Ok, I added this exercice to react to some comments and reviews from the AppStores. (Note that I could answer reviews by giving a review to my own software, but I won't do that...)
Let's begin with a formula as simple as x^2.
With touchplot up to 2.1, you had to realize that this
formula is a power, more precisely the power of x to the
exponent 2, and you had to do this :
the principle of direct polish notation being indeed that
you write the operator before its arguments. (reverse
polish notation puts the operator after its arguments, so
on a RPN calculator, you would compose instead x,2 then
The same goes for a sum, a product, a quotient.
I don't suppose it would take a very long time for someone
who read the documentation.
That being said, things are now a bit different with
touchplot 2.2 (and subsequent versions of course), because
one can now do instead :
Difficult, hum ? (The old way is still possible, of
Now, suppose you want to enter exp(x)+x, you would indeed
have to do, before 2.2 version of touchplot :
because this expression is a sum, the sum of exp(x) and of
x. (It sounds complicated, maybe, but the graphical display
of the formula makes it quite easy to follow, after hitting
+, you get something like this :
■+■, then exp(■)+■, then exp(x)+■ then finally
You can still do this with versions >= 2.2 of touchplot,
but you might do as well :
Now, be aware that for little parts of your formula, you
still have to use polish notation, or use the selection
scheme introduced in TouchPlot 3.2. See the page about
the new 3.2 formula
If you take the time to do the little three more exercices
following this one, I think you'll have everything you need
to do some work, experiment, and learn with touchplot.
And if you read the documentation on this website, and did
the exercices, and still have a problem, fell free to send
me an email and ask for guidance.