From 2355b010723d5479f71f8c02dac752fbbd03ebfa Mon Sep 17 00:00:00 2001
From: Samuel Fadel <samuelfadel@gmail.com>
Date: Wed, 20 Jan 2016 10:32:19 +0100
Subject: main(): better code for loading CP data.

---
 main.cpp | 52 ++++++++++++++++++++++++++++++----------------------
 1 file changed, 30 insertions(+), 22 deletions(-)

(limited to 'main.cpp')

diff --git a/main.cpp b/main.cpp
index febeea2..45fef63 100644
--- a/main.cpp
+++ b/main.cpp
@@ -28,6 +28,12 @@ static QObject *mainProvider(QQmlEngine *engine, QJSEngine *scriptEngine)
     return Main::instance();
 }
 
+arma::uvec extractCPs(const arma::mat &X)
+{
+    int numCPs = (int) (3 * sqrt(X.n_rows));
+    return arma::randi<arma::uvec>(numCPs, arma::distr_param(0, X.n_rows - 1));
+}
+
 int main(int argc, char **argv)
 {
     QApplication app(argc, argv);
@@ -61,36 +67,38 @@ int main(int argc, char **argv)
     arma::mat X = m->X();
     arma::vec labels = m->labels();
 
-    arma::uword n = X.n_rows;
-    int cpSize;
     arma::uvec cpIndices;
     arma::mat Ys;
 
+    QString indicesFilename;
     if (parser.isSet(indicesFileOutputOption)) {
-        const QString &indicesFilename = parser.value(indicesFileOutputOption);
+        indicesFilename = parser.value(indicesFileOutputOption);
+    }
+    QFile indicesFile(indicesFilename);
+    if (indicesFile.exists()) {
         m->setIndicesSavePath(indicesFilename);
-        QFile indicesFile(indicesFilename);
-        if (indicesFile.exists()) {
-            cpIndices.load(indicesFilename.toStdString(), arma::raw_ascii);
-            cpSize = cpIndices.n_elem;
-        } else {
-            cpSize = (int) (3 * sqrt(n));
-            // cpIndices = relevanceSampling(X, cpSize);
-            cpIndices = arma::randi<arma::uvec>(cpSize, arma::distr_param(0, n-1));
-        }
-
-        arma::sort(cpIndices);
+        cpIndices.load(indicesFilename.toStdString(), arma::raw_ascii);
+    } else {
+        cpIndices = extractCPs(X);
     }
+
+    arma::sort(cpIndices);
+
+    QString cpFilename;
     if (parser.isSet(cpFileOutputOption)) {
-        const QString &cpFilename = parser.value(cpFileOutputOption);
+        cpFilename = parser.value(cpFileOutputOption);
+    }
+    QFile cpFile(cpFilename);
+    if (cpFile.exists()) {
         m->setCPSavePath(cpFilename);
-        QFile cpFile(cpFilename);
-        if (cpFile.exists()) {
-            Ys.load(cpFilename.toStdString(), arma::raw_ascii);
-        } else {
-            Ys.set_size(cpSize, 2);
-            mp::forceScheme(mp::dist(X.rows(cpIndices)), Ys);
-        }
+        Ys.load(cpFilename.toStdString(), arma::raw_ascii);
+    } else {
+        Ys.set_size(cpIndices.n_elem, 2);
+        mp::forceScheme(mp::dist(X.rows(cpIndices)), Ys);
+    }
+    if (cpIndices.n_elem != Ys.n_rows) {
+        std::cerr << "The number of CP indices and the CP map do not match." << std::endl;
+        return 1;
     }
 
     m->setCPIndices(cpIndices);
-- 
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