Re: [femm] creating a line for x-y plot of |B|

[dcm3c@xxxxxxx]

In a message dated 8/2/00 9:31:54 AM Eastern Daylight Time, 
jon.crawley@xxxxxxxxxxxxxx writes:

> David, thank you for advice and example on how to creat a permamnent 
> magnet material in the database. I now seem to have got the hang of 
> FEMM and like it very much.
> 
> however there are a few niggly points which I would like to comment 
> on, maybe I am doing something wrong.
> 
> 1. The models I have been using are imported DXFs, this seems to be 
> OK. However if I wish to add some points to the model in the FEMM 
> editor in precise positions I am having trouble. firstly I create a 
> point roughly where I want it to go, then I select it and press <TAB> 
> which shows me the co-ordinates. I then change these to the cor-
> ordinates I need (accurate to 0.01 of a mm), and a new point is 
> created (why?). If I then select this and press <TAB> to view the co-
> ordinates of the new point they appear to be different to what I have 
> just entered ?

To enter in a point, just press <TAB> and enter the coordinates of the point 
that you want. The numbers that appear in the <TAB> dialog don't have 
anything to do with the nearest point--they are just the location of the 
mouse pointer from the instant at which you pressed the tab key. To get the 
coordinates of the nearest point in the geometry, double-click on the right 
mouse button. A message box will pop up with the location of the nearest 
point.

> 2. When viewing the XY plot in the post processor it would be nice to 
> have a cursor option in order to inspect absolute value along the 
> line.

Something like this implemented in the 3.0 Beta version.

> 3. Also it would be nice to be able to plot two XY plots on the same 
> curve from 2 seperately defined line positions (so you can compare 
> how the flux density varies through a gap)

I'm not really planning on making the plotting capabilities comprehensive 
enough to cover every possible display situation. Probably the best recourse 
is to make plots with multiple traces by saving the data to disk by checking 
the "Write data to text file" check box in the dialog where you choose what 
quantity is to be plotted. You can then import it into mathematica, matlab, 
gnuplot, etc. to plot things in a more arbitrary way.

Dave.
--
http://members.aol.com/dcm3c