Accessing data within astructure

Hello,

I am trying to access data from a part of a structure, which I have not implemented myself.

It looks like:

>> whos
  Name          Size            Bytes  Class     Attributes
  anotace       1x1              2648  struct

then:

anotace.borders
ans =
1x5 struct array with fields:
    Y
    H
    type
>> anotace.borders.Y
ans =
  106.0000  106.0000  164.5000  164.5000
  685.2500  733.2500  733.2500  685.2500
ans =
  368.5000  368.5000  440.5000  440.5000
  604.2500  661.2500  661.2500  604.2500
ans =
  351.5448  351.5448  421.5945  421.5945
  461.3955  521.8930  521.8930  461.3955
ans =
  356.3209  356.3209  432.7388  432.7388
  306.9677  369.0572  369.0572  306.9677
ans =
  337.2164  337.2164  423.1866  423.1866
  192.3408  252.8383  252.8383  192.3408

I would like to access anotace.borders.Y and use its data as an array of arrays(each ans as one array). When I try to assign its value I only get the first ans into my new variable.

Thanks for help.

Answer 1

[Amit]

you can access each array as anotace.borders.Y{i} where i is the i'th array in the structure.

[Amit]

Also, lets say you're try to create variables in a sequence like val1, val2 and blah ..

you can do something like

for ii = length(anotace.borders.Y)
   eval(['val' num2str(ii) '=anotace.borders.Y{' num2str(ii) '}']);
end

[Jan]

Thanks for answer, I tried it, but I get:

>> anotace.borders.Y{1}
  Field reference for multiple structure elements that is followed by more
  reference blocks is an error.

Also somewhere Matlab stated that my anotace.borders.Y is type 'double' which I don´t understand in respect to the output I have posted above.

[Amit]

My bad. anotace.borders is the struct with fields Y. Try this. This will work.

for ii = 1:5
   eval(['val' num2str(ii) '=anotace.borders(' num2str(ii) ').Y']);
end

[Jan]

@Amit: Using EVAL to create variables dynamically is a very bad programming practize and there is always a better solution.

Answer 2

[Jan]

data = {anotace.borders.Y};
data{1}
data{2}