8 files changed, 18 insertions, 15 deletions
diff --git a/conv.awk b/conv.awk
index 2248927..b7e48eb 100644
--- a/conv.awk
+++ b/conv.awk
@@ -4,7 +4,8 @@
 # [PoC] linear convolution (with hardcoded IR window).
 
 BEGIN {
-    X = ARGV[1]
+    ARGV[1] ? X = ARGV[1] : X = 0
+    ARGV[2] ? OFMT = "%." ARGV[2] "g" : OFMT = "%g"
     input_size = split(X, X_arr)
     #H = "1.0 1.0 1.0"      # rect
     #H = "0.25 0.50 0.25"   # von Hann
diff --git a/fib.awk b/fib.awk
index d599caa..654921c 100644
--- a/fib.awk
+++ b/fib.awk
@@ -4,7 +4,8 @@
 # fib sol'n from Hamming
 
 BEGIN {
-    n = ARGV[1]
+    ARGV[1] ? n = ARGV[1] : n = 0
+    ARGV[2] ? OFMT = "%." ARGV[2] "g" : OFMT = "%g"
     print (1/sqrt(5))*(0.5*(1 + sqrt(5)))^n - (1/sqrt(5))*(0.5*(1 - sqrt(5)))^n
 }
 
diff --git a/gaussian.awk b/gaussian.awk
index ef81b68..48c3f9a 100644
--- a/gaussian.awk
+++ b/gaussian.awk
@@ -6,7 +6,8 @@
 
 BEGIN {
 
-    N = ARGV[1]
+    ARGV[1] ? N = ARGV[1] : N = 0
+    ARGV[2] ? OFMT = "%." ARGV[2] "g" : OFMT = "%g"
     M = 0.5*(N - 1)
 
     # sigma <= 0.5
diff --git a/hamming.awk b/hamming.awk
index fd6d89c..f7ff9f7 100644
--- a/hamming.awk
+++ b/hamming.awk
@@ -7,14 +7,16 @@
 
 BEGIN {
 
-    ### R.W. Hamming, "Digital Filters"
-    # H = "0.23 0.54 0.23"
+    ARGV[1] ? N = ARGV[1] : N = 0
+    ARGV[2] ? OFMT = "%." ARGV[2] "g" : OFMT = "%g"
 
-    N = ARGV[1]
     # window interval goes from -M to M
     M = 0.5*(N - 1)
     pi = 4*atan2(1,1)
 
+    ### R.W. Hamming, "Digital Filters"
+    # H = "0.23 0.54 0.23"
+
     a0 = (25.0/46.0)
     a1 = (21.0/46.0)
 
@@ -29,10 +31,10 @@ BEGIN {
     for (n=-M; n<=M; n++) {
         if (N > 1 && M > 0) {
             w[n] = a0 + a1*cos((pi*n)/M)
-            print n, w[n]/M
+            print n + M, w[n]/M
         }
         else {
-            print n, 1.0
+            print n + M, 1.0
         }
     }
 
diff --git a/lin_reg.awk b/lin_reg.awk
index 205c43f..aa94b0a 100644
--- a/lin_reg.awk
+++ b/lin_reg.awk
@@ -87,7 +87,7 @@ END {
         for (x=1; x<=nf_max; x++) {
             if (x != y && r[x,y]) {
                 printf(OFMT OFS "(%s)" OFS " = (" OFMT " +/- " OFMT ")(%s)" OFS " + (" OFMT " +/- " OFMT ")" ORS,
-                    10.0*log(r[x,y]*r[x,y])/log(10.0),
+                    (r[x,y]*r[x,y]),
                     header[y], b[x,y], b_err[x,y],
                     header[x], a[x,y], a_err[x,y])
             }
diff --git a/pi.awk b/pi.awk
index cb476ac..69eb36e 100644
--- a/pi.awk
+++ b/pi.awk
@@ -16,7 +16,6 @@ function pi() {
 }
 
 BEGIN {
-    (ARGV[1] > 0) ? fig = ARGV[1] : fig = 6
-    str = "%." fig "g\n"
-    printf(str, pi())
+    ARGV[1] ? OFMT = "%." ARGV[1] "g" : OFMT = "%g"
+    printf(OFMT ORS, pi())
 }
diff --git a/quad_reg.awk b/quad_reg.awk
index ede06a4..a587a3a 100644
--- a/quad_reg.awk
+++ b/quad_reg.awk
@@ -118,7 +118,7 @@ END {
         for (y=1; y<=nf_max; y++) {
             if (x != y && r[x,y]) {
                 printf(OFMT OFS "(%s)" OFS " = (" OFMT ")(%s)^2" OFS " + (" OFMT ")(%s)" OFS " + (" OFMT ")",
-                    10.0*log(r[x,y]*r[x,y])/log(10), header[y], c[x,y], header[x], b[x,y], header[x], a[x,y])
+                    (r[x,y]*r[x,y]), header[y], c[x,y], header[x], b[x,y], header[x], a[x,y])
                 printf("  [" OFMT "," OFMT "][" OFMT "," OFMT "][" OFMT "," OFMT "]" OFS" [" OFMT "," OFMT "]",
                     rx0[x,y], (a[x,y] + b[x,y]*rx0[x,y] + c[x,y]*rx0[x,y]*rx0[x,y]),
                     rx1[x,y], (a[x,y] + b[x,y]*rx1[x,y] + c[x,y]*rx1[x,y]*rx1[x,y]),
diff --git a/sterling_approx.awk b/sterling_approx.awk
index aa0a748..cb5f563 100644
--- a/sterling_approx.awk
+++ b/sterling_approx.awk
@@ -18,8 +18,7 @@ function pwr(x, p) {
 
 BEGIN {
     ARGV[1] ? n = ARGV[1] : n = 0
-    ARGV[2] ? prec = ARGV[2] : prec = ""
-    prec ? OFMT = "%." prec "g" : OFMT = "%g"
+    ARGV[2] ? OFMT = "%." ARGV[2] "g" : OFMT = "%g"
     pi = 4*atan2(1,1)
     f = 0
     if (n > 0) {