Added is_consistent()

arrays.scad

@@ -89,6 +89,20 @@ function slice(arr,st,end) = let(
 function in_list(x,l,idx=undef) = search([x], l, num_returns_per_match=1, index_col_num=idx) != [[]];
 
 
+// Function: is_consistent()
+// Usage:
+//   is_consistent(v);
+// Description:
+//   Returns true if all items of the given list are the same size.
+// Example:
+//   is_consistent([3,4,5,6]);  // Returns: true
+//   is_consistent([[3,4],[4,5],[5,6]]);  // Returns: true
+//   is_consistent([[3,4,5],[4,5,6],[5,6,7]]);  // Returns: true
+//   is_consistent([[3,4,5],[4,5],[5,6,7]]);  // Returns: false
+//   is_consistent([[3,4,5],[4,undef,6],[5,6,7]]);  // Returns: false
+function is_consistent(v) = v==[] || is_list_of(v, v[0]);
+
+
 // Function: min_index()
 // Usage:
 //   min_index(vals,[all]);

version.scad

@@ -8,7 +8,7 @@
 //////////////////////////////////////////////////////////////////////
 
 
-BOSL_VERSION = [2,0,146];
+BOSL_VERSION = [2,0,147];
 
 
 // Section: BOSL Library Version Functions