1 files changed, 19 insertions, 9 deletions

diff --git a/sum4.awk b/sum4.awk
index 6a06455..aa3f044 100644
--- a/sum4.awk
+++ b/sum4.awk
@@ -4,6 +4,7 @@
 # input:    rows of integers and strings
 # output:   sums of numeric columns
 
+
 function isnum(n) {
     sign = "[+-]?"
     decimal = "[0-9]+[.]?[0-9]*"
@@ -13,24 +14,33 @@ function isnum(n) {
     return n ~ number
 }
 
-NR==1 {
+
+BEGIN { OFS = FS }
+
+NR == 1 {
     nf_max = NF
-    for (i=1; i<=NF; i++) {
-        (!isnum($i)) ? header[i] = $i : header[i] = "col" i
-    }
+    for (i=1; i<=NF; i++)
+        isnum($i) ? header[i] = "col" i : header[i] = $i
 }
 
 {
+    if (NF > nf_max)
+        nf_max = NF
     for (i=1; i<=NF; i++) {
-        sum[i] += $i
-        count[i]++
+        if ($i == header[i])
+            continue
+        if (isnum($i)) {
+            count[i]++
+            sum[i] += $i
+        }
     }
 }
 
 END {
     for (i=1; i<=nf_max; i++) {
-        if (header[i])
-            printf("%s:" OFS, header[i])
-        printf(OFMT ORS, sum[i])
+        printf((header[i]) ? header[i] OFS : OFS)
+        printf((count[i]) ? count[i] OFS sum[i] : OFS)
+        printf(ORS)
     }
 }
+