text: import { mapper as mapperColumns } from '@vect/columns-mapper'
  import { minBy as vecMinBy }       from '@vect/vector-indicator'
  
  export const min = function (matrix) {
    const indicator = this
    return mapperColumns(matrix, (col) => vecMinBy(col, indicator))
  }
  
  export const minBy = (matrix, indicator) => min.call(indicator, matrix)
  
  export const Min = (indicator) => min.bind(indicator)
  