Code that makes matlab jumping loops without fininishing the remaining iterations.

Question

BdS 2019-4-3

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评论： BdS 2019-4-10

Hi,

I have got the following 2 loops:

for d=1:nDates %loop over rebdates 
    for r=1:nRebDates
        ind=ismember(PortMembers,rawPortData{d}.PORTFOLIO_MPOSITION{1}(:,1));
        PortPositions(d,ind)=cell2mat(rawPortData{r}.PORTFOLIO_MPOSITION{1}(:,2));
    end
end

I would like that everytime when one iteration from loop r=r:nRebDates is concluded matlab jumps directly to the first loop d=1:nDates instead of first complete all iterations in loop r=r:nRebDates.

(break does not work as I do want that iteration r=r:nRebDates continues but only after matlab goes through d=1:nDates for a 2nd,3th, 4th... time)

(continue does not work as well as I do want a second iteration of r=r:nRebDates but only after matlab goes to the first loop d=1:nDates)

--> actually is as when I would tell Matlab: after the code line PortPositions(d,ind)=cell2mat(rawPortData{r}.PORTFOLIO_MPOSITION{1}(:,2)); go to d=1:nDates

Do you have any hints?

Thank you in advance.

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Answer 1

Bob Thompson 2019-4-3

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I'm not entirely sure I understand what you're asking for, but it seems like you want to run all iterations of the d loop with the first r value before proceeding to the second r value.

If this is the case, then why don't you just reverse the order of the two loops?

for r=1:nRebDates 
    for d=1:nDates %loop over rebdates
        ind=ismember(PortMembers,rawPortData{d}.PORTFOLIO_MPOSITION{1}(:,1));
        PortPositions(d,ind)=cell2mat(rawPortData{r}.PORTFOLIO_MPOSITION{1}(:,2));
    end
end

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Bob Thompson 2019-4-9

Per your other comments, it sounds like you're just trying to loop through both sets of values at once. To do that you can just use one loop.

r = 1:nRebDates;
d = 1:nDates;
for i = 1:length(r);
    ind=ismember(PortMembers,rawPortData{d(i)}.PORTFOLIO_MPOSITION{1}(:,1));
    PortPositions(d(i),ind)=cell2mat(rawPortData{r(i)}.PORTFOLIO_MPOSITION{1}(:,2));
end

This will run into problems if your r and d values are of different sizes, but otherwise it should work fine.

BdS 2019-4-10

Thank you for your answert. Yes, r and d values are of different sizes.

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Answer 2

BdS 2019-4-4

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Thank you for your answer. I wasn't clear.

Here is the procedure I woul like:

1) First iteration r

2) First iteration d, excecute code (ind=...; PortPositions...)

3) JUMP to SECOND iteration r

4) go on to SECOND iteration d, excecute code...

5) JUMP to THIRD iteration r

6) go on to THIRD iteration d

...(and so on)

I hope that I was clear this time. I think that these kind of questions arrive a lot... specially for programmers who write codes in other programs . (for which go to command exists)

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BdS 2019-4-8

In the meantime I was able to solve this question...

However, I would like that someone from matlab takes this question and gives me/us/=matlab users some powerful solutions as I think that this kind of questions arise by other users.

thanks in advance.

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