Changeset 369 for trunk/python/asaplinefind.py

Timestamp:

02/06/05 17:40:28 (19 years ago)

Author:

vor010

Message:

SDLineFinder: bug corrections, setOption method
has been added + fitting baseline at each iterations to cope with bad
baselines

File:

• trunk/python/asaplinefind.py (modified) (1 diff)

trunk/python/asaplinefind.py

@@ -13 +13 @@
         return
 
+    def set_options(self,threshold=1.7320508075688772,min_nchan=3,
+        avg_limit=8,box_size=0.2):
+        """
+        Set the parameters of the algorithm
+        Parameters:
+             threshold    a single channel S/N ratio above which the 
+                          channel is considered to be a detection
+                          Default is sqrt(3), which together with
+                          min_nchan=3 gives a 3-sigma criterion
+             min_nchan    a minimal number of consequtive channels, 
+                          which should satisfy a threshold criterion to
+                          be a detection. Default is 3.
+             avg_limit    A number of consequtive channels not greater than
+                          this parameter can be averaged to search for
+                          broad lines. Default is 8.
+             box_size     A running mean box size specified as a fraction
+                          of the total spectrum length. Default is 1/5
+        Note:  For bad baselines threshold should be increased, 
+               and avg_limit decreased (or even switched off completely by
+               setting this parameter to 1) to avoid detecting baseline
+               undulations instead of real lines.  
+        """
+        self.finder.setoptions(threshold,min_nchan,avg_limit,box_size)
+        return
+             
     def set_scan(self,scan,mask=None,edge=(0,0)):
         """