multiple loop and produce infinite loop

Question

Khairul Nur 2019-10-25

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评论： Khairul Nur 2019-10-25

hi, i have trouble using while loop. Where should i put the j inrement? i try fews times but infinite loop. Thanks in advance.

k = 4
j = 1
i=1
    while j <= k
        for n = i:40
            if (G(i,11)) == j
                mean = sum(G(i:10))/length(G)
                i=i+1
                break
            end
            %j=j+1 
        end
        %j=j+1
    end 

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Guillaume 2019-10-25

编辑：Guillaume 2019-10-25

What is the code meant to be doing?

Note that using length on a 2D matrix is asking for a lot of trouble. Is that length supposed to return the number of rows or the number of columns (note that it can return either depending on the actual size of G)

And naming a variable mean is also a very bad idea since it prevents you from using the mean function.

Is the switching from 2D indexing (in G(i, 11)) to linear indexing (in G(i:10)) on purpose or a major error?

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Answer 1

adeq123 2019-10-25

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在 MATLAB Online 中打开

This one works for me:

G = 100:1:1000;
k = 4;
j = 1;
i = 1
    while j <= k
        for n = i:40
            if G(i,11) == j
                mean = sum(G(i:10))/length(G)
                i = i+1
                break
            end
            %j=j+1 
        end
        j=j+1
    end 

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adeq123 2019-10-25

The j is incremaneting at the end of while loop. During the last iteration it is increament to 5 but the loop is not executed since entrance criteria is not met.

You can also do this one:

G = 100:1:1000;
k = 4;
j = 0;
i = 1
    while j < k
    j=j+1
        for n = i:40
            if G(i,11) == j
                mean = sum(G(i:10))/length(G)
                i = i+1
                break
            end
            %j=j+1 
        end
    end 
    