function rowPluckB(product, left, rowIndex) {
  var columns = left.columns;
  var rowBase = columns * rowIndex;
  for (var column = 0; column < columns; column++) {
    left.deltas[rowBase + column] = product.deltas[column];
  }
}
function rowPluckB(product, left, rowIndex) {
  var columns = left.columns;
  var rowBase = columns * rowIndex;
  for (var column = 0; column < columns; column++) {
    left.deltas[rowBase + column] = product.deltas[column];
  }
}
function rowPluckB ( product , left , rowIndex ) { var columns = left . columns ; var rowBase = columns * rowIndex ; for ( var column = 0 ; column < columns ; column ++ ) { left . deltas [ rowBase + column ] = product . deltas [ column ] ; } }
adds {from} deltas into {m} deltas
@param {Matrix} product
@param {Matrix} left
@param {Number} rowIndex
adds { from } deltas into { m } deltas
rowPluckB - Plucks a row into the left