function returns double instead of structure

I wrote a function that loads several CSV files with signal data into a stucture:

dataOut.CSV 1-5.signalchannel 1-12.signaldata/detectionpoint

I 've put a breakpoint to check the contents at the end of the function (everything checks out), before returning dataOut as an Output argument to the main function.

But when i check the data in the main function, the structure is replaced by a double, only containing the number 5 (number of CSV files I load).

How do I prevent this from happening and get the wright data returned?

Any help would be greatly apreciated. Thank you.

[Walter Roberson]

I think we will need to see some code. The calling line, the header line for the function, the assignment to output.