MATLAB: Can not plot, please help

plotplotting

x = 0:1:10
y = (15*x)/(4*x.^2-3*x+4)
plot(x,y)

why can't i plot this? please help me.

It is plotting, it's just only plotting a single point. The matrix division of a 1x11 vector by a 1x11 vector is a scalar.

ones(1,10)/ones(1,10)

You probably meant for element-by-element division

ones(1,10)./ones(1,10)

And thus your defintion of y:

y = (15*x)./(4*x.^2-3*x+4)

look at

doc vectorize

to avoid these issues in the future.

It should be

x = linspace(1,10,100);
y = (2./x).^3;
plot(x,y,'linewidth',4,'color','r')

x=-10:0.1:10 
Y=1./(x.^2)+8
plot(x,Y)