Re: differentiation operator

• To: mathgroup at smc.vnet.net
• Subject: [mg100784] Re: [mg100645] differentiation operator
• From: "David Park" <djmpark at comcast.net>
• Date: Sun, 14 Jun 2009 05:37:47 -0400 (EDT)
• References: <004901c9e9e0\$a4ba7900\$ee2f6b00\$@net> <22643639.1244693328354.JavaMail.root@n11>

```Lim Cheung,

When I bring up the Classroom Assistant palette, go to the Calculator
Advanced tab, and press the 2nd button in the 5th row it pastes the partial
differential form in my notebook. This has the partial symbol with var as a
subscript and another box to enter the expr. If I fill x into the var box,
and x^2 into the expr box, and then press Shift-Enter, the entire expression
will evaluate to obtain 2x.

If you type x^2, select it, and then press the palette button, it will paste
the differential operator on the x^2. You will then still have to fill in
the x and use Shift-Enter.

Does this not evaluate properly for you? If not, there is some bug in your
installation and you should contact WRI.

True, this form does not look exactly like 'd/dx' but I would think it would
be good enough.

Or, perhaps you want a restricted paste button that already has the x filled
in. If so, you could use the following expression to create the button in

Defer@PasteButton[\!\(

\*SubscriptBox[\(\[PartialD]\), \(x\)]\[SelectionPlaceholder]\)]

You can create this statement by writing Defer@PasteButton[]. Then click in
the partial expression from the Classroom Assistant. Then fill var with x,
and fill expr with a selection placeholder (esc spl esc).  When you evaluate
that you will obtain a button that will paste the operator onto any selected
expression. You could make your own palette with the button by using
CreatePalette.

Otherwise, I don't really understand what your objective or problem is.

You could also try out the Notation package.

David Park

djmpark at comcast.net

http://home.comcast.net/~djmpark/

From: Chee Lim Cheung [mailto:CheeLC at sp.edu.sg]

Hi David Park

Thank you for your reply. I tried the d/dx operator (like what we see in
Calculus textbooks) in the Classroom Assistant palette but it seems to be
for display only. (Am i missing something here?) I guess the solution is to
format it to behave like a differentiation operator. Any ideas on that? We
would like d(f[x])/dx to function in the same way as D[f[x],x].

Thank you all for your suggestions.

Regards
Mr. Chee

Inactive hide details for "David Park" <djmpark at comcast.net>"David Park"
<djmpark at comcast.net>

"David Park" <djmpark at comcast.net>

10/06/2009 23:32

To

"'Chee Lim Cheung'" <CheeLC at sp.edu.sg>, <mathgroup at smc.vnet.net>

cc

Subject

RE: [mg100645] differentiation operator

I don't see why you say that the differential operator on the palette
doesn't work. If you paste it in a notebook and then fill in x and the
expression and then evaluate, it will work.

Otherwise, you could do something like:

d[x_] = Function[expr, D[expr, x]];

d[x][x^2]
2 x

David Park
djmpark at comcast.net
http://home.comcast.net/~djmpark/

From: Chee Lim Cheung [mailto:CheeLC at sp.edu.sg]

Hi All

My students have asked me whether it is possible to define the operator
df[x]/dx for differentiation rather than D[f[x],x]. The operator is
available in a palette but it does not seem to do anything other than for
display only.

Example: d/dx(x^2)=2x rather than D[x^2,x]=2x.

Am I missing something?

Thanks
Mr. Chee

```

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