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Java library with basic math stuff

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/**
 * Copyright (C) 2014-2020 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.helger.numbercruncher.matrix;

public class IdentityMatrix extends SquareMatrix
{
  /**
   * Constructor.
   *
   * @param n
   *        the number of rows == the number of columns
   */
  public IdentityMatrix (final int n)
  {
    super (n);
    for (int i = 0; i < n; ++i)
      m_aValues[i][i] = 1;
  }

  /**
   * Convert a square matrix into an identity matrix.
   *
   * @param sm
   *        the square matrix to convert
   */
  public static void convert (final SquareMatrix sm)
  {
    for (int r = 0; r < sm.m_nRows; ++r)
    {
      for (int c = 0; c < sm.m_nCols; ++c)
      {
        sm.m_aValues[r][c] = (r == c) ? 1 : 0;
      }
    }
  }
}