+  free(minus);
+  return dist;
+}
+
+double linf_distance(Array_double *v1, Array_double *v2) {
+  Array_double *minus = minus_v(v1, v2);
+  double dist = linf_norm(minus);
+  free(minus);
+  return dist;
+}
+
+void format_vector_into(Array_double *v, char *s) {
+  sprintf(s, "");
+  if (v->size == 0)
+    sprintf(s, "empty");
+
+  for (size_t i = 0; i < v->size; ++i)
+    sprintf(s, "%s %f,", s, v->data[i]);
+}
-- 
cgit v1.2.3-70-g09d2