matrix_dense_int_math.go

/* -*- mode: go; -*-
 *
 * Copyright (C) 2015-2020 Philipp Benner
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
/* -------------------------------------------------------------------------- */
/* -------------------------------------------------------------------------- */
package autodiff
/* -------------------------------------------------------------------------- */
//import "fmt"
/* -------------------------------------------------------------------------- */
// True if matrix a equals b.
func (a *DenseIntMatrix) Equals(b ConstMatrix, epsilon float64) bool {
  n1, m1 := a.Dims()
  n2, m2 := b.Dims()
  if n1 != n2 || m1 != m2 {
    panic("MEqual(): matrix dimensions do not match!")
  }
  for i := 0; i < n1; i++ {
    for j := 0; j < m1; j++ {
      if !a.ConstAt(i, j).Equals(b.ConstAt(i, j), epsilon) {
        return false
      }
    }
  }
  return true
}
func (a *DenseIntMatrix) EQUALS(b *DenseIntMatrix, epsilon float64) bool {
  n1, m1 := a.Dims()
  n2, m2 := b.Dims()
  if n1 != n2 || m1 != m2 {
    panic("MEqual(): matrix dimensions do not match!")
  }
  for i := 0; i < n1; i++ {
    for j := 0; j < m1; j++ {
      if !a.AT(i, j).EQUALS(b.AT(i, j), epsilon) {
        return false
      }
    }
  }
  return true
}
/* -------------------------------------------------------------------------- */
// Element-wise addition of two matrices. The result is stored in r.
func (r *DenseIntMatrix) MaddM(a, b ConstMatrix) Matrix {
  n, m := r.Dims()
  n1, m1 := a.Dims()
  n2, m2 := b.Dims()
  if n1 != n || m1 != m || n2 != n || m2 != m {
    panic("matrix dimensions do not match!")
  }
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.At(i, j).Add(a.ConstAt(i, j), b.ConstAt(i, j))
    }
  }
  return r
}
func (r *DenseIntMatrix) MADDM(a, b *DenseIntMatrix) Matrix {
  n, m := r.Dims()
  n1, m1 := a.Dims()
  n2, m2 := b.Dims()
  if n1 != n || m1 != m || n2 != n || m2 != m {
    panic("matrix dimensions do not match!")
  }
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.AT(i, j).ADD(a.AT(i, j), b.AT(i, j))
    }
  }
  return r
}
/* -------------------------------------------------------------------------- */
// Add scalar b to all elements of a. The result is stored in r.
func (r *DenseIntMatrix) MaddS(a ConstMatrix, b ConstScalar) Matrix {
  n, m := r.Dims()
  n1, m1 := a.Dims()
  if n1 != n || m1 != m {
    panic("matrix dimensions do not match!")
  }
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.At(i, j).Add(a.ConstAt(i, j), b)
    }
  }
  return r
}
func (r *DenseIntMatrix) MADDS(a *DenseIntMatrix, b Int) Matrix {
  n, m := r.Dims()
  n1, m1 := a.Dims()
  if n1 != n || m1 != m {
    panic("matrix dimensions do not match!")
  }
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.AT(i, j).ADD(a.AT(i, j), b)
    }
  }
  return r
}
/* -------------------------------------------------------------------------- */
// Element-wise substraction of two matrices. The result is stored in r.
func (r *DenseIntMatrix) MsubM(a, b ConstMatrix) Matrix {
  n, m := r.Dims()
  n1, m1 := a.Dims()
  n2, m2 := b.Dims()
  if n1 != n || m1 != m || n2 != n || m2 != m {
    panic("matrix dimensions do not match!")
  }
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.At(i, j).Sub(a.ConstAt(i, j), b.ConstAt(i, j))
    }
  }
  return r
}
func (r *DenseIntMatrix) MSUBM(a, b *DenseIntMatrix) Matrix {
  n, m := r.Dims()
  n1, m1 := a.Dims()
  n2, m2 := b.Dims()
  if n1 != n || m1 != m || n2 != n || m2 != m {
    panic("matrix dimensions do not match!")
  }
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.AT(i, j).SUB(a.AT(i, j), b.AT(i, j))
    }
  }
  return r
}
/* -------------------------------------------------------------------------- */
// Substract b from all elements of a. The result is stored in r.
func (r *DenseIntMatrix) MsubS(a ConstMatrix, b ConstScalar) Matrix {
  n, m := r.Dims()
  n1, m1 := a.Dims()
  if n1 != n || m1 != m {
    panic("matrix dimensions do not match!")
