How do I use multiple similar structures in a FOR loop?

I've been looking / studying web based documentation / artciles / blogs for 1 week but couldn't find a solution to my problem :[

I would appreciate if someone could help me with this issue.

Example of the problem:

my 1st structure (all is m1 x 1)

dmin1.Date
dmin1.Open
dmin1.High
dmin1.Low
dmin1.Close

my 2nd structure (all is m2 x 1)

dmin2.Date

etc. ...

where m1 ~= m2

the number of structures depends on some inputs, but let's assume there are just these two

What I need to do is call the appropriate structure in a for loop.

For simplicity let's assume I want to find out the length of each structure:

for i = 1 : number of structures (in my example 2)
  dates_length(i) = length(dmin"i".Date); % **
  % -----------------------
  % some code for execution 
  % -----------------------

end

** for the statement //dmin"i".Date// I need your help - don't know how to correctly write it so matlab will do what I want.

So after the for cycle ends, when I type dates_length in the command window the result should be:

dates_length = 

m1 m2

Hope I've explained my issue clearly enough. I'll appreciate any feedback which helps to solve this issue, also the one that might opose the technique I use for sampling the data ... (I've also read the FAQ that such a creation of variables / structures is not recommended, but I can't figure out any other way how to sample the data)

[Todd Flanagan]

Michal, I edited your question for clarity. Feel free to update it if you don't think I captured your real question.

Answer 1

[Walter Roberson]

Now, using structures is good -- just use structure arrays.

dmin(1).Date
dmin(1).Open

dmin(2).Date
dmin(2).Open

and so on. Then you would just be using length(dmin(i).Date) which you could even do without a loop by using

arrayfun(@(S) length(S.Date), dmin)

Please also see the FAQ about working with multiple variables

[Michal]

Thank you very much Walter, you've solved my problem !

structure arrays - a very elegant solution.

once again thanks a lot.

Answer 2

[Doug Hull]

See this similar question for an extensive answer.

http://www.mathworks.com/matlabcentral/answers/143-how-do-i-make-a-series-of-variables-a1-a2-a3-a10