1 files changed, 35 insertions, 0 deletions
diff --git a/diff1.awk b/diff1.awk
new file mode 100644
index 0000000..41859db
--- /dev/null
+++ b/diff1.awk
@@ -0,0 +1,35 @@
+
+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] = "d" $n
+        else
+            header[n] = "col_" n
+        printf("%s,", header[n])
+    }
+}
+
+NF != 0 {
+    if (NF > max_nf)
+        max_nf = NF
+
+    ### iterate over columns
+    for (y=1; y<=max_nf; y++) {
+        if ($y ~ number) {
+            data[y] = $y
+            diff[y] = data[y] - data_prev[y]
+            printf("%g,", diff[y])
+            data_prev[y] = data[y]
+        }
+    }
+    printf("\n")
+}