Exemple #1
0
 def process(self, data, display=True):
     params = ['Amp1', 'Amp2', 'Time', 'Rise', 'Decay', 'Decay2']
     guess = tuple([self.ctrls['guess' + name].value() for name in params])
     bounds = [(self.ctrls['min' + name].value(), self.ctrls['max' + name].value()) for name in params]
     rp = self.ctrls['risePower'].value()
     
     minTime = self.ctrls['minTime'].value()
     times = data.xvals('Time')
     fullTimes = times
     data = data.view(np.ndarray)
     
     startInd = np.argwhere(times>=minTime)[0]
     
     times = times[startInd:]
     data = data[startInd:]
     
     ## Ignore specified guess amplitude; make a better guess.
     mx = data.max()
     mn = data.min()
     if abs(mn) > abs(mx):
         amp = mn
     else:
         amp = mx
     params[0] = amp
     params[1] = amp
     
     
     
     fit = functions.fitDoublePsp(x=times, y=data, guess=guess, bounds=bounds, risePower=rp)
     
     if self.ctrls['computeWaveform'].isChecked():
         fitData = functions.doublePspFunc(fit, fullTimes, rp)
     else:
         fitData = None
     return {'fitParams': fit, 'fitYData': fitData, 'fitXData': fullTimes}
Exemple #2
0
 def process(self, data, display=True):
     
     rp = self.ctrls['risePower'].value()
     stimTime = self.ctrls['stimulusTime'].value()
     times = data.xvals('Time')
     dt = times[1] - times[0]
     data1 = data.view(np.ndarray)
     if stimTime > times[-1]:
         raise Exception("stimulusTime is larger than length of input data.")
     stimInd = np.argwhere(times>=stimTime)[0][0]
     
     # 1. make sure offset is removed
     offset = np.median(data1[:stimInd])
     data2 = data1 - offset
     
     # 2. check for zero-crossing events within 4ms after stimulus
     cross = functions.zeroCrossingEvents(data2[stimInd:])
     maxInd = 4e-3 / dt
     minLength = self.ctrls['minDirectDuration'].value() / dt
     gotEvent = None
     for start, length, sum, peak in cross:
         if start > maxInd:
             break
         if length < minLength:
             continue
         if gotEvent is None or length > gotEvent[1]:
             gotEvent = (start+stimInd, length)
     #if len(cross) == 0: ## must be a single large event
         #gotEvent = (0, len(data2)-stimInd)
     
     fitParams = dict(
         directFitAmp1=0., directFitAmp2=0., directFitTime=0., 
         directFitRise=0., directFitDecay1=0., directFitDecay2=0.,
         directFitPeakTime=0., directFitPeak=0., directFitSubtracted=False,
         directFitValid=False,
         )
     
     # 3. if there is no large event near stimulus, return original data
     if gotEvent is None:
         if display:
             self.plotItem.clear()
         return {'output': data, 'fitParams': fitParams, 'plot': self.plotItem}
     
     #print "============"
     #print stimInd
     #print gotEvent
     #print cross[:20]
     
     # 4. guess amplitude, tau from detected event
     evStart = gotEvent[0]
     evEnd = evStart + gotEvent[1]
     evRgn = data2[evStart:evEnd]
     #pg.plot(evRgn)
     mx = evRgn.max()
     mn = evRgn.min()
     ampGuess = mx if abs(mx) > abs(mn) else mn
     tauGuess = gotEvent[1] * dt
     if ampGuess < 0:
         ampBound = [None, 0]
     else:
         ampBound = [0, None]
     
     # 5. fit
     guess = [ampGuess*2, ampGuess*2, stimTime, 1e-3, tauGuess*0.5, tauGuess*2]
     bounds = [
         ampBound, ampBound,
         [stimTime, stimTime+4e-3],
         [1e-4, 100e-3],
         [1e-3, 1],
         [5e-3, 10],
     ]
     #print guess
     #print bounds
     endInd = evStart + gotEvent[1] * 10
     fitYData = data2[stimInd:endInd]
     fitXData = times[stimInd:endInd]
     fit = functions.fitDoublePsp(x=fitXData, y=fitYData, guess=guess, bounds=bounds, risePower=rp)
     
     # 6. subtract fit from original data (offset included), return
     y = functions.doublePspFunc(fit, times, rp)
     
     if display:
         self.plotItem.setData(x=fitXData, y=y[stimInd:endInd], pen=self.ctrls['plotColor'].color())        
         
     ## prepare list of fit params for output
     (xMax, yMax) = functions.doublePspMax(fit)
     xMax -= fit[2]  ## really interested in time-to-peak, not the exact peak time.
     
     fitParams = dict(
         directFitAmp1=fit[0], directFitAmp2=fit[1], directFitTime=fit[2], 
         directFitRise=fit[3], directFitDecay1=fit[4], directFitDecay2=fit[5],
         directFitPeakTime=xMax, directFitPeak=yMax, directFitSubtracted=None, directFitValid=True,
         )
         
     if self.ctrls['subtractDirect'].isChecked():
         out = metaarray.MetaArray(data-y, info=data.infoCopy())
         fitParams['directFitSubtracted'] = True
     else:
         out = data
         fitParams['directFitSubtracted'] = False
         
         
     return {'fitParams': fitParams, 'output': out, 'plot': self.plotItem}