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  1. Commons Math
  2. MATH-209

RealMatrixImpl#operate gets result vector dimensions wrong

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 1.2
    • Fix Version/s: None
    • Labels:
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      Description

      org.apache.commons.math.linear.RealMatrixImpl#operate tries to create a result vector that always has the same length as the input vector. This can result in runtime exceptions if the matrix is non-square and it always yields incorrect results if the matrix is non-square. The correct behaviour would of course be to create a vector with the same length as the row dimension of the matrix.

      Thus line 640 in RealMatrixImpl.java should read
      double[] out = new double[nRows];
      instead of
      double[] out = new double[v.length];

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            • Assignee:
              Unassigned
              Reporter:
              murphy Thomas Chust
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