# The plot was not out correctly

2 views (last 30 days)
Samantha Pham on 22 Sep 2020
Commented: Samantha Pham on 22 Sep 2020
Hi, this is the codes i have for the problem but somehow the plot was not out correctly like the example output.
Power = input('Enter the power rating of the lamp bulb [W]: ');
Time = input('Enter the time at which to calculate brightness [microseconds]: ');
I = 15 .* Power .* (1 - (1.40.*(exp(1)).^(-Time)) .* sin(1.43.*(Time) + pi./4));
fprintf('The brightness of the %d-Watt lamp will be %3.2f lumens at %d microseconds.\n', Power, I, Time);
Surge = input('Enter the time the surge starts [microseconds]: ');
I = Brightness(Power, Time, Surge);
Surge = 10 .* Power .* exp(1).*(-1) .* sin(1.43./2);
fprintf('The brightness of the lamp will be %3.2f lumens at\n %d microseconds, after factoring in the power surge.\n', I, Time);
Time = [0 : 0.01 : Time];
I = Brightness(Power, Time, Surge);
figure(1)
plot(Time, I, 'ro', 'LineWidth', 3);
title('Brightness of Lamp over Time');
xlabel('Time (t) [microseconds]');
ylabel('Brightness (I) [lumens]');
grid on

Adam Danz on 22 Sep 2020
My outputs:
Your Brightness may not be doing whatever it does in the demo you're following. For starters, in your comment from previous question you mentioned that the inequality should be flipped. But there's more to it than that.
Alternatively, the images in the demo might be incorrect.
Samantha Pham on 22 Sep 2020
so, this is the task that i did on Matlab but submit in Zybook. Mainscripts and the question i asked the first time is not on the same assignment. What i mean is, i write the brightness function in one page, and i write the whole script on another page. On that page, all the function are coded correctly by the professpor, so even if i did wrong on the brightness function, it doesnt really matter on the mainscript. I hope it makes sense.
Yes, i have same graphs as you, but somehow the sample output from professor gives different and i honestly dont know where.
Below is the whole assignment description. Thank you!
Samantha Pham on 22 Sep 2020
Yes, maybe you're right. The sample outptut can be wrong