4 files changed, 96 insertions, 84 deletions
diff --git a/lib/measurement.c b/lib/measurement.c
new file mode 100644
index 0000000..435c749
--- /dev/null
+++ b/lib/measurement.c
@@ -0,0 +1,62 @@
+
+#include "measurement.h"
+
+double add_to_avg(double mx, double x, count_t n) {
+  return mx * (n / (n + 1.0)) + x * 1.0 / (n + 1.0);
+}
+
+void update_meas(meas_t *m, double x) {
+  count_t n = m->n;
+
+  m->x = add_to_avg(m->x, x, n);
+  m->x2 = add_to_avg(m->x2, pow(x, 2), n);
+
+  m->m2 = add_to_avg(m->m2, pow(x - m->x, 2), n);
+  m->m4 = add_to_avg(m->m4, pow(x - m->x, 4), n);
+
+  if (n > 1) {
+    double s2 = n / (n - 1.) * (m->x2 - pow(m->x, 2));
+    m->dx = sqrt(s2 / n);
+    m->c = s2;
+    m->dc = sqrt((m->m4 - (n - 3.)/(n - 1.) * pow(m->m2, 2)) / n);
+  }
+
+  (m->n)++;
+}
+
+void update_autocorr(autocorr_t *OO, double O) {
+  OO->O = add_to_avg(OO->O, O, OO->n);
+  OO->O2 = add_to_avg(OO->O2, pow(O, 2), OO->n);
+
+  dll_t *Otmp = OO->Op;
+  dll_t *Osave;
+  count_t t = 0;
+
+  while (Otmp != NULL) {
+    OO->OO[t] = add_to_avg(OO->OO[t], O * (Otmp->x), OO->n - t - 1);
+    t++;
+    if (t == OO->W - 1) {
+      Osave = Otmp;
+    }
+    Otmp = Otmp->next;
+  }
+
+  if (t == OO->W) {
+    if (OO->W == 1) {
+      free(OO->Op);
+      OO->Op = NULL;
+    } else {
+      free(Osave->next);
+      Osave->next = NULL;
+    }
+  }
+
+  stack_push_d(&(OO->Op), O);
+
+  OO->n++;
+}
+
+double rho(autocorr_t *o, count_t i) {
+  return (o->OO[i] - pow(o->O, 2)) / (o->O2 - pow(o->O, 2));
+}
+
diff --git a/lib/measurement.h b/lib/measurement.h
new file mode 100644
index 0000000..4ced4dc
--- /dev/null
+++ b/lib/measurement.h
@@ -0,0 +1,33 @@
+
+#include <math.h>
+#include <stdlib.h>
+
+#include "types.h"
+#include "stack.h"
+
+typedef struct {
+  uint64_t n;
+  double x;
+  double dx;
+  double x2;
+  double m2;
+  double m4;
+  double c;
+  double dc;
+} meas_t;
+
+typedef struct {
+  uint64_t n;
+  uint64_t W;
+  double *OO;
+  dll_t *Op;
+  double O;
+  double O2;
+} autocorr_t;
+
+void update_meas(meas_t *m, double x);
+
+void update_autocorr(autocorr_t *OO, double O);
+
+double rho(autocorr_t *o, uint64_t i);
+
diff --git a/lib/wolff.h b/lib/wolff.h
index 44e5926..ce7040a 100644
--- a/lib/wolff.h
+++ b/lib/wolff.h
@@ -19,6 +19,7 @@
 #include "convex.h"
 #include "graph.h"
 #include "tree.h"
+#include "measurement.h"
 
 typedef struct {
   graph_t *g;
@@ -33,33 +34,7 @@ typedef struct {
   q_t q;
 } ising_state_t;
 
-typedef struct {
-  uint64_t n;
-  double x;
-  double dx;
-  double x2;
-  double m2;
-  double m4;
-  double c;
-  double dc;
-} meas_t;
-
-typedef struct {
-  uint64_t n;
-  uint64_t W;
-  double *OO;
-  dll_t *Op;
-  double O;
-  double O2;
-} autocorr_t;
-
 v_t flip_cluster(ising_state_t *s, v_t v0, q_t s1, gsl_rng *r);
 
 graph_t *graph_add_ext(const graph_t *g);
 
-void update_meas(meas_t *m, double x);
-
-void update_autocorr(autocorr_t *OO, double O);
-
-double rho(autocorr_t *o, uint64_t i);
-
diff --git a/lib/wolff_tools.c b/lib/wolff_tools.c
index 20bc529..698d58c 100644
--- a/lib/wolff_tools.c
+++ b/lib/wolff_tools.c
@@ -71,61 +71,3 @@ v_t flip_cluster(ising_state_t *s, v_t v0, q_t step, gsl_rng *r) {
   return nv;
 }
 
-double add_to_avg(double mx, double x, count_t n) {
-  return mx * (n / (n + 1.0)) + x * 1.0 / (n + 1.0);
-}
-
-void update_meas(meas_t *m, double x) {
-  count_t n = m->n;
-
-  m->x = add_to_avg(m->x, x, n);
-  m->x2 = add_to_avg(m->x2, pow(x, 2), n);
-
-  m->m2 = add_to_avg(m->m2, pow(x - m->x, 2), n);
-  m->m4 = add_to_avg(m->m4, pow(x - m->x, 4), n);
-
-  if (n > 1) {
-    double s2 = n / (n - 1.) * (m->x2 - pow(m->x, 2));
-    m->dx = sqrt(s2 / n);
-    m->c = s2;
-    m->dc = sqrt((m->m4 - (n - 3.)/(n - 1.) * pow(m->m2, 2)) / n);
-  }
-
-  (m->n)++;
-}
-
-void update_autocorr(autocorr_t *OO, double O) {
-  OO->O = add_to_avg(OO->O, O, OO->n);
-  OO->O2 = add_to_avg(OO->O2, pow(O, 2), OO->n);
-
-  dll_t *Otmp = OO->Op;
-  dll_t *Osave;
-  count_t t = 0;
-
-  while (Otmp != NULL) {
-    OO->OO[t] = add_to_avg(OO->OO[t], O * (Otmp->x), OO->n - t - 1);
-    t++;
-    if (t == OO->W - 1) {
-      Osave = Otmp;
-    }
-    Otmp = Otmp->next;
-  }
-
-  if (t == OO->W) {
-    if (OO->W == 1) {
-      free(OO->Op);
-      OO->Op = NULL;
-    } else {
-      free(Osave->next);
-      Osave->next = NULL;
-    }
-  }
-
-  stack_push_d(&(OO->Op), O);
-
-  OO->n++;
-}
-
-double rho(autocorr_t *o, count_t i) {
-  return (o->OO[i] - pow(o->O, 2)) / (o->O2 - pow(o->O, 2));
-}