labintro.txt

LABTITLE=: 'Introduction to Labs'
LABCOMMENTS=: 'This is used for comments'

NB. =========================================================
Lab Section Introduction
A lab is a series of sections.

A section starts with comments (such as these), optionally
followed by J sentences which are automatically executed in
the J session.

Select menu Studio|Advance, or use the corresponding shortcut
key, to advance to the next section.
)
i.5         NB. automatically executed
+/\i.5      NB. automatically executed

NB. =========================================================
Lab Section Normal Session
Other than the automatic execution when you advance to the
next section, this is a completely open and normal J
session.

Between sections you are in control and can use the J system
as normal. You are encouraged to experiment by entering your
own J sentences while going through labs.

You can edit and re-enter any J sentence by moving the cursor
up to the sentence, and pressing Enter to bring a copy down
to the current line.
)
a=: i.7 NB. automatically typed and executed

NB. try your own sentences here, then advance to the
NB. next section.

NB. =========================================================
Lab Section Screen Width
The horizontal line shown in the J session is the recommended
minimum screen width. If necessary, resize the window so that
all the line is visible.
)

NB. =========================================================
Lab Section
You can create windows while using a lab. However, if a
window is active, then any shortcut key will signal an event in it.
Therefore you should click in the J session to give it focus
before using a shortcut key to advance.
)

NB. =========================================================
Lab Section Titled Sections
Some lab sections are titled and the title appears in the
line that starts the section.
)

NB. =========================================================
Lab Section
Other lab sections are simply a continuation and are titled
as such.
)

NB. =========================================================
Lab Section Labs Jump...
Some labs are in chapters that can be read in any order.

Menu command Studio|Chapters... brings up a dialog that allows
you to jump to specific chapters.

Some labs require that they be run in order from the
beginning to the end, and do not allow you to jump between
chapters.
)

NB. =========================================================
Lab Section Completely Open!
There is no specific way to end a lab.

You are in normal J and at any time you can close J, or use
Studio|Labs... to select another lab, or even just get back
to work.
)

NB. =========================================================
Lab Section Lab Author
The Lab Author system available from menu Studio|Author... allows you to build or edit labs.

To experiment, select Studio|Author... and open up the lab system/author.ijt.
)