Re: [Meep-discuss] time-averaged magnetic field amplitude
Neat, thanks! For the time average amplitude of a complex field, I changed the convert-h5 function as shown below. It's very hokey because the field component is hard-coded into the function, but it works. Also, it's not really an average but rather a sum, which is okay if you just want a pretty picture. (define (convert-complex-h5 rm? convert-cmd . step-funcs) (define (convert fname) (if (and rm? (zero? (system (string-append convert-cmd \ fname :hz.i\ \ fname :hz.r\ (system (string-append rm \ fname \ (lambda (to-do) (let ((hooksave output-h5-hook)) (set! output-h5-hook convert) (map (lambda (f) (eval-step-func f to-do)) step-funcs) (set! output-h5-hook hooksave (define (complex-time-avg fname step-func) (let ((first-step? true)) (lambda (to-do) (if first-step? (begin ; just copy the output file to fname (set! first-step? false) ((convert-complex-h5 true (string-append h5math -e \sqrt(d1*d1 + d2*d2)\ fname ) step-func) to-do)) ;; otherwise, add the output file to fname ((convert-complex-h5 true (string-append h5math -e \d1 + sqrt(d2*d2 + d3*d3)\ fname fname ) step-func) to-do) On Tue, 17 Jun 2008, Steven G. Johnson wrote: On Jun 17, 2008, at 5:37 AM, matt wrote: I want meep to output the amplitude of the complex time-average magnetic field over the computation domain, as an h5 file. See e.g. http://thread.gmane.org/gmane.comp.science.electromagnetism.meep.general/1456 but I'm not looking for for the instantaneous magnetic field. I'm also not interested in the time-average flux or energy, which I could with flux-in-box or field-energy-in-box. Those two only give you time averages if you have time-harmonic complex fields (i.e. a CW source, with force-complex-fields?=true, and have waited for transients to disappear). But in the case of a time-harmonic source, the time-average field is simply zero. Steven ___ meep-discuss mailing list meep-discuss@ab-initio.mit.edu http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss ___ meep-discuss mailing list meep-discuss@ab-initio.mit.edu http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
[Meep-discuss] Question on h5tovtk
Dear Steven and meep community,
I created a hdf5-file with all E-field components using
...
(to-appended e (at-every 0.5 output-efield))
...
this seems to work, since h5ls gives:
h5ls test-e.h5
ex Dataset {50, 50, 50, 200/Inf}
ey Dataset {50, 50, 50, 200/Inf}
ez Dataset {50, 50, 50, 200/Inf}
Now I want to convert this hdf5-file into the vtk format, a vector vtk
file for mayavi (to get a vector plot with arrows), using
h5tovtk -t 150 -o test.vtk test-e.h5
But the produced vtk-file just contains the Ex component:
In Mayavi I can only choose to visualize ex, also the header of
test.vtk is:
# vtk DataFile Version 2.0
Generated by h5tovtk.
BINARY
DATASET STRUCTURED_POINTS
DIMENSIONS 50 50 50
ORIGIN 0 0 0
SPACING 1 1 1
POINT_DATA 125000
SCALARS ex float 1--- shouldn't this be different if it was a
vector vtk?
LOOKUP_TABLE default
What am I doing wrong?
Thank you very much for your help in advance!
Regards
Alex
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[Meep-discuss] meep symmetry and looping
Dear Steven and meep users, I have two questions. 1. Regarding symmetry: if I have a symmetric slab lying in the z=0 plane and place a Gaussian Hz source at (0, 0, 0), then I can exploit the following symmetries (set! symmetries (list (make mirror-sym (direction X) (phase -1)) (make mirror-sym (direction Y) (phase -1)) (make mirror-sym (direction Z)) )) Right? However, when I run meep once exploiting symmetries and once without I get slightly different results (the frequencies and Q values of the identified modes are different within 1% or so, and in addition, when I run the program with symmetries I identify a couple of extra modes of low Q values). Why is that? I'm thinking that this is a numerical artefact, however I just wanted to check if I have misunderstood the symmetry principles. 2. If I want to optimize the structure using different slab thickness and so on, I have to write a loop, which runs through the different parameters. I use (restart-fields) in order to reinitialize the fields, however is there an analogous function to reinitialize the epsilon geometry? Or would it be enough to overwrite whatever I have with air and then start anew? In addition, the output files at every loop iteration have the same names. For example, the structure file is always called eps-00.00.h5. Is there a way to have a different prefix for the output files for different loop iterations in order for the data not to get overwritten every time? Thanks a lot in advance, George ___ meep-discuss mailing list meep-discuss@ab-initio.mit.edu http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
