Python Scripting Box

[Kobayaski]

Hello!

I'm French student and I use OpenVibe for a project using SSVEP and a space invader video games.

I search to release my orders with correlation between one sinus(simulation of flash) and signals after a spatial filter.

The scenario contains an acquisition server(or GDF reader for test), three python scripting Box (one for each sinus) and Button Vrpn server to dialog with the application.

But, my problem is that I don't succeed to recover value (type float) for numpy.correlate().

my code:

Code: Select all

import numpy

   def process(self):
		#sinus frequency
		freq=2*numpy.pi*20
		#value input, type OVSignalBuffer
		chunk = self.input[0]
		#dimension
		siz=numpy.size(chunk)
		if(siz >=2):
			#recove in array
			numpyBuffer = numpy.array(chunk)
			#condition of traitement
			if(type(numpyBuffer) == numpy.ndarray):
				#time array simulation for sinus
				t=numpy.array(range(numpy.size(numpyBuffer)-1))
				t.astype(float).tolist()
				#release sinus
				sinus=numpy.sin(freq*t*2/180.).tolist()
				#I need to release correlate
				correl=numpy.correlate(sinus[:(siz-1)],numpyBuffer[:(siz-1)])/numpy.sqrt(numpy.sum(numpy.power(sinus,2))+numpy.sum(numpy.power(numpyBuffer,2)))
				if(correl > 0.8):
					#send Stimulation for Button vrpn server
					stimSet = OVStimulationSet(self.getCurrentTime(), self.getCurrentTime()+1./self.getClock())
					stimSet.append(OVStimulation(self.stimCode, self.getCurrentTime(), 0.))
					self.output[0].append(stimSet)
					if(siz >= 20):
						chunk=chunk.pop();