1 files changed, 100 insertions, 0 deletions
diff --git a/gr-input/python/Transfer_Function.py b/gr-input/python/Transfer_Function.py
new file mode 100644
index 000000000..d53c55e48
--- /dev/null
+++ b/gr-input/python/Transfer_Function.py
@@ -0,0 +1,100 @@
+#!/usr/bin/env python
+# 
+# Copyright 2015 <+YOU OR YOUR COMPANY+>.
+# 
+# This 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.
+# 
+# This software 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 this software; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+# 
+
+import time
+import numpy
+from gnuradio import gr
+import sciscipy
+
+class Transfer_Function(gr.sync_block):
+    """
+    docstring for block add_python
+    """
+    def __init__(self,order,itype,tstart,tstop,tstep):
+	a = []
+	self.b = [0,0,0,0,0,0]
+	self.c = [0,0,0,0,0,0]
+	self.i = 0
+        self.order=int(order)+1
+	self.itype = itype
+	self.tstart = tstart
+	self.tstop  = tstop
+	self.tstep  = tstep
+        gr.sync_block.__init__(self,
+            name="tf_rises",
+            in_sig=[numpy.float32,numpy.float32],
+            out_sig=[numpy.float32])
+	    
+	#print "I am over slept"
+        #print len(self.ret_array)
+
+    def find_resp(self,b,c):
+        if (self.itype == 11):
+            typo = "'imp'"
+        elif (self.itype == 12):
+            typo = "'step'"
+        else:
+            typo = "t"
+#        print "self b",self.b
+        string1 = "s=%s; h=syslin('c',"
+        string2 = str(b[4])+"*s^4+"+str(b[3])+"*s^3+"+str(b[2])+"*s^2+"+str(b[1])+"*s+"+str(b[0])+","
+        string3 = str(c[4])+"*s^4+"+str(c[3])+"*s^3+"+str(c[2])+"*s^2+"+str(c[1])+"*s+"+str(c[0])+");"
+        string4 = "t="+str(self.tstart)+":"+str(self.tstep)+":"+str(self.tstop)+";"
+        string5 = "deff('u=input(t)','u=50');"
+        string6 = "r=tf2ss(h); a=csim("+typo+",t,r);"
+        string = string1+string2+string3+string4+string5+string6
+        print "I am strin g",string
+        sciscipy.eval(string)
+        self.a = sciscipy.read("a")
+        print "value of a\n",self.a
+
+
+
+
+
+    def work(self, input_items, output_items):
+
+        print "input value:\n",input_items
+	for i in range(0,5):
+	    self.b[i] = input_items[0][i]
+	#    print "I am b[i]", b[i]
+	#print "I am BBBBB", self.b
+	
+	for j in range(0,5):
+	    self.c[j] = input_items[1][j]
+	    #print "I am c[j]", c[j]
+	#print "I am CCCCC", self.c
+	self.find_resp(self.b,self.c)	
+	
+	
+        out = output_items[0]
+        self.i+=1
+        print "I am self i\n",self.i
+        if self.i >= len(self.a):
+            self.i = 0
+        print "len of out\n",len(out)
+        #time.sleep(0.125)
+        out[:] = numpy.float32(self.a[self.i])
+        #print 
+        print "i am out\n",out
+        
+        return len(output_items[0])
+    
+