1 files changed, 37 insertions, 0 deletions
diff --git a/diff.awk b/diff.awk
new file mode 100644
index 0000000..3923f8b
--- /dev/null
+++ b/diff.awk
@@ -0,0 +1,37 @@
+
+BEGIN {
+    sign = "[+-]?"
+    decimal = "[0-9]+[.]?[0-9]*"
+    fraction = "[.][0-9]*"
+    exponent = "([Ee]" sign "[0-9]+)?"
+    number = "^" sign "(" decimal "|" fraction ")" exponent "$"
+}
+
+NR == 1 {
+    header_nf = NF
+    for (n=1; n<=NF; n++) {
+        if ($n !~ number)
+            header[n] = $n
+        else
+            header[n] = n
+    }
+}
+
+NF != 0 {
+    printf("\n%s: %s\n", NR, $0)
+    if (NF > max_nf)
+        max_nf = NF
+
+    ### iterate over columns
+    for (y=1; y<=max_nf; y++) {
+        if ($y ~ number) {
+            count[y] += 1
+            data[y] = $y
+            sum[y] += $y
+            mean[y] = data[y]
+            diff[y] = data[y] - data_prev[y]
+            print header[y], data[y], sum[y], diff[y]
+            data_prev[y] = data[y]
+        }
+    }
+}