* Added initial support for errorbar object, which includes

compression-to-string (ad hoc implementation is written in C++ with the
  help of my cp.inc library, unfortunately).

math/stats/compress_errorbar.cc

@@ -0,0 +1,56 @@
+/*
+
+$Id: compress_errorbar.cc,v 1.1 2010-10-19 20:19:25 wirawan Exp $
+
+Date: 20101007
+Wirawan Purwanto
+
+Small C++ utility to quickly compress an errorbar.
+
+*/
+
+#include <cstdio>
+
+#include "cp.inc/pcharlib.cpp"
+#include "cp.inc/pcharconv.cpp"
+
+using namespace std;
+
+int main(int argc, char *argv[], char *env[])
+{
+    double v, e;
+    int errdigits = 2;
+
+    if (argc < 3)
+    {
+        fprintf(stderr, "Minimum of two arguments required.\n");
+        return 2;
+    }
+
+    if (EOF == sscanf(argv[1], "%lg", &v))
+    {
+        fprintf(stderr, "Invalid value: %s", argv[1]);
+        return 1;
+    }
+
+    if (EOF == sscanf(argv[2], "%lg", &e))
+    {
+        fprintf(stderr, "Invalid errorbar: %s", argv[2]);
+        return 1;
+    }
+
+    if (argc > 3)
+    {
+        if (EOF == sscanf(argv[3], "%d", &errdigits))
+        {
+            fprintf(stderr, "Invalid errorbar digits: %s", argv[3]);
+            return 1;
+        }
+    }
+
+    avgtostr compress_errorbar;
+    fputs(+compress_errorbar(v, e, errdigits), stdout);
+    fputs("\n", stdout);
+
+    return 0;
+}