| 1 | #!/usr/bin/env python |
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| 2 | # |
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| 3 | # Author: Patrick Hung (patrickh @caltech) |
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| 4 | # Copyright (c) 1997-2016 California Institute of Technology. |
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| 5 | # License: 3-clause BSD. The full license text is available at: |
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| 6 | # - http://mmckerns.github.io/project/mystic/browser/mystic/LICENSE |
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| 7 | """ |
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| 8 | See test_zimmermann.py. |
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| 9 | |
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| 10 | This one uses Scipy's CG (Polak-Ribiere) plus matlab viz. |
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| 11 | """ |
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| 12 | |
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| 13 | import sam |
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| 14 | from test_zimmermann import * |
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| 15 | from scipy.optimize import fmin_cg |
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| 16 | import numpy |
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| 17 | from mystic.tools import getch |
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| 18 | |
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| 19 | def draw_contour(): |
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| 20 | import numpy |
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| 21 | |
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| 22 | x, y = numpy.mgrid[-.51:7.5:0.05,-.51:7.5:0.05] |
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| 23 | c = 0*x |
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| 24 | s,t = x.shape |
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| 25 | for i in range(s): |
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| 26 | for j in range(t): |
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| 27 | xx,yy = x[i,j], y[i,j] |
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| 28 | c[i,j] = CostFunction([xx,yy]) |
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| 29 | |
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| 30 | |
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| 31 | sam.putarray('X',x) |
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| 32 | sam.putarray('Y',y) |
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| 33 | sam.putarray('C',c) |
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| 34 | |
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| 35 | sam.verbose() |
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| 36 | sam.eval("[c,h]=contourf(X,Y,log(C*20+1)+2,100);set(h,'EdgeColor','none')") |
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| 37 | sam.eval("title('Zimmermann''s Corner. Min at 7,2')") |
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| 38 | sam.eval('hold on') |
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| 39 | |
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| 40 | |
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| 41 | def run_once(x0,x1): |
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| 42 | sol = fmin_cg(CostFunction, [x0, x1], retall = True, full_output=1) |
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| 43 | xy = numpy.asarray(sol[-1]) |
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| 44 | sam.putarray('xy',xy) |
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| 45 | sam.eval("plot(xy(:,1),xy(:,2),'w-','LineWidth',2)") |
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| 46 | sam.eval("plot(xy(:,1),xy(:,2),'wo','MarkerSize',6)") |
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| 47 | return sol |
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| 48 | |
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| 49 | if __name__ == '__main__': |
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| 50 | draw_contour() |
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| 51 | run_once(1,3) |
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| 52 | run_once(4,2) |
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| 53 | run_once(7,0.1) |
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| 54 | run_once(6,4) |
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| 55 | run_once(0,7) |
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| 56 | |
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| 57 | getch("Press any key to quit") |
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| 58 | |
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| 59 | # end of file |
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