i have loaded a time-series data (variable of 10000 rows and one column), and for that to estimate a transfer function i am getting the index error, please do help me

sys=tfest(data1,1,0)

Error using tfest (line 113)

Index exceeds the number of array elements (0).

[Walter Roberson]

How did you load the tfest variable?

What shows up for size(tfest) ?

If it is stored in a .mat file, use

whos -file FILENAME.mat

to check whether the variable is empty inside the .mat file.

[Mathieu NOE]

hello

to estimate a transfer function you need both input and output data

with only one of the two this is mission impossible

[Walter Roberson]

What is class(data1) ?

[Yashaswini]

iddata1

[Walter Roberson]

Please run this segment of debugging code and tell us the result.

OutputData = data1.OutputData;
if isempty(OutputData)
    fprintf('Stored OutputData is empty\n');
    output_size = 0;
elseif iscell(OutputData)
    fprintf('OutputData is cell\n');
    output_size = size(OutputData{1});
else
    fprintf('OutputData is numeric\n');
    output_size = size(OutputData);
end
disp(output_size)