while or for loop

Question

Daryl Chua 2019-10-27

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/487686-while-or-for-loop

回答： Dinesh Yadav 2019-10-30

Please help me with this loop where i to get the highest value of mv1 and then stop the loop. After stopping the loop it must display the highest value and where (x) it got the value from.

x = 0;
mv=0;
mv1=0.00000000000001;
x1=x;
x2=x-L1;
x3=x-(L1+L2);
x4=x-(L1+L2+L3);
x1(x1 < 0) = 0;
x2(x2 < 0) = 0;
x3(x3 < 0) = 0;
x4(x4 < 0) = 0;
while mv<mv1
mv=mv1;
mv1=(((Ra/6)*((x1).^3))+((P1/6)*((x2).^3))+((M/2)*((x3).^2))+((P2/6)*((x4).^3))-((w/24)*((x1).^4))+((w/24)*((x3).^4))+(c1*x))/(E*I/1000.^2);
x=x+0.01;
end
fprintf('The highest deflection of the beam is %.4f mm at x=%.2f\n',mv1,x);

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Ni2 2019-10-27

What are L1, L2 and L3?

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Answer 1

Dinesh Yadav 2019-10-30

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/487686-while-or-for-loop#answer_398886

Assuming you know length of the sequence using for loop would be better as it would iterate over the entire sequence to find the maximum among the entire sequence. In this case here what if the point where the condition fails i.e. for some n-th iteration mv1<mv but after lets say k steps(i.e n+k overall steps) you have the value of mv1 thats a global maximum, the above while condition will fail to detect that. Therefore if you know the length of your sequence or the range over which you would like to find the maximum value I would recommend using for loop.