How can I resolve this problem using vertcat on matrices for daily files to create a single matrix for the whole year?

Hello,

I am trying to create a single matrix that represents soil moisture data for an entire year. I have one file from each day that is 96x25 and is in a .dat format. I have been trying to upload the files and then concatenating them using the vertcat function but every time I get the error "??? Error using ==> vertcat The following error occurred converting from double to struct: Error using ==> struct Conversion to struct from double is not possible."

I don't understand what the problem is because I'm not trying to convert to struct but I'm guessing that this might be part of the vertcat function? I have found multiple entries discussing similar problems but none that have helped in resolving my problem. I have included part of the prompt I'm using below. Thanks for any help you can give.

Tyler

datfiles=dir('*.dat'); 
numfiles=length(datfiles); 

%Import the files

for k=1:length(datfiles);
  newData1 = importdata(datfiles(k).name);
  newData2 = importdata(datfiles(k+1).name);

      A = newData1; %Create matrix A, with all data from the file 
      B = newData2;
      C = [A; B];  %vertically concatenates matrix A to B
  end  if true
      % code
    end

Answer 1

[Thorsten]

importdata returns a structure, not a matrix;

   whos newData1

[Daniel]

using this command it says that newData1 is of class 'double' not struct

Answer 2

[Kye Taylor]

So, I'm guessing that newData2 is not a structure, in particular it is a double?

Perhaps try fixing your code by replacing the line that defines A with

A = newData1.data;

[Daniel]

I tried replacing this line and it gave an error saying 'attempt to reference field of non-structure array'. I was under the impression that the files were all in double after being imported, but am somewhat confused by this aspect. Sorry I can't give more information but I'm somewhat new to matlab. Let me know if I can give more details to help explain.

Each file is essentially the same, except for the second column which reflects the day of year (DOY). All I want is for it to start at DOY 1 and add each consecutive day's file until it reaches DOY 365. The desired result is a single file with all of this data in order.

[Kye Taylor]

So, is newData2 a double or struct?