There is now a verbose mode for Q1 and Q3.

README.md

@@ -3,4 +3,10 @@ MMMCalc
 
 This is a very simple project, it was made for educational purposes (hence why it is open-source), and I encourage everyone to contribute if they have something to add.
 
+The most simple way to build this project is to move to the src folder/directory and run
+
+	$ javac MMMCalc.java
+
+This will allow you to build the project that should work properly if you are downloading one of the releases (if you download the straight from the master branch it might have some problems).
+
 To contact me, send me an e-mail at <nicolas.ortega.froysa@gmail.com>.

src/MMMCalc.java

@@ -1,3 +1,5 @@
+import java.lang.Math;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -9,41 +11,107 @@ import java.util.Map;
  * 
  */
 public class MMMCalc {
+	private static boolean verbose = false;
 	private static float[] numArray;
+	private static float mean = 0;
+	private static float q1 = 0;
+	private static float median = 0;
+	private static float q3 = 0;
+	private static float mode = 0;
+	private static float range = 0;
+	private static float stdDev = 0;
+	private static float variance = 0;
 
 	public static void main(String[] args) {
-		System.out.println("Welcome to MMMCalc v0.1, a simple tool for basic statistics calculations.\n" +
-			"This software is licensed under the GNU GPLv3 license and comes WITHOUT WARRANTY.\n");
+		System.out.println("MMMCalc v0.2, Copyright (C) 2014 Nicolás A. Ortega\n" +
+					"This program comes with ABSOLUTELY NO WARRANTY; for details use '-w'\n" +
+					"This is free software, and you are welcome to redistribute it\n" +
+					"under certain conditions; use '-c' for details.\n");
 		if(args.length > 0) {
-			float sNum = 0;
-			numArray = new float[args.length];
+			if(args[0].equals("-h")) {
+				System.out.println("Usage:\n" +
+					"  MMMCalc [options] [variables]\n\n" +
+					"Options:\n" +
+					"  -v | -V -- Be verbose (show the work).\n" +
+					"  -w -- Show warranty information.\n" +
+					"  -c -- Show copyright information.\n" +
+					"  -h -- Show this help information.\n");
+			} else if(args[0].equals("-w")) {
+				System.out.println("THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY\n" +
+					"APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT\n" +
+					"HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM 'AS IS' WITHOUT WARRANTY\n" +
+					"OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,\n" +
+					"THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR\n" +
+					"PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM\n" +
+					"IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF\n" +
+					"ALL NECESSARY SERVICING, REPAIR OR CORRECTION.\n");
+			} else if(args[0].equals("-c")) {
+				System.out.println("MMMCalc, a very basic statistics calculator.\n" +
+					"Copyright (C) 2014 Nicolás A. Ortega\n\n" +
+					"This program is free software: you can redistribute it and/or modify\n" +
+					"it under the terms of the GNU General Public License as published by\n" +
+					"the Free Software Foundation, either version 3 of the License, or\n" +
+					"(at your option) any later version.\n\n" +
+					"This program is distributed in the hope that it will be useful,\n" +
+					"but WITHOUT ANY WARRANTY; without even the implied warranty of\n" +
+					"MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n" +
+					"GNU General Public License for more details.\n\n" +
+					"You should have received a copy of the GNU General Public License\n" +
+					"along with this program.  If not, see <www.gnu.org/licenses/>.");
+			} else if(args[0].equals("-v") || args[0].equals("-V")) {
+				verbose = true;
+				numArray = new float[args.length - 1];
 
-			for(int i = 0; i < args.length; i++) {
-				numArray[i] = Float.parseFloat(args[i]) - 0f;
+				for(int i = 0; i < numArray.length; i++) {
+					numArray[i] = Float.parseFloat(args[i+1]);
+				}
+				sortArray();
+
+				calcMean();
+				calcQ1();
+				calcMedian();
+				calcQ3();
+				calcMode();
+				calcRange();
+				calcStdDev();
+				calcVariance();
+			} else {
+				numArray = new float[args.length];
+
+				for(int i = 0; i < args.length; i++) {
+					numArray[i] = Float.parseFloat(args[i]) - 0f;
+				}
+				sortArray();
+
+				calcMean();
+				calcQ1();
+				calcMedian();
+				calcQ3();
+				calcMode();
+				calcRange();
+				calcStdDev();
+				calcVariance();
 			}
+		} else {
+			System.out.println("You did not mention any variables. Use the -h argument for help.");
+		}
+	}
 
-			int nL = numArray.length;
-			float tmp = 0;
-			for(int i = 0; i < nL; i++) {
-				for(int j = 0; j >= (i+1); j--) {
-					if(numArray[j] < numArray[j-1]) {
-						tmp = numArray[j];
-						numArray[j] = numArray[j-1];
-						numArray[j-1] = tmp;
-					}
+	private static void sortArray() {
+		int nL = numArray.length;
+		float tmp = 0;
+		for(int i = 0; i < nL; i++) {
+			for(int j = (nL-1); j >= (i+1); j--) {
+				if(numArray[j] < numArray[j-1]) {
+					tmp = numArray[j];
+					numArray[j] = numArray[j-1];
+					numArray[j-1] = tmp;
 				}
 			}
-
-			calcMean();
-			calcMedian();
-			calcMode();
-		} else {
-			System.out.println("You did not mention any variables.");
 		}
 	}
 
 	private static void calcMean() {
-		float mean = 0;
 		float sum = 0;
 
 		for(float i: numArray) {
@@ -53,14 +121,125 @@ public class MMMCalc {
 		mean = sum / (float)numArray.length;
 