  }
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.At(i, j).Sub(a.ConstAt(i, j), b)
    }
  }
  return r
}
func (r *DenseIntMatrix) MSUBS(a *DenseIntMatrix, b Int) Matrix {
  n, m := r.Dims()
  n1, m1 := a.Dims()
  if n1 != n || m1 != m {
    panic("matrix dimensions do not match!")
  }
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.AT(i, j).SUB(a.AT(i, j), b)
    }
  }
  return r
}
/* -------------------------------------------------------------------------- */
// Element-wise multiplication of two matrices. The result is stored in r.
func (r *DenseIntMatrix) MmulM(a, b ConstMatrix) Matrix {
  n, m := r.Dims()
  n1, m1 := a.Dims()
  n2, m2 := b.Dims()
  if n1 != n || m1 != m || n2 != n || m2 != m {
    panic("matrix dimensions do not match!")
  }
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.At(i, j).Mul(a.ConstAt(i, j), b.ConstAt(i, j))
    }
  }
  return r
}
func (r *DenseIntMatrix) MMULM(a, b *DenseIntMatrix) Matrix {
  n, m := r.Dims()
  n1, m1 := a.Dims()
  n2, m2 := b.Dims()
  if n1 != n || m1 != m || n2 != n || m2 != m {
    panic("matrix dimensions do not match!")
  }
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.AT(i, j).MUL(a.AT(i, j), b.AT(i, j))
    }
  }
  return r
}
/* -------------------------------------------------------------------------- */
// Multiply all elements of a with b. The result is stored in r.
func (r *DenseIntMatrix) MmulS(a ConstMatrix, b ConstScalar) Matrix {
  n, m := r.Dims()
  n1, m1 := a.Dims()
  if n1 != n || m1 != m {
    panic("matrix dimensions do not match!")
  }
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.At(i, j).Mul(a.ConstAt(i, j), b)
    }
  }
  return r
}
func (r *DenseIntMatrix) MMULS(a *DenseIntMatrix, b Int) Matrix {
  n, m := r.Dims()
  n1, m1 := a.Dims()
  if n1 != n || m1 != m {
    panic("matrix dimensions do not match!")
  }
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.AT(i, j).MUL(a.AT(i, j), b)
    }
  }
  return r
}
/* -------------------------------------------------------------------------- */
// Element-wise division of two matrices. The result is stored in r.
func (r *DenseIntMatrix) MdivM(a, b ConstMatrix) Matrix {
  n, m := r.Dims()
  n1, m1 := a.Dims()
  n2, m2 := b.Dims()
  if n1 != n || m1 != m || n2 != n || m2 != m {
    panic("matrix dimensions do not match!")
  }
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.At(i, j).Div(a.ConstAt(i, j), b.ConstAt(i, j))
    }
  }
  return r
}
func (r *DenseIntMatrix) MDIVM(a, b *DenseIntMatrix) Matrix {
  n, m := r.Dims()
  n1, m1 := a.Dims()
  n2, m2 := b.Dims()
  if n1 != n || m1 != m || n2 != n || m2 != m {
    panic("matrix dimensions do not match!")
  }
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.AT(i, j).DIV(a.AT(i, j), b.AT(i, j))
    }
  }
  return r
}
/* -------------------------------------------------------------------------- */
// Divide all elements of a by b. The result is stored in r.
func (r *DenseIntMatrix) MdivS(a ConstMatrix, b ConstScalar) Matrix {
  n, m := r.Dims()
  n1, m1 := a.Dims()
  if n1 != n || m1 != m {
    panic("matrix dimensions do not match!")
  }
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.At(i, j).Div(a.ConstAt(i, j), b)
    }
  }
  return r
}
func (r *DenseIntMatrix) MDIVS(a *DenseIntMatrix, b Int) Matrix {
  n, m := r.Dims()
  n1, m1 := a.Dims()
  if n1 != n || m1 != m {
    panic("matrix dimensions do not match!")
  }
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.AT(i, j).DIV(a.AT(i, j), b)
    }
  }
  return r
}
/* -------------------------------------------------------------------------- */
// Matrix product of a and b. The result is stored in r.
func (r *DenseIntMatrix) MdotM(a, b ConstMatrix) Matrix {
  n , m := r.Dims()
  n1, m1 := a.Dims()
  n2, m2 := b.Dims()
  if n1 != n || m2 != m || m1 != n2 {
    panic("matrix dimensions do not match!")
