help!!! with plot

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?

Answer 1

[Image Analyst]

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;

Answer 2

[Bhaskar R]

MATLAB operator "/" performs linear equation solver, apply dot elemetwise(./) division

clear;
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)

Answer 3

[KSSV]

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)

Element by element divison is needed.

/ is replaced with ./.