def change_val(self, newval):
        floatVal = float(newval) * self.floatStepSize + self.floatMinVal
        self.setToolTip("%g" % floatVal)
        self.update_parent()
Compute Q matrix, used to identify the next pair of nodes to join.
dataset/ETHPy150Open VisTrails/VisTrails/vistrails/gui/mashups/mashups_widgets.py/QSliderWidget.change_val--crossover with--dataset/ETHPy150Open biocore/scikit-bio/skbio/tree/_nj.py/_compute_q