  }
  t1 := int(0)
  t2 := int(0)
  if r.storageLocation() == b.storageLocation() {
    t3 := make([]int, n)
    for j := 0; j < m; j++ {
      for i := 0; i < n; i++ {
        t2 = 0.0
        for k := 0; k < m1; k++ {
          t1 = a.ConstAt(i, k).GetInt()*b.ConstAt(k, j).GetInt()
          t2 = t2 + t1
        }
        t3[i] = t2
      }
      for i := 0; i < n; i++ {
        r.At(i, j).SetInt(t3[i])
      }
    }
  } else {
    t3 := make([]int, m)
    for i := 0; i < n; i++ {
      for j := 0; j < m; j++ {
        t2 = int(0)
        for k := 0; k < m1; k++ {
          t1 = a.ConstAt(i, k).GetInt()*b.ConstAt(k, j).GetInt()
          t2 = t2 + t1
        }
        t3[j] = t2
      }
      for j := 0; j < m; j++ {
        r.At(i, j).SetInt(t3[j])
      }
    }
  }
  return r
}
func (r *DenseIntMatrix) MDOTM(a, b *DenseIntMatrix) Matrix {
  n , m := r.Dims()
  n1, m1 := a.Dims()
  n2, m2 := b.Dims()
  if n1 != n || m2 != m || m1 != n2 {
    panic("matrix dimensions do not match!")
  }
  t1 := int(0)
  t2 := int(0)
  if r.storageLocation() == b.storageLocation() {
    t3 := make([]int, n)
    for j := 0; j < m; j++ {
      for i := 0; i < n; i++ {
        t2 = 0.0
        for k := 0; k < m1; k++ {
          t1 = a.AT(i, k).GetInt()*b.AT(k, j).GetInt()
          t2 = t2 + t1
        }
        t3[i] = t2
      }
      for i := 0; i < n; i++ {
        r.AT(i, j).SetInt(t3[i])
      }
    }
  } else {
    t3 := make([]int, m)
    for i := 0; i < n; i++ {
      for j := 0; j < m; j++ {
        t2 = int(0)
        for k := 0; k < m1; k++ {
          t1 = a.AT(i, k).GetInt()*b.AT(k, j).GetInt()
          t2 = t2 + t1
        }
        t3[j] = t2
      }
      for j := 0; j < m; j++ {
        r.AT(i, j).SetInt(t3[j])
      }
    }
  }
  return r
}
/* -------------------------------------------------------------------------- */
// Outer product of two vectors. The result is stored in r.
func (r *DenseIntMatrix) Outer(a, b ConstVector) Matrix {
  n, m := r.Dims()
  if a.Dim() != n || b.Dim() != m {
    panic("matrix/vector dimensions do not match!")
  }
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.At(i, j).Mul(a.ConstAt(i), b.ConstAt(j))
    }
  }
  return r
}
func (r *DenseIntMatrix) OUTER(a, b DenseIntVector) Matrix {
  n, m := r.Dims()
  if a.Dim() != n || b.Dim() != m {
    panic("matrix/vector dimensions do not match!")
  }
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.AT(i, j).MUL(a.AT(i), b.AT(j))
    }
  }
  return r
}
/* -------------------------------------------------------------------------- */
// Compute the Jacobian of f at x_. The result is stored in r.
func (r *DenseIntMatrix) Jacobian(f func(ConstVector) ConstVector, x_ MagicVector) Matrix {
  n, m := r.Dims()
  x := x_.CloneMagicVector()
  x.Variables(1)
  // compute Jacobian
  y := f(x)
  // reallocate matrix if dimensions do not match
  if x.Dim() != m || y.Dim() != n {
    panic("invalid dimension")
  }
  // copy derivatives
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.At(i, j).SetFloat64(y.ConstAt(i).GetDerivative(j))
    }
  }
  return r
}
// Compute the Hessian of f at x_. The result is stored in r.
func (r *DenseIntMatrix) Hessian(f func(ConstVector) ConstScalar, x_ MagicVector) Matrix {
  n, m := r.Dims()
  // reallocate matrix if dimensions do not match
  if x_.Dim() != n || n != m {
    panic("invalid dimension")
  }
  x := x_.CloneMagicVector()
  x.Variables(2)
  // evaluate function
  y := f(x)
  // copy second derivatives
  for i := 0; i < n; i++ {
    for j := 0; j < m; j++ {
      r.At(i, j).SetFloat64(y.GetHessian(i, j))
    }
  }
  return r
}