Move library tree where it belongs

lib-src/libscorealign/regression.h

@@ -0,0 +1,29 @@
+// Regression is a class to compute a linear regression
+// 
+// call point(x, y) to add a data point
+// call regress() to compute the regression
+// call f(x) to evaluate the linear regression at x
+// call f_inv(y) to evaluate the inverse linear regression at y
+// to restart with new points, call init()
+// regress() can be called after each point()
+//
+// other forms of regression should be added. This one does
+// standard least squares regression
+
+class Regression {
+    float sumxx; // sum of x^2
+    float sumyy; // sum of y^2
+    float sumxy; // sum of xy
+    float sumx;  // sum of x
+    float sumy;  // sum of y
+    int n;       // number of points
+    float a, b;  // regression line is a + b*x
+ public:
+    Regression();
+    void init();
+    void point(float x, float y);
+    void regress();
+    float f(float x);
+    float f_inv(float y);
+};
+