Index: src/OFFloatVector.h
==================================================================
--- src/OFFloatVector.h
+++ src/OFFloatVector.h
@@ -16,10 +16,12 @@
 
 #include <stdarg.h>
 
 #import "OFObject.h"
 
+@class OFFloatMatrix;
+
 /**
  * \brief A class for storing and manipulating vectors of floats.
  */
 @interface OFFloatVector: OFObject <OFCopying>
 {
@@ -162,6 +164,14 @@
 
 /**
  * \brief Normalizes the vector.
  */
 - (void)normalize;
+
+/**
+ * \brief Multiplies the receiver with the specified matrix on the left side and
+ *	  the receiver on the right side.
+ *
+ * \param matrix The matrix to multiply the receiver with
+ */
+- (void)multiplyWithMatrix: (OFFloatMatrix*)matrix;
 @end

Index: src/OFFloatVector.m
==================================================================
--- src/OFFloatVector.m
+++ src/OFFloatVector.m
@@ -18,10 +18,11 @@
 
 #include <string.h>
 #include <math.h>
 
 #import "OFFloatVector.h"
+#import "OFFloatMatrix.h"
 #import "OFString.h"
 
 #import "OFInvalidArgumentException.h"
 #import "OFNotImplementedException.h"
 #import "OFOutOfRangeException.h"
@@ -315,6 +316,40 @@
 	magnitude = [self magnitude];
 
 	for (i = 0; i < dimension; i++)
 		data[i] /= magnitude;
 }
+
+- (void)multiplyWithMatrix: (OFFloatMatrix*)matrix
+{
+	size_t rows, columns;
+	float *cArray, *newData;
+	size_t i, j, k;
+
+	columns = [matrix columns];
+
+	if (dimension != columns)
+		@throw [OFInvalidArgumentException newWithClass: isa
+						       selector: _cmd];
+
+	rows = [matrix rows];
+	cArray = [matrix cArray];
+
+	newData = [self allocMemoryForNItems: rows
+				    withSize: sizeof(float)];
+	memset(newData, 0, rows * sizeof(float));
+
+	for (i = j = k = 0; i < rows * columns; i++) {
+		newData[j] += cArray[i] * data[k];
+
+		if (++j == rows) {
+			k++;
+			j = 0;
+		}
+	}
+
+	[self freeMemory: data];
+	data = newData;
+
+	dimension = rows;
+}
 @end