Get Help

Turn on suggestions

Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for

- Community
- :
- PTC Mathcad
- :
- PTC Mathcad
- :
- Time derivatives

Options

- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Mute
- Printer Friendly Page

Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for

Highlighted
##

- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Notify Moderator

05-28-2013
10:50 PM

05-28-2013
10:50 PM

Time derivatives

In text books dx/dt and d2x/dt2 are universally written as x with one or two dots over the x. Is there any way to accomplish this in Mathcad 14?

Labels:

8 REPLIES 8

Highlighted
##

- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Notify Moderator

05-29-2013
07:46 AM

05-29-2013
07:46 AM

Re: Time derivatives

James McNabb wrote:

Unfortunately not. At leasat not the easy, natuaral way.

There are some discussions about this subject here and there is no real solution nor a development of the product in that respect. Evene worse in Prime one cannot even use the symbol for partial derivative!

You may be interested in

http://communities.ptc.com/message/50887#50887

Highlighted
##

- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Notify Moderator

05-29-2013
08:39 AM

05-29-2013
08:39 AM

Re: Time derivatives

The closest you can come is "cntrl F7" which gives you {x'} as a first derivative. Mathcad will recognize this as the first derivative; doing it twice gives the second derivative . . .

Highlighted
##

- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Notify Moderator

05-29-2013
09:25 AM

05-29-2013
09:25 AM

Re: Time derivatives

Fred Kohlhepp wrote:

But its only recognized as derivative inside an odesolve block.

Otherwise you get an "unknown variable" error.

But of course you can use that symbol to declare a new function whist happens to be the derivative. But then you could use the shift-ctrl-K method to define variable names using other diacritic characters.

I remember (but can't find) a thread. where Richard (at least I think he was it) explained how to get those diacritic characters above a variable and not aside as in my example. But I also remember that I never was able to duplicate what he did, probably due to localized Windows version I use.

The left was created using ctrl-F7, the right typing y and Alt-249 (on the numeric keypad) - not sure if that works for any keyboard layout.

Highlighted
##

- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Notify Moderator

05-29-2013
09:41 AM

05-29-2013
09:41 AM

Re: Time derivatives

It is an especial numerical/symbolical operator in Prime. It works in and outside of the Solve block.

Highlighted
##

- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Notify Moderator

05-29-2013
10:51 AM

05-29-2013
10:51 AM

Re: Time derivatives

As people often say, that Prime is one step forward and three steps backward - this seems to be one of the foreward steps 😉

Maybe it should be added, that you can insert that operator multiple times to creater higher derivatives, too.

Highlighted
##

- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Notify Moderator

05-29-2013
01:02 PM

05-29-2013
01:02 PM

Re: Time derivatives

Werner Exinger wrote:

As people often say, that Prime is one step forward and three steps backward

Sorry, but the ideom is "One step backward and two steps forward"

Highlighted
##

- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Notify Moderator

05-29-2013
01:12 PM

05-29-2013
01:12 PM

Re: Time derivatives

Valery Ochkov wrote:

Werner Exinger wrote:

As people often say, that Prime is one step forward and three steps backward

Sorry, but the ideom is "One step backward and two steps forward"

Unfortunately not in case of Prime 😞 sorry, too!

Highlighted
##

- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Notify Moderator

05-29-2013
02:40 PM

05-29-2013
02:40 PM

Re: Time derivatives

Valery Ochkov wrote:

It is an especial numerical/symbolical operator...

May be you will get the numerical answer