For loop inside structure

Question

Mohammed Hammad 2019-1-24

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编辑： Mohammed Hammad 2019-1-26

I have a structure called (level3) and inside it some fields (e.g x0, vx). each field is an array with some values as shown in the screenshot.

I would like to go through these fields values and multply them as follows:

x(1,1)*vx(1,1)

x(2,1)*vx(2,1)

x(3,1)*vx(3,1)

.... and so on.

so I got at the end 10 arrays of results of x

I tried to do it like this but I just got one array with the last value.

fields = fieldnames(level3);
for k=1:10
    x = [x0. * vx];
end

Thanks in advance

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Answer 1

Mohammed Hammad 2019-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/441367-for-loop-inside-structure#answer_358041

编辑：Mohammed Hammad 2019-1-26

I got the answer after many tries as follows:

for n = 1:10

x{n} = level3(n).x0. * (level3(n).vx)

end

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Stephen23 2019-1-26

编辑：Stephen23 2019-1-26

Those square brackets are superfluous. Get rid of them.

https://www.mathworks.com/matlabcentral/answers/35676-why-not-use-square-brackets

Note that your inner loop serves no purpose, because you do not use its loop index anywhere and none of its iterations depend on previous iterations, so the results of every of its iteration will get discarded except for the last one.

Mohammed Hammad 2019-1-26

Thank you for your notes. yeah I removed the inner loop and I got the desired results.

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Answer 2

Bob Thompson 2019-1-24

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https://ww2.mathworks.cn/matlabcentral/answers/441367-for-loop-inside-structure#answer_357927

fields = fieldnames(level3);
for k=1:10
    x = [x0. * vx];
end

If I understand this correctly you're trying to capture the array of multiplications (x0 .* vx) for all of the different elements of the structure. I believe that all you're missing then is either an index on x, or to concatonate the results of x with the previous values.

fields = fieldnames(level3)
x = [];
for k = 1:10
    x = [x;[x0.*vx]];
end

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Mohammed Hammad 2019-1-25

It works , thank you. but the answer is Double(50*1) and I want it 10 arrays, each array has different number of values. the length must be the same as x0 and vx arrays length

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For loop inside structure

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