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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def getGradient(self,j):
 """ get rotated gradient for fixed effect i """

        i = int(self.indicator['term'][j])
        r = int(self.indicator['row'][j])
        c = int(self.indicator['col'][j])
        rv = -np.kron(self.Fstar()[i][:,[r]],self.Astar()[i][[c],:])
        return rv