Hello!

Please note that when I reproduce your code (R2014a), I have the following error message:

Error using dataset/ismember (line 23)

A and B must both be dataset arrays.

Did you somehow define dataset before?

You do not provide information about the arguments of "ismember", without which one can only speculate about the cause of the problem! At any rate, look into "dataset" and its relationship to "data"...

The problem is that the function 'ismember' compares two arrays and returns logical indices if the data in one array is found in the other. There are two arguments for the function 'ismember', i.e Lia = ismember(A,B). What you wrote n the code doesn't make sense, and the error is probably related to the fact you put 'data' in as a string.

You gave no context for what you were trying to do so i'm only guessing, but I suspect what you are trying to do is compare the columns of the matrix 'meas' to see if one entry in the first column appears in the second column. If you are then try the following:

%%%%

% Load the data

load fisheriris meas

groups = ismember(meas(:,1), meas(:,2));

Hopefully this is what you wanted,

Cheers

I think your mistake is identification of dataset before use it at ismember function.

1.Maybe lack of info. about function 'ismember'

2.Misunderstand of "dataset"

3.Hoping more context show to us...

ps. Ric Porteous answered diligently.