PLOTTING it h h

[KSSV]

You need to read about plot. But in the above do you have any array?

[John D'Errico]

It seems you might want to plot temperature, as a function of time? A plot is just a figure that shows two variables x and y, plotted against each other. So in this case, time is the x axis, temperature the y axis. So where have you created the time and temperature variables to plot?

[KSSV]

Don't attach your code as a image snippet. Copy the code here, so that people can copy and help you in case they have idea on your problem/ questions.

[Stephen23]

Original question by Mark Edison Arzobal retrieved from Google Cache (complete with SHOUTING):

"PLOTTING NEWTON'S LAW OF COOLING"

HOW CAN I PLOT THESE CODES IN MATLAB?

[Walter Roberson]

Mark Edison Arzobal : If you feel that the question is unclear, then as you are the person who posted the question, you should be the one that clarifies it.

Answer 1

[Alan Stevens]

I guess you want to plot Temperature as a function of time. Something like this perhaps:

% Data
T1 = 79.5;  % temperature at time t = t1 hours;
T2 = 78;    % temperature at time t = t1 + 1 hours
T0 = 98.6;  % temperature at time t = 0 hours
TS = 69;    % room temperature

% Newton's law of cooling function
T = @(t,k) TS + (T0 - TS)*exp(-k*t);

% Obtain k and t1
kt1 = log( (T0 - TS)/(T1 - TS) );
kt2 = log( (T0 - TS)/(T2 - TS) );
t1 = 1/(kt2/kt1 - 1);
k = kt1/t1;

% Plot temperature decay curve
t = 0:0.1:10; % times in hours
Temps = T(t,k);
plot(t, Temps), grid
xlabel('time [hrs]'), ylabel('temperatures [F]')

[Alan Stevens]

You should run it to see!

[Alan Stevens]

This means let t take the values 0, then 0.1, then 0.2, then 0.3, ... etc all the way up to 10. It sets up an array with t taking on values from 0 to 10 in steps of size 0.1. These values are then passed to the function T, which calculates values of temperature at each of those values of t.