I am not sure what exactly is causing the confusion, so I apologize in advance if something I write is already obvious.
First off, have you gone through this section of the doc? It shows hot to bring in time data into the tool.
Now, to address all the words in "real-valued double array".
As the screenshots show this data has to be an array of data type double (as opposed to single, int16, int32, uint64 or any other data type MATLAB supports).
Again, at the risk of stating the obvious, array means it has to be an array as opposed to other data type (structure, for example).
Finally, real-valued means that you cannot have any complex numbers in this array.
So, how do you figure out what is causing the problem: look at your variable that you are trying to enter as time vector in the Workspace. If it is an array of real-valued doubles, the words in the "value" column will say something like double.
HTH.
Arkadiy
