wrong function plot different than wolframalpha

I wrote this code to plot a function

 y=-1:0.05:15;
 yprim= (0.75*y)-(0.05*y.^2)-((1.5*y.^3)/(1.25+y.^3));
 plot(y,yprim)
 hold on
 grid on 
 xlabel('y');
 ylabel('dy/dt');
 title('plot of function(1) with b=0.05');

it keep giving me the wrong plot can i have some help

[dpb]

Well, what do you think is wrong? It pretty much is what you coded; now perhaps that isn't what you really intended but we can't tell that with nothing else to go on...

Answer 1

[the cyclist]

I'm guessing you meant

   yprim= (0.75*y)-(0.05*y.^2)-((1.5*y.^3)./(1.25+y.^3));

Notice the ./ where you just had /

[dpb]

Good catch--I thought I had looked for that but missed it not being there...

[MAJED]

Oh... yes, thanks your right, it worked