Distance is in Km. If I recall the starting point was the Penguin
Picnic area (where the Gat RR used to start).
>>>>> "Bob" == Simpson, Bob <[EMAIL PROTECTED]> writes:
Bob> What units are the 'distances" in. Fortune Lake is about
Bob> 2.25 km long (7.34 - 5.19). Is that 5.19 km from some
Bob> starting point? Obviously that first 8.36% isn't for the
Bob> first 5.19 km. Is it an instantaneous measurement of the
Bob> grade at that point? Percent grade to 5 decimals.
Bob> Impressive accuracy. I would guess that rolling over a
Bob> pebble would cause a change of more than 0.00001%! LOL
Mea culpa. What can I say for an awk script I whipped together in a
couple of minutes which was used to feed a plotting program. Rounding
to the "correct" accuracy is rather irrelavent for the intended
application as one can't really make out too many places of accuracy
when plotted. I believe the distance measurements are out by 1% too.
Elevations were measured barometrically, so they aren't all that
precise either.
It is left as an exercise to the reader to change "print" to "printf"
with appropriate args. "d" is difference in distance in kilometres as
measured by the Avocet. "h" is difference in elevation in metres as
measured by the Avocet. "grade" is percent grade.
BEGIN { oldd = 0; oldh = 0; maxgrade = 0 }
{
d = $1 - oldd; oldd = $1;
h = $2 - oldh; oldh = $2;
d = d * 1000;
if ( d * d > h * h ) grade = h * 100 / sqrt( d * d - h * h ); else grade = 0;
if ( maxgrade * maxgrade < grade * grade ) maxgrade = grade;
print $1, $2, grade
}
END { print "Max grade is ", maxgrade }
Note: awk doesn't have 'abs()', so x * x is used to get
unsigned magnitudes. Why bother with extra comparisons???? :-)
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