Time derivatives

Forum|Forum|12 years ago
May 29, 2013
2 replies
4558 views

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?

Calculus_Derivatives

W

Werner_E

25-Diamond I

James McNabb wrote:
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?

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

http://communities.ptc.com/message/43259#43259

http://communities.ptc.com/message/154826#154826

F

Fred_Kohlhepp

23-Emerald I

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 . . .

W

Werner_E

25-Diamond I

Fred Kohlhepp wrote:
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 . . .

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.