Error using plot Invalid first data argument. How i can solve it!?
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Sainath Varikuti on 13 May 2015
Check the values of the 'flow' variable in the MATLAB Workspace Window.
Walter Roberson on 13 May 2015
At that point in your code, "flow" is not a variable, so it is being interpreted as a call to the routine named "flow", but you are not passing arguments into that call.
You should check the variable names you are using; you will find that you assigned your data to some other name, or the place you assigned it is not in the same scope as where you are trying to use it.