  We present the results of measurements of two-particle angular correlations
between trigger particles reconstructed in the ALICE Forward Muon Spectrometer
($-4.0 < \eta < -2.5$) and associated particles reconstructed in the central
barrel detectors ($|\eta| < 1.0$) in p--Pb collisions at a nucleon-nucleon
center-of-mass energy of 5.02 TeV. At low transverse momentum
($p_{\mathrm{T}}$), the reconstructed trigger particles mainly originate from
weak decays of primary pions and kaons, whereas at high $p_{\mathrm{T}}$, they
originate mainly from the decay of heavy-flavor particles. The ridge structure
elongated in the $\eta$-direction, discovered recently in p--Pb collisions, is
found to persist to the pseudorapidity ranges studied here. The second-order
Fourier coefficients of muons are extracted after subtracting the correlations
obtained in low-multiplicity events from those in high-multiplicity events. The
ratio of coefficients in the Pb-going and p-going directions is presented as a
function of $p_{\mathrm{T}}$, and the coefficients are observed to have a
similar $p_{\mathrm{T}}$ dependence in both directions with the Pb-going
coefficients larger by 16$\pm$6\%. The results are compared with calculations
from a multi-phase transport model.
