Nested for loop problem

Question

Justin Hayes 2020-5-9

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/524271-nested-for-loop-problem

回答： Ankriti Sachan 2020-5-12

time_range = 1:10

k_cotton = 0.04:0.02:0.08

for k = 1:length(k_cotton)

for t = 1:1:length(time_range)

insert multiple variables as a function of (t)

code.....

Q(k) = k_cotton(k) .* numbers

Tskin_forearm(t) = Q .* t .* Tskin_forearm(t-1)

code......

end

figure(1)

plot(time_range, Tskin_forearm)

grid on

xlabel('Time (seconds)')

ylabel('Temperature (Kelvin)')

legend('T skin .04','T skin .06','T skin .08')

title('Temperature of forearm over time')

end

I believe that when running the nest loop, values from k = 0.04 are being carryed over and used to calculate values for k = 0.06. I think this is because Tskin_forearm(t-1) from k =0.04 is being used to begin the k = 0.06 loop. How do you prevent the values from being used in the second and third part of the nest loop? Thank you.

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Answer 1

Ankriti Sachan 2020-5-12

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/524271-nested-for-loop-problem#answer_431941

From your query, what I understood is that the value of Tskin_forearm(t-1), calculated where k=1 and k_cotton=0.04, is being used in the second iteration of the external loop, where k=2 and k_cotton=0.06.

If this understanding is correct, then to solve your issue, you can probably keep storing the value of Tskin_forearm(t), in some variable completely outside the loops, immediately after the internal loop is completed for k_cotton=0.04. Also, reset the variable Tskin_forearm(t) before beginning the internal loop for k_cotton=0.06.