Function updateCellAtIndex

src/algorithms/math/matrix/Matrix.js:230–240

(m, cellIndices, cellValue)

 * @param {Cell} cellValue - New cell value
 */
export const updateCellAtIndex = (m, cellIndices, cellValue) => {
  // We start from the row at specific index.
  let cell = m[cellIndices[0]];
  // Going deeper into the next dimensions but not to the last one to preserve
  // the pointer to the last dimension array.
  for (let dimIdx = 1; dimIdx < cellIndices.length - 1; dimIdx += 1) {
    cell = cell[cellIndices[dimIdx]];
  }
  // At this moment the cell variable points to the array at the last needed dimension.
  cell[cellIndices[cellIndices.length - 1]] = cellValue;
};

/**
 * Adds two matrices element-wise.