I am not able to get a line to appear on my graph?

clear all;

radius = 6378:50000; force = (3.986e5/(6378.^2));

figure plot(radius,force); axis([0 50e3 0 10]) xlabel('r(km)'); ylabel('F(m/s)');

Answer 1

[Image Analyst]

You had force just as one single number, not a list of forces for each radius. Try this:

radius = 6378:50000;
force = 3.986e5 ./ (radius .^ 2);

figure
plot(radius,force, 'b-', 'LineWidth', 2);
% axis([0 50e3 0 10])
xlabel('r(km)');
ylabel('F(m/s)');
grid on;
title('force vs. radius', 'FontSize', 20);

[Rachel Bauer]

Thank you very much!