> > How I do change this equation (A = A+1) to be
> > LabVIEW Block diagram. Please exsample. Thank you.
>
> This is how I do it;
>
> Assuming you have defined 'A' as a numeric control (or indicator) then
> you can create a local variable for it. Right Click on the 'A' Control's
> symbol on the block diagram> create>local variable. You should see a new
> rectangle representing the local variable.
>
> Then
> feed the 'A' Control symbol into an ' +1' increment symbol (get from
> the numeric or arithmetic palette I think). Feed the output from this
> into the local variable for 'A' that you created as above.
>
While this will work, and is a direct translation, it is hopefully
not what you will be doing very often. This -- read local, modify,
write local
-- is what you might do if the code needs to update the
user interface.
Another translation is to take the value on a numeric wire. If the
value of the wire is A, then drop a numeric increment node, wire
the A wire to the left, and from the right side comes A+1. Now
wire the value to wherever it is needed.
This may not seem like much of a big deal, but if these literal
translations are applied too often, the LV diagram ends up being
lots of small read, modify, write code snippets that then need
to be sequenced. The writes are often made to an open panel which
needs to redraw things, and that takes thousands of times longer
than updating the variable. Basically, too much of this leads to
a diagram that is hard to modify, hard to debug, hard to read, etc.
Greg McKaskle
