'Computes the parameters depending on :math:`\lambda`. It needs to
be called again if :math:`\lambda` changes during evolution.
:param params: A dictionary of the manually set parameters.'

def computeParams(self, params):

    self.lambda_ = params.get('lambda_', 1)
    self.d = params.get('d', (1.0 + (self.dim / (2.0 * self.lambda_))))
    self.ptarg = params.get('ptarg', (1.0 / (5 + (sqrt(self.lambda_) / 2.0))))
    self.cp = params.get('cp', ((self.ptarg * self.lambda_) / (2 + (self.ptarg * self.lambda_))))
    self.cc = params.get('cc', (2.0 / (self.dim + 2.0)))
    self.ccov = params.get('ccov', (2.0 / ((self.dim ** 2) + 6.0)))
    self.pthresh = params.get('pthresh', 0.44)
