MATLAB: Help!!! with plot

plot just a pointslash instead of dot slash

clear all
a=200;b=5;cm=10;cr=3;v=600;k=6;u=0.1;s=0.2;e=2;cp=2;t=1;
pr=1:10;
r=-(pr*u*(b*cm - a + cp*e*k + b*cp*e*t))/(8*v + 2*b*pr.^2*u - 2*b*cm*pr*u + 2*b*cr*pr*u - 2*b*pr.^2*s*u);
plot(r)
Why just plot a point, not a line?

Best Answer

Because you used slash (matrix division) instead of dot slash (element-by-element division). Try it this way:
clear all
a=200;
b=5;
cm=10;
cr=3;
v=600;
k=6;
u=0.1;
s=0.2;
e=2;
cp=2;
t=1;
pr=1:10;
r=-(pr*u*(b*cm - a + cp*e*k + b*cp*e*t)) ./ (8*v + 2*b*pr.^2*u - 2*b*cm*pr*u + 2*b*cr*pr*u - 2*b*pr.^2*s*u);
plot(r, 'bs-', 'LineWidth', 2)
grid on;
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