From 8eb0fbff3470bc56ec798101435f5e90e069b027 Mon Sep 17 00:00:00 2001
From: Jaron Kent-Dobias <jaron@kent-dobias.com>
Date: Tue, 30 Jun 2020 14:57:15 -0400
Subject: Added utility for producing moments from raw distributions.

---
 process_distributions.cpp | 66 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 process_distributions.cpp

diff --git a/process_distributions.cpp b/process_distributions.cpp
new file mode 100644
index 0000000..210b686
--- /dev/null
+++ b/process_distributions.cpp
@@ -0,0 +1,66 @@
+
+
+#include <cinttypes>
+#include <cmath>
+#include <fstream>
+#include <sstream>
+#include <string>
+#include <vector>
+#include <iostream>
+#include <iomanip>
+
+int main(int argc, char *argv[]) {
+  std::vector<std::string> all_args;
+
+  if (argc > 1) {
+    all_args.assign(argv + 1, argv + argc);
+  }
+
+  for (std::string filename : all_args) {
+    std::ifstream in_file;
+    in_file.open(filename);
+
+    if (!in_file.is_open()) {
+      std::cout << "Failed to open " << filename << ".\n";
+    } else {
+
+      unsigned n_moms = 5;
+      std::vector<double> o(n_moms);
+      std::vector<double> δo(n_moms);
+
+      uint64_t norm = 0;
+
+      uint64_t j = 0;
+      uint64_t a;
+
+      while (in_file >> a) {
+        norm += a;
+        for (unsigned i = 0; i < n_moms; i++) {
+          o[i] += a * pow(j + 1, i + 1);
+          δo[i] += a * pow(j + 1, 2 * (i + 1));
+        }
+        j++;
+      }
+
+      in_file.close();
+
+      for (unsigned i = 0; i < n_moms; i++) {
+        o[i] /= norm;
+        δo[i] = sqrt(δo[i]) / norm;
+      }
+
+      std::ofstream out_file;
+      out_file.open(filename + ".processed");
+
+      for (unsigned i = 0; i < n_moms; i++) {
+        out_file << o[i] << " " << δo[i] << "\n";
+      }
+
+      out_file.close();
+
+      std::cout << "Finished processing " << filename << ".\n";
+    }
+  }
+
+  return 0;
+}
-- 
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