From ed177251146ea6f757ac149f4053843abdc0e6f4 Mon Sep 17 00:00:00 2001
From: Tom Rondeau <trondeau@vt.edu>
Date: Wed, 27 Mar 2013 12:47:13 -0400
Subject: runtime: adding in some Python stuff to run code.
---
gnuradio-runtime/python/gnuradio/eng_notation.py | 74 ++++++++++++++++++++++++
1 file changed, 74 insertions(+)
create mode 100644 gnuradio-runtime/python/gnuradio/eng_notation.py
(limited to 'gnuradio-runtime/python/gnuradio/eng_notation.py')
diff --git a/gnuradio-runtime/python/gnuradio/eng_notation.py b/gnuradio-runtime/python/gnuradio/eng_notation.py
new file mode 100644
index 0000000000..d23f9005f0
--- /dev/null
+++ b/gnuradio-runtime/python/gnuradio/eng_notation.py
@@ -0,0 +1,74 @@
+#
+# Copyright 2003 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING. If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+"""
+Display numbers as strings using engineering notation.
+"""
+
+scale_factor = {}
+scale_factor['E'] = 1e18
+scale_factor['P'] = 1e15
+scale_factor['T'] = 1e12
+scale_factor['G'] = 1e9
+scale_factor['M'] = 1e6
+scale_factor['k'] = 1e3
+scale_factor['m'] = 1e-3
+scale_factor['u'] = 1e-6
+scale_factor['n'] = 1e-9
+scale_factor['p'] = 1e-12
+scale_factor['f'] = 1e-15
+scale_factor['a'] = 1e-18
+
+def num_to_str (n):
+ '''Convert a number to a string in engineering notation. E.g., 5e-9 -> 5n'''
+ m = abs(n)
+ if m >= 1e9:
+ return "%gG" % (n * 1e-9)
+ elif m >= 1e6:
+ return "%gM" % (n * 1e-6)
+ elif m >= 1e3:
+ return "%gk" % (n * 1e-3)
+ elif m >= 1:
+ return "%g" % (n)
+ elif m >= 1e-3:
+ return "%gm" % (n * 1e3)
+ elif m >= 1e-6:
+ return "%gu" % (n * 1e6) # where's that mu when you need it (unicode?)
+ elif m >= 1e-9:
+ return "%gn" % (n * 1e9)
+ elif m >= 1e-12:
+ return "%gp" % (n * 1e12)
+ elif m >= 1e-15:
+ return "%gf" % (n * 1e15)
+ else:
+ return "%g" % (n)
+
+
+def str_to_num (value):
+ '''Convert a string in engineering notation to a number. E.g., '15m' -> 15e-3'''
+ try:
+ scale = 1.0
+ suffix = value[-1]
+ if scale_factor.has_key (suffix):
+ return float (value[0:-1]) * scale_factor[suffix]
+ return float (value)
+ except:
+ raise RuntimeError (
+ "Invalid engineering notation value: %r" % (value,))
--
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