You can limit the number of samples using Head.

To see the results, add File Sinks wherever you want to save samples, and use an external program to view, or use something like the QT Vector Sync in the flowgraph if it works for your case.

If you are saving to a file, you do not need a Throttle, but if you're using one of the Instrumentation sinks, leave it in.

You may want to turn off "repeat" in the File Source if you only want to see the contents of the file once. File Source has an open() method that can be used (from Python) to open a new file, which might help.

As Marcus said, the more you say about what you're actually trying to do, the better people can help you.

- Jeff

On 09/12/2015 11:53 AM, Julio Hector Aguilar Renteria wrote:
My flow  graph is as follows:


Imagen integrada 1
I need to store until N samples (values) from file source,   then in the
Stream_to_Matrix Block are processed.   How can I check the input and
output from Stream_to_Matrix Block (see the Values) and  I need to
control the file source block . e.g  I need run, stop, etc

Thanks,


    Hi!

    You're still not giving us **any** context of what you're doing. We
    can't really guess what you want to achieve.
    Input data to what?

    In situations like this, I really like to ask people to draw (with a
    pencil on paper, really quick and dirty) a diagram of what they want to
    do in general, and explain each part of the diagram in an email! This is
    the fastest way, in my opinion, when describing systems that others
    don't know yet. Feel free to take a smartphone photo of that drawing or
    so, and post it here or to an online image hosting service (e.g.
    imgur.com <http://imgur.com>).

    Best regards,
    Marcus

    On 12.09.2015 00:39, Julio Hector Aguilar Renteria wrote:
     >
     > Hi , everybody
     >
     > How do they do ?
     > I want to store my  input data until a N value , then wait until they
     > are processed and then back again to store the next  N values
     >
     > Thanks
     >


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