Accessing data in sequential work space names and writing to matrix

Hello everyone,

I have a .MAT file from our DAQ unit that saves each data channel and header seperatly (Channel_i_Data = 40000x1 double) and (Channel_i_Header = 1x1 struct)

In this case i=47 different channels but can be more or less. I am trying to create a for loop that can access the n-th row of the 40000x1 double of each channel and input it into a matrix (essencially taking a snapshot of all the channels at the same time internal). I am able to load each channel and write them individually but I dont know how to make it progress through all of them in the for loop.

for k = 1:channels
    channel = sprintf('Channel_%d_Data',k);
    S = load(filename,channel);
    Var = S.Channel_????;  %   <-----issue is here
    Data(k,1) = Var(row,1);
end

Answer 1

[Fangjun Jiang]

Var = S.(channel); % <-----issue is here

[Armin Koehler]

Thank you so much! I could not find this simple answer anywhere!

[Fangjun Jiang]

It is called dynamic field names. Searching in doc should find it.

structName.(dynamicExpression)