I have a matrix of values, but get an error when applying the matrix to a function, that the matrix is not an Array

I have made up a number of columns of data (including columns of zero data) and saved the output into a variable, which when I display it, looks like a matrix, as I wish it to.

When I try to apply the matrix to a function I get the error:

??? Attempt to reference field of non-structure array.

I am aware that this question has been asked many times, but have not seen a solution that I understand.

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The code I used to generate my matrix was:

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fid = fopen('u001_s01_sign_ds2-tb-0c_03.svc','r'); 

data = textscan(fid,'%f %f %f %f %f %f %f','HeaderLines',1); 

fclose(fid); 

B=[data{3} data{1} data{2} data{7} data{4} data{5} data{6}];

x=zeros(length(B),1);

D=[data{3} data{1} data{2} data{7} x data{4} x x x data{5} data{6} x x x x];

So I am accessing data from a file, rearranging the columns and adding in columns of zero. This then puts the data in the right format for the function to work:

>>C=myfunction(D,1)

The function structure input is as follows:

MYFUNCTION(SAMPLE_POINTS,SEGMENTATION_METHOD)

Where segmentation=1 or 0.

When I checked to see what type my variable D was I got the following:

>> whos D

    Name        Size            Bytes  Class     Attributes

    D         150x15            18000  double

Can anyone provide any insight as to why Matlab says that I am trying to reference a field of non-structure array when I type myfunction(D,1)?

[Tom]

is the error message at a line in the function?

[Walter Roberson]

We probably need to see the code for myfunction