iRule Math - Square Root?

Here is a solution using Newton's method to calculate a square root:

when HTTP_REQUEST {
  set input [URI::query [HTTP::uri] "input"]
    if { ([HTTP::path] equals "/sqrt") && ($input ne "") } {
      if { $input == 0 } {
        set sqrt 0
      } else {
          set x [expr {abs($input)}]
          while { 1 } {
            set y [expr (($x+($input/$x))/2)]
            if { [expr (abs($x-$y))] < 0.01 } break
            set x $y
          }
          set sqrt $y
      }
    HTTP::respond 200 content "The square root of $input is $sqrt"
  }
}

http://test-http-virtual/sqrt?input=144 => "The square root of 144 is 12"

http://test-http-virtual/sqrt?input=225.25 => "The square root of 225.25 is 15.0083321641"

http://test-http-virtual/sqrt?input=67108864.0 => "The square root of 67108864.09 is 8192.00000549"

Hope that helps,

George