I want to plot phase portrait for 4 dimension. help me

4_equation_phase_portrait.mw

thank youvery much

i want  your solution  procedure in Maple and get the best fit for the coefficients, r anda k.  i want
plot the data and the y curve together on the same graph to visualize the fitting. For the
data  use blue circles while for the y curve, use red solid line style. Use the leastsquare. thank you verymuch

estimasi_par_logistik.mw

in phase portrait 3d , i use 4 initial condition, How  can I draw each initial condition in diferent colour. it very helpfull so i can see the moving of each IC. Thank you