Import Data Error (Attempt to reference field of non-structure array)

This is my code:

%

E1 = importdata('shaker18.dat');

Data = E1.data;

FreqE1 = Data(1:end-1,2); %frequency (Hz)

AmpEA1 = Data(1:end-1,3); %amplitude of accelerometer (V)

AmpEH1 = Data(1:end-1,4); %amplitude of hammer (V)

%

When I go to import my data, I get an error saying "Attempt to reference field of non-structure array." I know how to import data because I've done it for other files. The data in the file looks fine. There are 4 columns and 23 rows and there is a value for each space, so I don't know what to do. All help is appreciated!

Answer 1

[Walter Roberson]

In the importdata documentation, have a look at "Import a Text File and Return Detected Delimiter". You can see there that in at least some cases, the data can be returned as a plain numeric array rather than a structure.

if isstruct(E1)
  Data = E1.data;
else
  Data = E1;
end