 		System.out.println("Mean: " + mean);
+
+		if(verbose) {
+			System.out.print("(");
+			for(int i = 0; i < numArray.length; i++) {
+				System.out.print(numArray[i]);
+				if(i != numArray.length -1) {
+					System.out.print(" + ");
+				}
+			}
+			System.out.print(") / " + numArray.length + " = " + mean + "\n\n");
+		}
+	}
+
+	private static void calcQ1() {
+		int q1Pos = numArray.length / 4;
+		boolean exact;
+
+		if(numArray.length % 4 == 0) {
+			q1 = (numArray[q1Pos] + numArray[q1Pos-1]) / 2;
+			exact = false;
+		} else {
+			q1 = numArray[q1Pos];
+			exact = true;
+		}
+
+		System.out.println("Q1: " + q1);
+
+		if(verbose) {
+			for(int i = 0; i < numArray.length; i++) {
+				if(!exact) {
+					if(i == q1Pos - 1) {
+						System.out.print(">>" + numArray[i] + " !" + q1 + "! ");
+					} else if( i == q1Pos) {
+						System.out.print(numArray[i] + "<< ");
+					} else {
+						System.out.print(numArray[i] + " ");
+					}
+				} else {
+					if(i == q1Pos) {
+						System.out.print(">>" + numArray[i] + "<< ");
+					} else {
+						System.out.print(numArray[i] + " ");
+					}
+				}
+			}
+			System.out.print("\n\n");
+		}
 	}
 
 	private static void calcMedian() {
-		int midVar = 0;
+		int midVar = numArray.length / 2;
+		boolean exact;
 
-		midVar = numArray.length / 2;
+		if(numArray.length % 2 == 0) {
+			median = (numArray[midVar] + numArray[midVar-1]) / 2;
+			exact = false;
+		} else {
+			median = numArray[midVar];
+			exact = true;
+		}
 
-		System.out.println("Median: " + numArray[midVar]);
+		System.out.println("Median: " + median);
+
+		if(verbose) {
+			for(int i = 0; i < numArray.length; i++) {
+				if(!exact) {
+					if(i == midVar - 1) {
+						System.out.print(">>" + numArray[i] + " !" + median + "! ");
+					} else if(i == midVar) {
+						System.out.print(numArray[i] + "<< ");
+					} else {
+						System.out.print(numArray[i] + " ");
+					}
+				} else {
+					if(i == midVar) {
+						System.out.print(">>" + numArray[i] + "<< ");
+					} else {
+						System.out.print(numArray[i] + " ");
+					}
+				}
+			}
+			System.out.print("\n\n");
+		}
+	}
+
+	private static void calcQ3() {
+		int q3Pos = (numArray.length * 3) / 4;
+		boolean exact;
+
+		if((numArray.length * 3) % 4 == 0) {
+			q3 = (numArray[q3Pos] + numArray[q3Pos-1]) / 2;
+			exact = false;
+		} else {
+			q3 = numArray[q3Pos];
+			exact = true;
+		}
+
+		System.out.println("Q3: " + q3);
+
+		if(verbose) {
+			for(int i = 0; i < numArray.length; i++) {
+				if(!exact) {
+					if(i == q3Pos - 1) {
+						System.out.print(">>" + numArray[i] + " !" + q3 + "! ");
+					} else if(i == q3Pos) {
+						System.out.print(numArray[i] + "<< ");
+					} else {
+						System.out.print(numArray[i] + " ");
+					}
+				} else {
+					if(i == q3Pos) {
+						System.out.print(">>" + numArray[i] + "<< ");
+					} else {
+						System.out.print(numArray[i] + " ");
+					}
+				}
+			}
+			System.out.print("\n\n");
+		}
 	}
 
 	private static void calcMode() {
@@ -75,7 +254,6 @@ public class MMMCalc {
 			}
 		}
 
-		float mode = 0;
 		float modeFreq = 0;
 
 		for(Map.Entry<Float, Float> entry: fx.entrySet()) {
@@ -87,5 +265,56 @@ public class MMMCalc {
 		}
 
 		System.out.println("Mode: " + mode + " (frequency: " + modeFreq + ")");
+
+		if(verbose) {
+			for(Map.Entry<Float, Float> entry:fx.entrySet()) {
+				System.out.print(entry.getKey() + "(" + entry.getValue() + ") ");
+			}
+			System.out.print("\n\n");
+		}
+	}
+
+	private static void calcRange() {
+		int l = numArray.length -1;
+		range = numArray[l] - numArray[0];
+
+		System.out.println("Range: " + range);
+
+		if(verbose) {
+			System.out.println(numArray[l] + " - " + numArray[0] + " = " + range + "\n");
+		}
+	}
+
+	private static void calcStdDev() {
+		float difSum = 0;
+		for(int i = 0; i < numArray.length; i++) {
+			difSum += numArray[i] - mean;
+		}
+
+		stdDev = difSum / (float)Math.sqrt((double)numArray.length);
+
+		System.out.println("Standard Deviation: " + stdDev);
+
+		if(verbose) {
+			System.out.print("sqrt((");
+			for(int i = 0; i < numArray.length; i++) {
+				System.out.print(numArray[i] + " - " + mean);
+				if(i != numArray.length - 1) {
+					System.out.print(" + ");
+				}
+			}
+			System.out.print(")^2 / " + numArray.length + ") = " + stdDev + "\n\n");
+		}
+	}
+
+	private static void calcVariance() {
+		// NOTE: I'm doing it this way so I don't have to convert the variables to doubles and lose precision.
+		variance = stdDev * stdDev;
+
+		System.out.println("Variance: " + variance);
+
+		if(verbose) {
+			System.out.println(stdDev + "^2 = " + variance + "\n");
+		}
 	}
 }

src/manifest.mf

@@ -1,2 +1,2 @@
-Manifest-Version: 0.1
+Manifest-Version: 0.2
 Main-Class: MMMCalc