clc
clear

x1= 0:0.01:3;
y1= 25*exp(0.5*x1);
y2= 40*1.7.^x1;
x2= logspace(-1,1,500);
y3= 15*x2.^0.37;
subplot(1,2,1), grid on
semilogy(x1,y1,x1,y2,'--')
subplot(1,2,2)
loglog(x2,y3), grid on