I'm trying to create three curves, but my plot is blank

mi = (2814:1000:19781);
c = 2080;
c(2) = 1580;
c(3) = 2580;
v = c*log(19781/2814);

figure(3)
plot(mi,v);
hold on
plot(mi,v,'.m');
hold on
plot(mi,v,'-');
xlabel('kg')
ylabel('m/s')
title('Q9 plots')
legend('c=2080','c=1580','c=2580')

[Rik]

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Answer 1

[KSSV]

Code looks meaning less though.

mi = [2814 1000 19781];
c(1) = 2080;
c(2) = 1580;
c(3) = 2580;
v = c*log(19781/2814);
figure(3)
plot(mi,v);
hold on
plot(mi,v,'.m');
hold on
plot(mi,v,'-');
xlabel('kg')
ylabel('m/s')
title('Q9 plots')
legend('c=2080','c=1580','c=2580')