The function is meant to be used in a bivariate SVAR with two-demand and supply-shocks. The function orders shocks based on the impact matrix in such a way that the supply shock (+/-) followed by the demand shock (+/+).
(h+1) x 2 matrix of IRF proposal from the QR rotation of the B matrix with BB' = Sigma (reduced-form residual covariance matrix).
matrix of the same dimension in case shocks could be ordered or NULL in case shocks could not be identified
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