task4.coffee

$(document).ready ->

  class TaskFour
    MAX_VALUE = Number.MAX_VALUE

    constructor: (n = 3) ->
      @n = n
      console.log "N = #{@n}"
      @s = @_setArray(@n + 1)
      @s[0] = 3.4
      console.log "S1 = #{@s[0]}"
      @s[@n] = 5.2
      console.log "S{#{@n + 1}} = #{@s[@n]}"
      @mumax_const = 3.2
      console.log "mu max = #{@mumax_const}"
      @ks_const = 5.3
      console.log "ks = #{@ks_const}"
      @y = 4.5
      console.log "y = #{@y}"

      @algorithm()

    algorithm: ->
      start = new Date().getTime()
      theta = @_setArray()

      interval = []

      for i in [0..50] by 5
        interval.push(i)

      for i in [0...@n]
        min_thetha_iter = MAX_VALUE
        current_theta = theta[i]
        current_s_next = @s[i + 1]
        # выбираем возможный s_{i+1} выбираем минимальный
        for s_next in interval
          current_theta =
            @theta(@s[i], s_next, @s[@n], i is @n - 1)

          if current_theta < min_thetha_iter
            current_s_next = s_next
            min_thetha_iter = current_theta
        #  обновляем s_{i+1} и значения для i стейджа
        @s[i + 1] = current_s_next
        theta[i] = min_thetha_iter

      for i in [0...theta.length]
        resTheta = Math.round(theta[i])
        console.log("theta {0} = #{i + 1} #{resTheta}")

      end = new Date().getTime()
      time = end - start
      @res = [@n, time]
      @res

    theta: (s_current, s_next, s_last, is_last) ->
      if is_last
        val = (@ks_const + s_current) / @mumax_const / s_current
      else
        val = (@ks_const + s_current) * (s_next - s_current) / @mumax_const / s_current / (s_last - s_current)

      if val > 0 then val else MAX_VALUE

    _setArray: (step = 1) ->
      array = []

      for i in [0..@n] by step
        array.push(0)

      array.slice(0)

  class App
    constructor: ->
      performanceArray = []

      for i in [0...1000] by 10
        alg = new TaskFour(i)
        performanceArray.push(alg.res)

      graphData = [
        data: performanceArray
        color: 'blue'
      ]

      $.plot($('#graph-lines'), graphData, @getParams)

    getParams: ->
      params =
        series:
          points:
            show: true
            radius: 0
          lines:
            show: true
          shadowSize: 2
        grid:
          color: "#646464"
          borderColor: "transparent"
          borderWidth: 20
          hoverable: true
        xaxis:
          ticks: 15
          tickColor: "transparent"
          tickDecimals: 1
        yaxis:
          tickSize: 1
          min: -1
          max: 2

  App()