From: fred <fred>
Date: Thu, 3 Oct 1996 19:01:51 +0000 (+0000)
Subject: flower-1.0.2
X-Git-Tag: release/1.5.59~7175
X-Git-Url: https://git.donarmstrong.com/?a=commitdiff_plain;h=c0d86ca833b66316605906d000bf96ec44732bbb;p=lilypond.git

flower-1.0.2
---

diff --git a/flower/matrix.hh b/flower/matrix.hh
new file mode 100644
index 0000000000..e092a5fbe6
--- /dev/null
+++ b/flower/matrix.hh
@@ -0,0 +1,141 @@
+#ifndef MATRIX_HH
+#define MATRIX_HH
+
+
+#include "vsmat.hh"
+#include "vector.hh"
+
+/// a Real matrix
+class Matrix {
+    virtual_smat *dat;
+    
+public:
+    void OK() const { dat->OK(); }
+    int cols() const { return dat->cols(); }
+    int rows() const { return dat->rows(); }
+
+    /// return the size of a matrix
+    int dim() const;
+    /**
+      PRE
+      the matrix needs to be square.
+    */
+     
+    // Matrix() { dat = 0; } 
+    ~Matrix() { delete dat; }
+
+    /// set entries to r 
+    void fill(Real r);
+
+    /// set diagonal to d
+    void set_diag(Real d);
+
+    void set_diag(Vector d);
+    /// set unit matrix
+    void unit() { set_diag(1.0); }
+
+    void operator+=(const Matrix&m);
+        void operator-=(const Matrix&m);    
+    void operator*=(Real a);
+    void operator/=(Real a) { (*this) *= 1/a; }
+    
+    /// add a row
+    void insert_row(Vector v,int k);
+    /**
+      add a row to the matrix before  row k
+
+      PRE
+      v.dim() == cols()
+      0 <= k <= rows()
+    */
+    ///
+    void delete_row(int k) { dat->delete_row(k); }
+    /**
+      delete a row from this matrix.
+
+      PRE
+      0 <= k < rows();
+    */
+    void delete_column(int k) { dat->delete_column(k); }
+    ///
+    Matrix(int n);
+    /**
+      square n matrix, initialised to null
+    */
+    ///
+    Matrix(int n, int m);
+    /**
+      n x m matrix, init to 0
+    */
+    Matrix(const Matrix &m);
+
+    /// dyadic product: v * w.transpose
+    Matrix(Vector v, Vector w);
+    void operator=(const Matrix&m);
+
+    /// access an element
+    Real operator()(int i,int j) const;
+
+    /// access an element
+    Real &operator()(int i, int j);
+
+    /// Matrix multiply with vec (from right)
+    Vector operator *(const Vector &v) const;
+
+    /// set this to m1*m2.
+    void set_product(const Matrix &m1, const Matrix &m2);
+
+
+    Vector left_multiply(Vector const &) const;
+    
+    Matrix operator-() const;
+    
+    /// transpose this.
+    void transpose();
+    
+    /// return a transposed copy.
+    Matrix transposed() const ;
+
+    Real norm() const;
+    /// swap
+    void swap_columns(int c1, int c2);
+    /**
+      PRE
+      0 <= c1,c2 < cols()
+    */
+
+    /// swap
+    void swap_rows(int c1, int c2);
+    /**
+      PRE
+      0 <= c1,c2 < rows()
+    */
+
+
+    Vector row(int ) const;
+    Vector col(int) const;
+
+    operator String() const;
+    void print() const;
+};
+
+/** This is a class for a nonsquare block of #Real#s.  The
+    implementation of sparse matrices is done in the appropriate #smat#
+    class. Matrix only does the mathematical actions (adding,
+    multiplying, etc.)
+
+    
+    TODO
+    implement ref counting?  */
+
+
+inline Vector
+operator *(Vector &v, const Matrix& m) { return m.left_multiply(v); }
+Matrix operator *(const Matrix& m1,const Matrix &m2);
+Matrix operator /(const Matrix &m1,Real a);
+inline Matrix operator -(Matrix m1,const Matrix m2)
+{
+    m1 -= m2;
+    return m1;
+}
+#endif