PLOTTING it h h

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Mark Edison Arzobal
评论： Walter Roberson 2020-7-26
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Stephen23
Stephen23 2020-7-26
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
Walter Roberson 2020-7-26
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.

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回答（1 个）

Alan Stevens
Alan Stevens 2020-7-25
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]')
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Alan Stevens
Alan Stevens 2020-7-25
You should run it to see!
Alan Stevens
Alan Stevens 2020-7-25
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.

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