How to access a particular array from a structure of arrays saved in a .mat file without loading the entire mat file

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Nadia A
Nadia A 2016-10-5
编辑： Nadia A 2016-10-10
Hi
I have a .mat file which contain a structure which in turn has many fields and large data arrays. Sample file shown below:
y_struct = struct('yval',[],'time',[]);
y_struct.yval = struct('tag',{'y1value','y2value','y3value'},'data',{[],[],[]}); % Defining structure to store the y array
% and its deviations
y_struct.time = t;
y_struct.yval(1).data = input;
y_struct.yval(2).data = y_struct.yval(1).data + 0.5;
Load command will save the entire mat file in memory. In my application, I want to access data fields with a particular tag(y_struct.yval(1).data). Is there a way to directly access this array element without having to load the entire .mat file? I read that using a matfile object we can access mat file elements but is it possible to access array index?

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KSSV
KSSV 2016-10-5
编辑：Walter Roberson 2016-10-5
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Nadia A
Nadia A 2016-10-10
编辑：Nadia A 2016-10-10
It says field cannot be accessed. The mat file contains 3 (1x4) structures. tag1,tag2,tag3(each of dimension 1x4). When I try to access data field of tag1, it shows error
'Cannot index into 'tag1' because MatFile objects only support '()' indexing'

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