# How do I plot outside temperature versus time in Matlab?

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Jessica Poulin on 25 Sep 2019
Commented: KALYAN ACHARJYA on 25 Sep 2019
Hello,
I'm not sure how to graph the following code in Matlab (Temperaure over 24 hour period should look sinusodal):
for t = 1:24
T(t,1) = (((Tmax - Tmin)/2)+((Tmax - Tmin)/2) * sin(((t - 9)/12)*Pi));
Thank you!

Jessica Poulin on 25 Sep 2019
ideally the graph would have the temperatures at every hour directly on it, but it will be used just to demonstrate temperature flucuations during the day and not for mathematical purposes.
rough93 on 25 Sep 2019
Gotcha! See my answer below. If you want to start from midnight instead of mid day, change the +3 to -9.
KALYAN ACHARJYA on 25 Sep 2019
Where is temperature data to plot across time hours?

Kevin Phung on 25 Sep 2019
Edited: Kevin Phung on 25 Sep 2019
no for loop needed.
Tmax = 310;
Tmin = 298;
t=(1:24)'; % transposed if you want a column vs row
T = ((Tmax - Tmin)/2) + ((Tmax-Tmin)/2)*sin((t-9)/12*pi)
figure
plot(T)

rough93 on 25 Sep 2019
Edited: rough93 on 25 Sep 2019
clc; clear
Tmax = 310; % Maximum daily temperature (3pm)
Tmin = 298; % Minimum daily temperature (3am)
x = 1:24;
Graph = 12*sin(((x+3)*pi)/12);
plot(Graph)
This assumes you start at mid day.