obartra/ssim

import { Matrix } from '../types'

/**
 * Transposes a vector or a matrix
 *
 * This method mimics Matlab's `transpose` method (which equals to the `A.'` syntax)
 *
 * `B = A.'` returns the nonconjugate transpose of A, that is, interchanges the row and column index
 * for each element.
 *
 * This method does not handle complex or imaginary numbers
 *
 * @method transpose
 * @param {Matrix} A - The matrix to transpose
 * @returns {Matrix} B - The transposed matrix
 * @public
 * @memberOf matlab
 */
export function transpose({ data: ref, width, height }: Matrix): Matrix {
  const data = new Array(width * height)

  for (let i = 0; i < height; i++) {
    for (let j = 0; j < width; j++) {
      data[j * height + i] = ref[i * width + j]
    }
  }

  return {
    data,
    height: width,
    width: height,
  }
}