[Yt-svn] yt-commit r534 - trunk/yt/lagos

[mturk at wrangler.dreamhost.com]

Author: mturk
Date: Wed Jun  4 14:14:49 2008
New Revision: 534
URL: http://yt.spacepope.org/changeset/534

Log:
Added an "Extrema" quantity.  This will get propagated back up to the lazy
profilers.  (But, again, it will be much slower to do it this way --
particularly with sphere -- than feeding in your own bin limits.)



Modified:
   trunk/yt/lagos/DerivedQuantities.py

Modified: trunk/yt/lagos/DerivedQuantities.py
==============================================================================
--- trunk/yt/lagos/DerivedQuantities.py	(original)
+++ trunk/yt/lagos/DerivedQuantities.py	Wed Jun  4 14:14:49 2008
@@ -190,3 +190,22 @@
     return bound
 add_quantity("IsBound",function=_IsBound,combine_function=_combIsBound,n_ret=1,
              force_unlazy=True)
+
+def _Extrema(data, fields):
+    fields = ensure_list(fields)
+    mins, maxs = [], []
+    for field in fields:
+        if data[field].size < 1:
+            mins.append(1e90)
+            maxs.append(-1e90)
+            continue
+        mins.append(data[field].min())
+        maxs.append(data[field].max())
+    return len(fields), mins, maxs
+def _combExtrema(data, n_fields, mins, maxs):
+    mins, maxs = na.atleast_2d(mins, maxs)
+    n_fields = mins.shape[1]
+    return [(na.min(mins[:,i]), na.max(maxs[:,i])) for i in range(n_fields)]
+add_quantity("Extrema", function=_Extrema, combine_function=_combExtrema,
+             n_ret=3)
+