@@ -14,7 +14,7 @@ var slice = Array..slice,
 descNum = function( a, b ) { return b - a; },
 
 // test if array
-isArray = function( arg ) {
+isArray = Array.isArray || function( arg ) {
 return toString.call( arg ) === "[object Array]";
 },
 
@@ -63,15 +63,15 @@ jStat.fn = jStat. = {
 if ( isArray( args[0] )) {
 if ( isArray( args[0][0] )) {
 for ( var i = 0; i < args[0].length; i++ ) {
-this.push( args[0][i] );
+this[i] = args[0][i];
 }
 } else {
-this.push( args[0] );
+this[0] = args[0];
 }
 
 // if first argument is number, assume creation of sequence
 } else if ( !isNaN( args[0] )) {
-this.push( jStat.seq.apply( null, args ));
+this[0] = jStat.seq.apply( null, args );
 }
 return this;
 },
@@ -244,18 +244,12 @@ jStat.extend({
 
 // map a function to a matrix or vector
 map : function( arr, func, toAlter ) {
-arr = isArray( arr[0] ) ? arr : [ arr ];
-var row = 0,
-nrow = arr.length,
-ncol = arr[0].length,
+var len = arr.length,
 res = toAlter ? arr : [],
-col;
-for ( ; row < nrow; row++ ) {
-res[row] = res[row] || [];
-for ( col = 0; col < ncol; col++ ) {
-res[row][col] = func( arr[row][col], row, col );
-}
-}
+i = 0;
+for ( ; i < len; i++ )
+if ( isArray( arr[i] )) res[i] = jStat.map( arr[i], func, toAlter );
+else res[i] = func( arr[i], i, arr );
 return res;
 },