Draw realizations from GPs and predictive means and uncertainty intervals, that is $,$redo all the plots below by yourself, and generate the codes in matlab.

plots explanation:

Figure $5\mathrm{.}1$: In color, realizations drawn from GPs and predictive means and uncertainty intervals in black and gray, respectively. On the left, realizations for GPs$.$ On the right, GP realizations drawn conditioned with $3$ data points denoted by black circles. From top to bottom, the GPs are zero$-$mean with a squared exponential kernel, zero$-$mean with an exponential kernel, and linear$-$mean with a squared exponential kernel. Photo and text by Teemu H$$rk$$nen