For loops with if statements

Question

John Woods 2020-6-13

0
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https://ww2.mathworks.cn/matlabcentral/answers/547425-for-loops-with-if-statements

回答： Star Strider 2020-6-13

I have a for loop that I am trying to use to calculate the temperature at different elevations. It goes through the first if statement fine but after that, it stops. This is what I have:

e=0:200:55000;

for i=1:length(e)

if e(i)<=11000

T(i)=(-71.5/11000).*e(i)+15

elseif 11000<e(i)<20100

T(i)=-56.5;

elseif 20100<e(i)<32200

T(i)=(12/12100).*e(i)-76.434

elseif 32200<e(i)<47300

T(i)=(42/15100).*e(i)-134.063

else

T(i)=-2.5

end

What is wrong with my elseif and else statements?

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Answer 1

Star Strider 2020-6-13

0
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https://ww2.mathworks.cn/matlabcentral/answers/547425-for-loops-with-if-statements#answer_450462

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The if conditions can only be evaluated as paired comparisons in order to get the result you want.

Try this:

e=0:200:55000;
for i=1:length(e)
    if e(i)<=11000
        T(i)=(-71.5/11000).*e(i)+15;
    elseif (11000<e(i)) & (e(i)<20100)
        T(i)=-56.5;
    elseif (20100<e(i)) & (e(i)<32200)
        T(i)=(12/12100).*e(i)-76.434;
    elseif (32200<e(i)) & (e(i)<47300)
        T(i)=(42/15100).*e(i)-134.063;
    else
        T(i)=-2.5;
    end
end