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. 2019 Apr 19;9(3):20180083. doi: 10.1098/rsfs.2018.0083

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© 2019 The Author(s)

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Figure 3. — Examples of phase shifted oscillations. (a) Dependency between f_l and f_h with t. (b–f) The high-fidelity function (the yellow curve) versus posterior means with 2 s.d. (dashed lines) of 5 compared methods with 10 high-fidelity data points and 100 uniformly distributed low-fidelity data points. (b) GP (Kriging) and low-fidelity data (the red-dashed curve). (c) Auto-regressive GP (AR1 or coKriging). (d) Nonlinear auto-regressive GP (NARGP). (e) GP in the higher-dimensional space with only delays (f_l(t), f_l(t − τ), f_l(t − 2τ)). (f) GP in the higher-dimensional space (GP+E), using (t, f_l(t), f_l(t − τ), f_l(t − 2τ)). (Online version in colour.)