diff --git a/Cartesian.cpp b/Cartesian.cpp
index c75e27a..8775c5a 100644
--- a/Cartesian.cpp
+++ b/Cartesian.cpp
@@ -176,6 +176,22 @@ int Cartesian::invert(int a) { return -a; }
 
 double Cartesian::invert(double aa) { return -aa; }
 
+void Cartesian::transpose(void) {
+	double zz = 0.0;
+	zz = xx;
+	xx = yy;
+	yy = zz;
+	concordanceDouble();
+	return; }
+
+Cartesian Cartesian::transpose(Cartesian carte) {
+	double zz = 0.0;
+	zz = carte.xx;
+	carte.xx = carte.yy;
+	carte.yy = zz;
+	carte.concordanceDouble();
+	return carte; }
+
 double Cartesian::distanceDouble(void) {
 	double dd = sqrt((xx * xx) + (yy * yy));
 	if ((xx < 0) && (yy > 0)) dd = -dd;
diff --git a/Cartesian.hpp b/Cartesian.hpp
index 7480b6d..1371cc4 100644
--- a/Cartesian.hpp
+++ b/Cartesian.hpp
@@ -77,6 +77,10 @@ class Cartesian
 		int invert(int a);
 		double invert(double aa);
 		
+		// Transpose x coordinate and y coordinate
+		void transpose(void);
+		Cartesian transpose(Cartesian carte);
+		
 		// Calculate distance from current position to...
 		int distanceInt(void);            // origin
 		double distanceDouble(void);