No lines on my graph

Hello,

I have gone through multiple of the post with similar problems without any luck. Can some one help? Why do no lines show on my graph?

% Assumened Values

Ti=20;

Tamb=38;

h=5.2;

d=1035; %density

c=3350;

k=0.62;

t=3600; %time in seconds

r=0.025; %radius

V=3/4*pi*r^3;

m=d*V

a= 2.3184*10^-5;

A=4*pi*r^2;

% for spherical system

Lc=r/3

%Biot Number

Bi= h*Lc/k

% Temperature after 60 minutes

T=Tamb+(exp((-h*A)/(m*c)*t)*(Ti-Tamb))

%plot T vs t

x=[0:100:3600]; %time on x-axis

plot(t,T), xlabel('time'), ylabel('Temperature'), title('Temperature vs Time')

Answer 1

[Star Strider]

I suspect that ‘t’ is supposed to be a vector:

t=0:3600; %time in seconds

and then using element-wise division in the ‘T’ assignment:

T=Tamb+(exp((-h*A)./(m*c)*t)*(Ti-Tamb));

and the plotted ‘T’ as a function of ‘t’ curve magickally appears!

[Yaneli Rubio]

I can't believe I missed that. Thank you so much!

[Star Strider]

As always, my pleasure!

No worries! I’ve done similar things and I’m certain others have as well!