Function sub

src/algorithms/math/matrix/Matrix.js:295–309

(a, b)

 * @return {Matrix}
 */
export const sub = (a, b) => {
  validateSameShape(a, b);
  const result = zeros(shape(a));

  walk(a, (cellIndices, cellValue) => {
    updateCellAtIndex(result, cellIndices, cellValue);
  });

  walk(b, (cellIndices, cellValue) => {
    const currentCellValue = getCellAtIndex(result, cellIndices);
    updateCellAtIndex(result, cellIndices, currentCellValue - cellValue);
  });

  return result;
};