meeus47a.frink

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// This program reads coefficients for moon position from meeus47a.txt.
// It is used to find moon longitude and distance.

sumL = "   sumL = ("
sumR = "   sumR = ("

for line = lines["file:meeus47a.txt"]
{
   [D, M, MP, F, l, r] = split[%r/\t/, line]

   M = eval[M]

   coeffL = ""
   coeffR = ""
   arg = fmt[D, "D"]

   arg = arg + fmt[M, "M"]
   arg = arg + fmt[MP, "MP"]
   arg = arg + fmt[F, "F"]

   if (M != 0)
   {
      if (abs[M] == 1)
      {
        if (l != "0")
           coeffL = "$l E"
        if (r != "0")
           coeffR = "$r E"
      } else
         if (abs[M] == 2)
         {
           if (l != "0")
              coeffL = "$l E^2"
           if (r != "0")
              coeffR = "$r E^2"
         }
   } else
         {
            if (l != "0")
               coeffL = l
            if (r != "0")
               coeffR = r
         }

   if (coeffL != "")
      sumL = sumL + " + ($coeffL) sin[$arg]";
   if (coeffR != "")
      sumR = sumR + " + ($coeffR) cos[$arg]";
}

sumL = sumL + ")"
sumR = sumR + ")"

println[sumL]
println[]
println[sumR]

fmt[x, char] := 
{
   x = eval[x]

   if (x == 1)
      return " + $char"

   if (x == -1)
      return " - $char"

   if x > 0
      return " + $x $char"

   if x < 0
      return " -" + (-x) + " $char"

   return ""
}


Download or view meeus47a.frink in plain text format

This is a program written in the programming language Frink.
For more information, view the Frink Documentation or see More Sample Frink Programs.

Alan Eliasen was born 20145 days, 13 hours, 46 minutes ago.