if( !require('phaseR') ){ install.packages('phaseR') library(phaseR) } my_yprime = function(t, y, parameters){ x = y[1] y = y[2] dy = numeric(2) dy[1] = 1 #dy[2] = ( sin(x)/(x+1.e-3) - 2*y )/(x+1.e-3) dy[2] = ( sin(x-pi/2)/(x-pi/2) - 2*y )/(x-pi/2) list( dy ) } #postscript("../../WriteUp/Graphics/Chapter2/chap_2_sect_1_prob_25_plot.eps", onefile=FALSE, horizontal=FALSE) diff_eq_params = c() flowField(my_yprime, x.lim = c(0, 1.5), y.lim = c(-6, 4), parameters = diff_eq_params, points = 21, add = FALSE) trajectory(my_yprime, y0 = c(0.0, -4.0), t.start=0, t.end = 1.5, parameters = diff_eq_params) trajectory(my_yprime, y0 = c(0.0, 0.2026424), t.start=0, t.end = 1.5, parameters = diff_eq_params) trajectory(my_yprime, y0 = c(0.0, 1.0), t.start=0, t.end = 1.5, parameters = diff_eq_params) #dev.off()