I am getting a blank graph when I try to plot a while loop. I am not sure why. My code is below. Thank you MATLAB

%Surface Area (m^3)
SA=4.096e-6;
%Cooling rate goes from 20 to 100W
disp('Outputs')
CR=20;
hold on
while (CR<=100)
    HF=CR/SA;
    fprintf('Cooling Rate = %g Heat Flux = %g\n',CR,HF)
    CR=CR+10;
    plot(CR,HF,'c-','LineWidth',2)
end
hold off

Answer 1

[Adam Danz]

On each iteration of your while-loop CR and HF produce 1 coordinate but you're asking to draw a line which requres 2 coordinates.

Plotting within a loop is generally avoidable. You could collect your data within a loop and then plot it after the loop. Better yet, you don't need a loop at all.

%Surface Area (m^3)
SA=4.096e-6;
%Cooling rate goes from 20 to 100W
CR=20 : 10 : 100; 
HF=CR/SA;
plot(CR,HF,'c-','LineWidth',2)

Answer 2

[Walter Roberson]

You are plotting one point at a time but you have no marker specified.

MATLAB never deliberately joins points from different plot() calls.

You can specify a marker. Or you can save all of the points and plot them all after the loop. Or you can use animatedLine()