Extract matrix from vector of .mat file

Dear all, According to the following code:

i=load('138078.mat')

i = 

      imageLabelCell: {1x6 cell}
       subjectIDList: [1105 1107 1108 1112 1116 1124]

>> i.imageLabelCell

ans = 

    Columns 1 through 5

      [481x321 double]    [481x321 double]    [481x321 double]    [481x321 double]    [481x321 double]

    Column 6

      [481x321 double]

I want to extract the 1st column of i.imageLabelCell which is a matrix 481x321 , Could anyone help me please ?

Answer 1

[per isakson]

Try

i.imageLabelCell{1}(:,1)

[Ynne]

Great Thanks a lot :)

it is i.imageLabelCell{1}(:,:)

[per isakson]

You write extract the 1st column of i.imageLabelCell which is a matrix 481x321 and it is i.imageLabelCell{1}(:,:) I'm missing something.

i.imageLabelCell has six cells each with one matrix. Thus there are altogether six 1st column. Maybe, you are looking for

cell2mat( cellfun( @(c) c(:,1), i.imageLabelCell, 'uni',false ) )

Matlab (R2016a) isn't smart enough to understand

>> [i.imageLabelCell{:}(:,1)]
Expected one output from a curly brace or dot indexing expression, but there were 3 results. 
>>