On Thu, Aug 13, 2009 at 04:40:23PM +0800, [email protected] wrote:
> I have some AFM images of quantum dots. Now I want to change their height
> axes (Z axes) to be -abs(sqrt(dz/dx^2 + dz/dy^2)), where z(x,y) is the
> topograph and dz/dx, dz/dy are numerical derivatives along the two image
> axes.
At this moment, there is no function that calculates this. If you want
to just see a visualization, try Presentation -> Edge -> Inclination.
However, getting this quantity for further processing is not possible[*]
It is more or less trivial to add -- I'm not sure where such function
should appear in the menus though.
The other possibility, which I will probably implement in any case, is
to add variables dx1, dy1, dx2, ... to Arithmetic, representing the x-
and y-derivatives of the corresponding data fields. Then you will be
able to easily calculate the result using
-hypot(dx1,dy1)
(and then fix the units because Arithmetic is not smart enough to
figure out the units of the result from the formula).
Regards,
Yeti
[*] Technically, it is possible but it requires to use the Convolution
filter twice to get the derivatives, Arithmetic for the formula and then
Calibrate to correct the units and scale of the result.
------------------------------------------------------------------------------
Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
trial. Simplify your report design, integration and deployment - and focus on
what you do best, core application coding. Discover what's new with
Crystal Reports now. http://p.sf.net/sfu/bobj-july
_______________________________________________
Gwyddion-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/gwyddion-users
