def _set_iroot_via_xroot(self, xroot):
        """Determine the index of the root cell.

        Given an expression vector, find the observation index that is closest
        to this vector.

        Parameters
        ----------
        xroot : np.ndarray
            Vector that marks the root cell, the vector storing the initial
            condition, only relevant for computing pseudotime.
        """
        if self._adata.shape[1] != xroot.size:
            raise ValueError(
                'The root vector you provided does not have the '
                'correct dimension.')
        # this is the squared distance
        dsqroot = 1e10
        iroot = 0
        for i in range(self._adata.shape[0]):
            diff = self._adata.X[i, :] - xroot
            dsq = diff.dot(diff)
            if dsq < dsqroot:
                dsqroot = dsq
                iroot = i
                if np.sqrt(dsqroot) < 1e-10: break
        logg.msg('setting root index to', iroot, v=4)
        if self.iroot is not None and iroot != self.iroot:
            logg.warn('Changing index of iroot from {} to {}.'.format(self.iroot, iroot))
        self.iroot = iroot
def _set_iroot_via_xroot ( self , xroot ) : if self . _adata . shape [ 1 ] != xroot . size : raise ValueError ( 'The root vector you provided does not have the ' 'correct dimension.' ) dsqroot = 1e10 iroot = 0 for i in range ( self . _adata . shape [ 0 ] ) : diff = self . _adata . X [ i , : ] - xroot dsq = diff . dot ( diff ) if dsq < dsqroot : dsqroot = dsq iroot = i if np . sqrt ( dsqroot ) < 1e-10 : break logg . msg ( 'setting root index to' , iroot , v = 4 ) if self . iroot is not None and iroot != self . iroot : logg . warn ( 'Changing index of iroot from {} to {}.' . format ( self . iroot , iroot ) ) self . iroot = iroot
Determine the index of the root cell.

        Given an expression vector, find the observation index that is closest
        to this vector.

        Parameters
        ----------
        xroot : np.ndarray
            Vector that marks the root cell, the vector storing the initial
            condition, only relevant for computing pseudotime.