R中的矢量化迭代循环

各位，我想将以下Visual Basic代码翻译成R：

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Function WetBulb(T As Double, WDes As Double, PAtm As Double)
' Function to calculate wet-bulb temperature from dry-bulb
' and humidity ratio
Dim Wsat As Double
Dim TWBOld As Double
Dim WOld As Double
Dim TWBNew As Double
Dim TWB As Double
Dim WStar As Double
Dim W As Double
Dim slope As Double
Wsat = HumRatRH(T, RHMax, PAtm)
TWBOld = T
WOld = Wsat
TWBNew = TWBOld - 1
Do
    TWB = TWBNew
    WStar = HumRatRH(TWB, RHMax, PAtm)
    W = ((HfgRef - (CpWat - CpVap) * TWB) * WStar - CpAir * (T - TWB)) / (HfgRef + CpVap * T - CpWat * TWB)
    slope = (W - WOld) / (TWB - TWBOld)
    TWBNew = TWB - (W - WDes) / slope
    If Abs(W - WDes) < Abs(WOld - WDes) Then
        WOld = W
        TWBOld = TWB
    End If
Loop Until Abs((TWBNew - TWB) / TWB) < tolRel
WetBulb = TWB
End Function

<代码>''或'''''''''''''''''''''''''''''''''''''''''''''' 功能湿球（T为双功能，WDes为双功能，PAtm为双功能） '从干球计算湿球温度的函数 温湿度比 将Wsat调暗为双精度 双倍粗体 双倍暗淡的世界 将TWB新建为双精度 双倍调暗TWB 将WStar调暗为双精度 暗W为双色 暗坡为双坡 Wsat=HumRatRH（T，RHMax，PAtm） TWBOld=T WOld=Wsat TWBNew=TWBOld-1 做 TWB=TWBNew WStar=湿度（TWB、RHMax、PAtm） W=（（HfgRef-（CpWat-CpVap）*TWB）*WStar-CpAir*（T-TWB））/（HfgRef+CpVap*T-CpWat*TWB） 斜率=（W-WOld）/（TWB-TWBOld） TWBNew=TWB-（W-WDes）/斜率 如果Abs（W-WDes） 我遇到的困难是循环涉及到一个向量，所以我需要以某种方式对这个循环和if语句进行向量化。下面是我的尝试，但我想我只矢量化了我需要矢量化的两个中的一个。我已经包含了所有必要的函数和常量，以便代码段能够运行。函数位于底部。我还包括了一个带有正确答案的测试代码片段

非常感谢您的帮助

# Constants independent of unit system
NMol   = 0.62198       # ratio of molecular weights, Mvap/MAir
RHMax  = 1             # maximum relative humidity, 1 or 100 (if percent)
tolRel = 0.000001      # relative error tolerance for iteration

# Constants for English Units
# Note: constants currently configured for PAtm in atmospheres
HfgRef = 1061          # heat of vaporization at 0C, Btu/hr.lbm.F
CpVap = 0.444          # specific heat of water vapor, Btu/hr.lbm.F
CpWat = 1              # specific heat of liquid water, Btu/hr.lbm.F
CpAir = 0.24           # specific heat of dry air, Btu/hr.lbm.F
RAir = 0.02521         # gas constant for air, (user pressure).ft3/lbm.R
kPaMult = 101.325      # multiplier to get kPascals from user pressure
TAbs = 459.67          # add to user temperature to get absolute temp
TKelMult = 0.555556    # multiplier to get Kelvin from user temp
TAmb = 70              # typical temperature in user units (initial value)
#####################################################################
SatPress <- function(TArg) {

# Define constants for vapor pressure correlations
C1  = -5674.5359
C2  = -0.51523058
C3  = -0.009677843
C4  = 0.00000062215701
C5  = 2.0747825E-09
C6  = -9.484024E-13
C7  = 4.1635019
C8  = -5800.2206
C9  = -5.516256
C10 = -0.048640239
C11 = 0.000041764768
C12 = -0.000000014452093
C13 = 6.5459673

