added diff2.awk to estimate numerical second diff;

removed commented out population covariance from cov.awk;
added decimal points to pi estimate in em.awk;

1 files changed, 1 insertions, 1 deletions

diff --git a/em.awk b/em.awk
index 2cc6a74..be84054 100644
--- a/em.awk
+++ b/em.awk
@@ -8,7 +8,7 @@ BEGIN {
     ARGV[1] ? OFMT = "%." ARGV[1] "g" : OFMT = "%.12g"
 
     # constants
-    pi = 4.0*atan2(1,1)         # rad
+    pi = 4.0*atan2(1.0,1.0)     # rad
     c0 = 299792458E0            # m/s, exact
     mu0 = (4.0E-7)*pi           # H/m = (T*m)/A = N/(A^2) = (kg*m)/(A*s)
     epsilon0 = (mu0*c0^2)^-1    # F/m = C/(V*m) = (A^2*s^4)/(kg*m^3)