From 2c97e5ad3f287a4e4b1600968f83886de34cfaf1 Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@tremily.us>
Date: Mon, 16 Jul 2012 23:01:18 -0400
Subject: [PATCH] Preliminary support for dependent formula waves.

---
 igor/binarywave.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/igor/binarywave.py b/igor/binarywave.py
index 7953ff1..856c85f 100644
--- a/igor/binarywave.py
+++ b/igor/binarywave.py
@@ -530,14 +530,16 @@ def loadibw(filename, strict=True):
             shape = [n for n in wave_info['nDim'] if n > 0] or (0,)
         else:
             shape = (wave_info['npnts'],)
+        t = numpy.dtype(numpy.int8)  # setup a safe default
         if wave_info['type'] == 0:  # text wave
             shape = (waveDataSize,)
-            t = numpy.dtype(numpy.int8)
-        else:
+        elif wave_info['type'] in TYPE_TABLE or wave_info['npnts']:
             t = numpy.dtype(TYPE_TABLE[wave_info['type']])
             assert waveDataSize == wave_info['npnts'] * t.itemsize, (
                 '{}, {}, {}, {}'.format(
                     waveDataSize, wave_info['npnts'], t.itemsize, t))
+        else:
+            pass  # formula waves
         if wave_info['npnts'] == 0:
             data_b = buffer('')
         else:
-- 
2.26.2