Indexing into a matrix to create a plot
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I would like to store Tskin for all t values and then use indexing to create a plot. How do I accomplish this?
Tambient = 20; % C
Tfilm = (T + Tambient)/2;
T = 29;
for t = 1:1:10
k_air_2 = 0 * (2.4131 + 0.0078 * T) * 10^-2; % W/m*C = 0
k_cotton = 0; % because long sleeve
rho_air = 1.2893 - 0.004 * Tfilm; % kg/m^3
mu_air = (0.0047 * Tfilm + 1.7164) * 10^-5; % kg/m*s
k_air_ambient= (2.4131 + 0.0078 * Tfilm) * 10^-2; % W/m*C
Re = Diameter_forearm * V * rho_air / mu_air;
h_air = (k_air_ambient/Diameter_forearm) * (0.3 + ((0.62 * Re.^.5 * Pr.^.333)/((1 + (0.4 * Pr)^.667).^.25))*(1 + ((Re/282000).^(5/8))).^.8) % J/s*K*m^2
Uskin = (k_air_2/thickness_air) + (k_cotton/thickness_shirt) + (h_air) % J/s*K*m^2
Uambient = (k_air_ambient/thickness_air) + (k_cotton/thickness_shirt) + (h_air)
old_Tskin = T
Tskin = [(T * Area * Cp_air * rho_air)/(t-(t-1)) + Qgen + (Uambient * Area * Tambient)]/((Area * Cp_air * rho_air / ((t-(t-1)))) + Uskin * Area);
T = Tskin
Tfilm = (T + Tambient)/2;
fprintf('Your frontal forearm temperature is %.2f C after %d seconds ' ,Tskin,t)
dT = old_Tskin - Tskin
if dT > 0.007
display('Your forearm probably feels cold')
elseif dT < -0.005
display('Your forearm probably is probably feeling hot')
else
display ('Your forearm feels comfortable')
end
end
2 comentarios
Ameer Hamza
el 29 de Mzo. de 2020
Several variables in your code are not defined. Please specify the values of all variables.
Respuestas (1)
MaryD
el 29 de Mzo. de 2020
you can just try
T_skin(t)= [(T * Area * Cp_air * rho_air)/(t-(t-1)) + Qgen + (Uambient * Area * Tambient)]/((Area * Cp_air * rho_air / ((t-(t-1)))) + Uskin * Area);
inside the loop.
then outside the loop
t=1:1:10
plot(t,T_skin)
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