T = (TArg + TAbs) * TKelMult
# Use different correlations for pressure over ice or water
    kPa.lo = exp(C1 / T + C2 + T * C3 + T * T * (C4 + T * (C5 + C6 * T)) + C7 * log(T))
    kPa.hi = exp(C8 / T + C9 + T * (C10 + T * (C11 + T * C12)) + C13 * log(T))
kPa = ifelse(T < 273.15, kPa.lo, kPa.hi)
SatPress = kPa / kPaMult
return(SatPress)

}
#####################################################################

HumRatRH = function(T,RH,PAtm) {
# function to calculate humidity ratio from temperature
# and relative humidity
pw = SatPress(T) * RH / RHMax
HumRatRH = NMol * pw / (PAtm - pw)
return(HumRatRH)
}
#####################################################################
WetBulb = function(T, WDes,PAtm) {
# Function to calculate wet-bulb temperature from dry-bulb
# and humidity ratio
Wsat = HumRatRH(T, RHMax, PAtm)
TWBOld = T
WOld = Wsat
TWBNew = TWBOld - 1
iterate.TWB = function(x) {
    repeat {
    TWB = TWBNew
    WStar = HumRatRH(TWB, RHMax, PAtm)
    W = ((HfgRef - (CpWat - CpVap) * TWB) * WStar - CpAir * (T - TWB)) / (HfgRef + CpVap * T - CpWat * TWB)
    slope = (W - WOld) / (TWB - TWBOld)
    TWBNew = TWB - (W - x) / slope
    TWBOld=ifelse(abs(W - x) < abs(WOld - x),TWB,TWBOld) # update TWBOld first
    WOld=ifelse(abs(W - x) < abs(WOld - x),w,WOld)       # then update WOld
    if (abs((TWBNew - TWB) / TWB) < tolRel) break()
    }
    return(TWB)
}
WetBulb = sapply(WDes, iterate.TWB)
return(WetBulb)
}

#####################################################################

temp = c(80,55,100)
w = c(0.011,0.009,0.016)
PAtm = 0.8187308
WetBulb(temp,w,PAtm)

# The correct answer:
# 62.95381538   51.3986312   74.02877887

#独立于单位制的常数
NMol=0.62198#分子量比，Mvap/MAir
RHMax=1#最大相对湿度，1或100（如果百分比）
tolRel=0.000001#迭代的相对误差容限
#英制单位常数
#注：当前为大气中的PAtm配置的常数
HfgRef=1061#0℃时的蒸发热，Btu/hr.lbm.F
CpVap=0.444#水蒸汽比热，Btu/hr.lbm.F
CpWat=1#液态水的比热，Btu/hr.lbm.F
CpAir=0.24#干燥空气的比热，Btu/hr.lbm.F
RAir=0.02521#空气的气体常数（用户压力）。ft3/lbm.R
kPaMult=101.325#从用户压力中获取kPascals的乘数
TAbs=459.67#添加到用户温度以获得绝对温度
TKelMult=0.555556#从用户温度获得开尔文的乘数
TAmb=70#以用户单位表示的典型温度（初始值）
#####################################################################
SatPress对函数
f
进行矢量化的最简单方法是使用
矢量化
。默认情况下，它对其所有参数进行向量化
f
。在本例中，您只希望对3个参数中的2个参数进行矢量化，因此可以通过
vectorize.args
指定此参数

WetBulb <- Vectorize(WetBulb, vectorize.args=c("T", "WDes"))

wetble我怀疑
iterate.TWB
中
return
之前的
if
语句有问题。尝试：
if（all（abs（（TWBNew-TWB）/TWB）
，但您可能会进行比某些输入所需更多的计算。您好，我对计算湿球温度的函数很感兴趣。这个版本是最新的吗？我可以这样使用吗？非常感谢。嗨@agenis，是的，这是最新的。请注意，它只在IP单元中工作。