sin function gives straight line when plotting

when plotting

x = [0 50];

y1 = 0.25*x.*sin(x);

y2 = 0.25*x;

y3 = -0.25*x;

plot(x,y1,x,y2,'--',x,y3,'--')

i get a straight line for y1, it should be oscillating between y2 and y3. what am i doing wrong?

Answer 1

[Star Strider]

You are only plotting two points, at x=0 and x=50.

Try this instead:

x = linspace(0, 50);
y1 = 0.25*x.*sin(x);
y2 = 0.25*x;
y3 = -0.25*x;
plot(x,y1,x,y2,'--',x,y3,'--')