Anonymous avatar Anonymous committed bec1d3b

update notes in readme

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 Code from Dr. Stockwell's web site for the stockwell transform
 
 http://www.cora.nwra.com/~stockwel/index.php?module=fatcat&fatcat[user]=viewCategory&fatcat_id=2&module_title=pagemaster
+
+----
+from pylab import *
+
+The way the basic module works is, for a signal x
+y = stockwell.smt.st(x)
+will return it's complex valued transform
+the amplitude "spectra" can be obtained with
+
+ay = abs(y)
+
+The rows in the interval [0,n/2) label the number of cycles during the entire period of x (ie, it uses the length L of x as the longest time)
+
+So, to covert this back to hz
+Let
+Fs=<sampling interval in Hz>
+
+Let
+Tn = float(L * Fs) # total time, say in seconds, of x
+
+# row ii -> ii/L
+# Then the freq of row ii is
+freq[ii] = ii/Tn
 
 import _edflib
 import stockwell.smt as smt
-eegfile="/mnt/hgfs/clee/Documents/swaineeg/NKT/EEG2100/CA75510M_1-1+_1-2+.edf"
+# eegfile="/mnt/hgfs/clee/Documents/swaineeg/NKT/EEG2100/CA75510M_1-1+_1-2+.edf"
+eegfile='/home/clee/Dropbox/data/swainAFIB_CA46803E_1-1+.edf'
 open(eegfile)
 e=_edflib.Edfreader(eegfile)
 
+from __future__ import division
+from numpy import *
+from matplotlib.pyplot import *
+
+import _edflib
+import stockwell.smt as smt
+# eegfile="/mnt/hgfs/clee/Documents/swaineeg/NKT/EEG2100/CA75510M_1-1+_1-2+.edf"
+eegfile='/home/clee/Dropbox/data/swainAFIB_CA46803E_1-1+.edf'
+open(eegfile)
+e=_edflib.Edfreader(eegfile)
+
+def showst(swtransform, newfigure=True):
+    if newfigure:
+        figure()
+    imshow(swtransform, origin='lower', aspect='auto')
+    #axis('auto')
+    
+
+# read a short number of samples
+
+
+import scipy.signal as signal
+#?signal.chirp
+t=linspace(0,10,num=1000)
+chrp = signal.chirp(t)
+
+pstchrp = abs(smt.st(chrp))
+showst(pstchrp)
+
+
+
+eeg2000= zeros(2000.0)
+e.readsignal(0,0,2000,eeg2000)
+e.close()
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