Getting Started with Orange 03 Widgets and Channels Video Lecture - Orange

Today I'll show you some great functionalities
of Orange Data Mining widgets
and communication channels.
In Orange, there are several ways
to add widgets to the workflow.
a) click on the widget in the widget pane
and the widget will appear in the canvas
b) click and drag the widget onto the canvas
to place it exactly where you want it to
c) right click on the canvas and the widget menu will appear
Select the widget from there
or even better, start typing its name in the filter.
Select the widget and press Enter.
d) drag a communication channel from
the output of the file widget
and Orange will suggest the widgets you can connect your original widget to.
Remember, Orange will not allow you
to connect incompatible widgets.
To get more space for the workflow,
go to View and deselect Expand tool dock.
I for instance have the widget toolbox minimized at all times
and use the right click to add new widgets.
You can also tell Orange what kind
of data you would like to send
from one widget to another.
Here is a simple example.
We will use Iris data from our previous video.
I will first connect Scatter Plot
and Data Table to the File widget.
Let's see if the data was
received by the Scatter Plot.
Yes, it's here.
Let us also connect Data Table to
the Scatter Plot.
The idea is that I will select some
data instances in the Data Table
and these instances will be
highlighted in the Scatter Plot.
I will open Data Table and select some instances.
The widget is sending my
selections straight to the Scatter Plot.
See how Scatter Plot marks selected
instances?
I have indeed just created a visual data browser.
Now double-click on the link between
Data Table and Scatter Plot.
Orange correctly guessed that the
data from the Data Table
will be used as a data subset in the
Scatter Plot.
We can change that and remove
this connection by clicking on it.
Now we can drag a new line from
Other Data to Data Subset
and the plot will change.
All data instances other than
those selected in the data table
will be highlighted.
This is how you can define what is
communicated between widgets.
You don't need to do this often
as Orange matches the inputs and outputs automatically
or infers the right connections
from the order in which
you've added widgets to the workflow.
A right-click on the communication channel
allows you to remove the connection.
Today I've showed you the many ways to
add widgets to the workflow,
how to adjust the input and output of a widget,
and of course how to turn a few widgets
into a cool data browser.