added MixingratioToPermil

da/tools/MixingratioToPermil.py

+#!/usr/bin/env python
+# MixingratioToPermil.py
+
+"""
+Author : ivar 
+
+Revision History:
+File created on 11 May 2012.
+
+"""
+
+
+def MixingratioToPermil(filename,simulated):
+    """ Converts 13C mixing ratios to permil values"""
+    import da.tools.io4 as io
+    from numpy import array
+
+    pdb         = 0.011112
+
+    trlength=len(simulated[0,:])
+    memlength=trlength/2
+    simulated=simulated*1.e6 #convert to ppm
+    simulated[:,memlength:trlength]=1000.*((simulated[:,memlength:trlength]/simulated[:,0:memlength]/pdb)-1.)
+
+
+    print simulated
+
+    return simulated
+
+
+if __name__ == "__main__":
+    pass