org.apache.commons.math3.linear

## Interface FieldMatrixChangingVisitor<T extends FieldElement<?>>

- Type Parameters:
    `T` - the type of the field elements
  All Known Implementing Classes:
    DefaultFieldMatrixChangingVisitor

      public interface FieldMatrixChangingVisitor<T extends FieldElement<?>>

  Interface defining a visitor for matrix entries.
  Since:
    2.0

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `T` | `end()` End visiting a matrix.
    `void` | `start(int rows, int columns, int startRow, int endRow, int startColumn, int endColumn)` Start visiting a matrix.
    `T` | `visit(int row, int column, T value)` Visit one matrix entry.

- - ### Method Detail

    - #### start

          void start(int rows,
                   int columns,
                   int startRow,
                   int endRow,
                   int startColumn,
                   int endColumn)

      Start visiting a matrix.

      This method is called once before any entry of the matrix is visited.

      Parameters:
        `rows` - number of rows of the matrix
        `columns` - number of columns of the matrix
        `startRow` - Initial row index
        `endRow` - Final row index (inclusive)
        `startColumn` - Initial column index
        `endColumn` - Final column index (inclusive)

    - #### visit

          T visit(int row,
                int column,
                T value)

      Visit one matrix entry.
      Parameters:
        `row` - row index of the entry
        `column` - column index of the entry
        `value` - current value of the entry
      Returns:
        the new value to be set for the entry

    - #### end

          T end()

      End visiting a matrix.

      This method is called once after all entries of the matrix have been visited.

      Returns:
        the value that the `walkInXxxOrder` must return

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