Appends data to existing plotted data

        :param axeskey: name of data plot to update. Valid options are 'stim' or 'response'
        :type axeskey: str
        :param bins: bins to plot a point for
        :type bin: numpy.ndarray
        :param ypoints: iteration number of raster, *should* match bins dimension, but really takes the first value in array for iteration number and plot row at proper place for included bins
        :type ypoints: numpy.ndarray

def appendData(self, axeskey, bins, ypoints):
        """Appends data to existing plotted data

        :param axeskey: name of data plot to update. Valid options are 'stim' or 'response'
        :type axeskey: str
        :param bins: bins to plot a point for
        :type bin: numpy.ndarray
        :param ypoints: iteration number of raster, *should* match bins dimension, but really takes the first value in array for iteration number and plot row at proper place for included bins
        :type ypoints: numpy.ndarray
        """
        if axeskey == 'raster' and len(bins) > 0:
            x, y = self.rasterPlot.getData()
            # don't plot overlapping points
            bins = np.unique(bins)
            # adjust repetition number to response scale
            ypoints = np.ones_like(bins)*self.rasterYslots[ypoints[0]]
            x = np.append(x, bins)
            y = np.append(y, ypoints)
            self.rasterPlot.setData(x, y)