#1. feladat: f(x) = 1.5log(x/2)−2 (0,4]-en x = seq(0,4,0.1) # x = seq(from=0, to=4, by=0.1) # lusta megoldas, ha benne hagyjuk a 0-t, a szamolt ertekek NA, # es kimaradnak az abrazolasbol # alternativ: seq(0.1,4,0.1) y1 = log(x) y2 = log(x/2) y3 = 1.5 * y2 y4 = y3-2 plot(x,y1,type="l",ylim=c(-7,1.5)) lines(x,y2,col="blue",lty=4) lines(x,y3,col="purple") lines(x,y4,col="red",pch=5,type="o") legend(2,-4,c("log(x)","log(x/2)","1.5log(x/2)","1.5log(x/2)-2"), lty=c(1,4,1,1),pch=c(NA,NA,NA,5),col=c("black","blue","purple","red"))