Add random value generators

src/net/apocalypselabs/symat/Functions.java

@@ -52,6 +52,7 @@ import java.io.InputStreamReader;
 import static java.lang.Math.*;
 import java.lang.reflect.Array;
 import java.net.URL;
+import java.security.SecureRandom;
 import java.util.Arrays;
 import java.util.Calendar;
 import java.util.Date;
@@ -83,6 +84,8 @@ public class Functions {
 
     private String lang = "py";
 
+    private SecureRandom rng = new SecureRandom();
+
     /*
      Useful interactions
      */
@@ -301,22 +304,52 @@ public class Functions {
 
     /**
      * Get all unique permutations of the given array.
+     *
      * @param objs Array of items.
      * @return Matrix
      */
     public Object[] perms(Object... objs) {
         Permutations<Object> perm = new Permutations<>(objs);
-        
+
         Set perms = new HashSet<>();
-        
+
         while (perm.hasNext()) {
             perms.add(perm.next());
         }
-        
+
         Object[][] a = new Object[perms.size()][objs.length];
         return perms.toArray(a);
     }
 
+    /**
+     * Get a uniform random fraction between 0.0 (inclusive) and 1.0
+     * (exclusive).
+     *
+     * @return random fraction
+     */
+    public double rand() {
+        return rng.nextDouble();
+    }
+
+    /**
+     * Get a random boolean value.
+     * @return true or false
+     */
+    public boolean randb() {
+        return rng.nextBoolean();
+    }
+
+    /**
+     * Get a uniform random integer.
+     *
+     * @param min Minimum value, inclusive
+     * @param max Maximum value, inclusive
+     * @return random integer
+     */
+    public int rand(int min, int max) {
+        return rng.nextInt((max - min) + 1) + min;
+    }
+
     /**
      * Multiply two matrices.
      *

src/net/apocalypselabs/symat/functions.py

@@ -47,4 +47,10 @@ def times(*a):
 def divide(*a):
     return _.divide(a)
 def mod(*a):
-    return _.mod(a)
+    return _.mod(a)
+def rand():
+    return _.rand()
+def rand(min,max):
+    return _.rand(min,max)
+def randb():
+    return _.randb()

src/net/apocalypselabs/symat/resources/jsfunctions.txt

@@ -16,6 +16,14 @@ plotclr()|Reset the graph.
 drawdot(x, y)|Places a dot at the given coordinates.
 readfile("")|Read a text file from the given filename.
 savefile(data,"")|Save the text data to a file.
+rand()|Random fraction from 0 (inclusive) to 1 (exclusive)
+rand(min,max)|Random number between min and max, inclusive
+randb()|Random boolean (true or false)
+add(n1,n2,...)|Add the given numbers.
+subtract(n1,n2,...)|Subtract the given numbers.
+times(n1,n2,...)|Multiply the given numbers.
+divide(n1,n2,...)|Divide the given numbers.
+mod(n1,n2,...)|Divide the numbers and return the remainder.
 abs(0)|Absolute value of number.
 asin(0)|
 acos(0)|

src/net/apocalypselabs/symat/resources/pyfunctions.txt

@@ -15,6 +15,14 @@ drawdot(x, y)|Places a dot at the given coordinates.
 simplify('')|Simplify the given function.
 readfile("")|Read a text file from the given filename.
 savefile(data,"")|Save the text data to a file.
+rand()|Random fraction from 0 (inclusive) to 1 (exclusive)
+rand(min,max)|Random number between min and max, inclusive
+randb()|Random boolean (true or false)
+add(n1,n2,...)|Add the given numbers.
+subtract(n1,n2,...)|Subtract the given numbers.
+times(n1,n2,...)|Multiply the given numbers.
+divide(n1,n2,...)|Divide the given numbers.
+mod(n1,n2,...)|Divide the numbers and return the remainder.
 vpa('')|Computes numerical value or simplifies.
 fabs(0)|Absolute value of number.
 asin(0)|