June 2018 Update

Task/Ranking-methods/D/ranking-methods.d

@@ -0,0 +1,167 @@
+import std.algorithm;
+import std.stdio;
+
+void main() {
+    immutable scores = [
+        "Solomon": 44,
+        "Jason": 42,
+        "Errol": 42,
+        "Garry": 41,
+        "Bernard": 41,
+        "Barry": 41,
+        "Stephen": 39
+    ];
+
+    scores.standardRank;
+    scores.modifiedRank;
+    scores.denseRank;
+    scores.ordinalRank;
+    scores.fractionalRank;
+}
+
+/*
+Standard ranking
+1 44 Solomon
+2 42 Jason
+2 42 Errol
+4 41 Garry
+4 41 Bernard
+4 41 Barry
+7 39 Stephen
+*/
+void standardRank(const int[string] data) {
+    writeln("Standard Rank");
+
+    int rank = 1;
+    foreach (value; data.values.dup.sort!"a>b".uniq) {
+        int temp = rank;
+        foreach(k,v; data) {
+            if (v==value) {
+                writeln(temp, " ", v, " ", k);
+                rank++;
+            }
+        }
+    }
+
+    writeln;
+}
+
+/*
+Modified ranking
+1 44 Solomon
+3 42 Jason
+3 42 Errol
+6 41 Garry
+6 41 Bernard
+6 41 Barry
+7 39 Stephen
+*/
+void modifiedRank(const int[string] data) {
+    writeln("Modified Rank");
+
+    int rank = 0;
+    foreach (value; data.values.dup.sort!"a>b".uniq) {
+        foreach(k,v; data) {
+            if (v==value) {
+                rank++;
+            }
+        }
+        foreach(k,v; data) {
+            if (v==value) {
+                writeln(rank, " ", v, " ", k);
+            }
+        }
+    }
+
+    writeln;
+}
+
+/*
+Dense ranking
+1 44 Solomon
+2 42 Jason
+2 42 Errol
+3 41 Garry
+3 41 Bernard
+3 41 Barry
+4 39 Stephen
+*/
+void denseRank(const int[string] data) {
+    writeln("Dense Rank");
+
+    int rank = 1;
+    foreach (value; data.values.dup.sort!"a>b".uniq) {
+        foreach(k,v; data) {
+            if (v==value) {
+                writeln(rank, " ", v, " ", k);
+            }
+        }
+        rank++;
+    }
+
+    writeln;
+}
+
+/*
+Ordinal ranking
+1 44 Solomon
+2 42 Jason
+3 42 Errol
+4 41 Garry
+5 41 Bernard
+6 41 Barry
+7 39 Stephen
+*/
+void ordinalRank(const int[string] data) {
+    writeln("Ordinal Rank");
+
+    int rank = 1;
+    foreach (value; data.values.dup.sort!"a>b".uniq) {
+        foreach(k,v; data) {
+            if (v==value) {
+                writeln(rank, " ", v, " ", k);
+                rank++;
+            }
+        }
+    }
+
+    writeln;
+}
+
+/*
+Fractional ranking
+1,0 44 Solomon
+2,5 42 Jason
+2,5 42 Errol
+5,0 41 Garry
+5,0 41 Bernard
+5,0 41 Barry
+7,0 39 Stephen
+*/
+void fractionalRank(const int[string] data) {
+    writeln("Fractional Rank");
+
+    int rank = 0;
+    foreach (value; data.values.dup.sort!"a>b".uniq) {
+        real avg = 0;
+        int cnt;
+
+        foreach(k,v; data) {
+            if (v==value) {
+                rank++;
+                cnt++;
+                avg+=rank;
+            }
+        }
+        avg /= cnt;
+
+        foreach(k,v; data) {
+            if (v==value) {
+                writef("%0.1f ", avg);
+                writeln(v, " ", k);
+            }
+        }
+    }
+
+    writeln;
+}