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matlab: add far-field plot helper functions

pull/5/head
Stefan Mahr 2013-06-04 15:50:15 +02:00
parent 0e11975235
commit 31ebb3f994
2 changed files with 142 additions and 0 deletions
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68
matlab/plotFF3D.m Normal file
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function h = plotFF3D(nf2ff,varargin)
% h = plotFF3D(nf2ff,varargin)
%
% plot normalized 3D far field pattern
%
% input:
% nf2ff: output of CalcNF2FF
%
% variable input:
% 'cellelement': - use element from cell array
% - default is 1
% 'logscale': - if set, show farfield with logarithmic scale
% - set the dB value for point of origin
% - values below will be clamped
%
% example:
% plotFF3D(nf2ff, 'cellelement', 2, 'logscale', -20)
%
% see examples/NF2FF/infDipol.m
%
% See also CalcNF2FF
%
% openEMS matlab interface
% -----------------------
% author: Thorsten Liebig, Stefan Mahr
% defaults
logscale = [];
cellelement = 1;
for n=1:2:numel(varargin)
if (strcmp(varargin{n},'logscale')==1);
logscale = varargin{n+1};
elseif (strcmp(varargin{n},'cellelement')==1);
cellelement = varargin{n+1};
end
end
E_far_normalized = nf2ff.E_norm{cellelement} / max(nf2ff.E_norm{cellelement}(:));
if ~isempty(logscale)
E_far_normalized = 20*log10(E_far_normalized)/-logscale + 1;
ind = find ( E_far_normalized < 0 );
E_far_normalized(ind) = 0;
titletext = sprintf('electrical far field [dB] @ f = %e Hz',nf2ff.freq(cellelement));
else
titletext = sprintf('electrical far field [V/m] @ f = %e Hz',nf2ff.freq(cellelement));
end
[theta,phi] = ndgrid(nf2ff.theta,nf2ff.phi);
x = E_far_normalized .* sin(theta) .* cos(phi);
y = E_far_normalized .* sin(theta) .* sin(phi);
z = E_far_normalized .* cos(theta);
%figure
h = surf( x,y,z, E_far_normalized );
set(h,'EdgeColor','none');
axis equal
title( titletext );
xlabel( 'x' );
ylabel( 'y' );
zlabel( 'z' );
if (nargout == 0)
clear h;
end
end

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matlab/plotFFdB.m Normal file
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function h = plotFFdB(nf2ff,varargin)
% h = plotFFdB(nf2ff,varargin)
%
% plot far field pattern in dBi
%
% input:
% nf2ff: output of CalcNF2FF
%
% variable input:
% 'cellelement': - use element from cell array
% - default is 1
% 'xaxis': - 'phi' (default) or 'theta'
% 'param': - array positions of parametric plot
% - if xaxis='phi', theta is parameter, and vice versa
% - default is 1
%
% example:
% plotFFdB(nf2ff, 'cellelement', 2, ...
% 'xaxis', 'phi', 'param', [1 46 91])
%
% see examples/NF2FF/infDipol.m
%
% See also CalcNF2FF
%
% openEMS matlab interface
% -----------------------
% author: Thorsten Liebig, Stefan Mahr
% defaults
cellelement = 1;
xaxis = 'phi';
param = 1;
for n=1:2:numel(varargin)
if (strcmp(varargin{n},'cellelement')==1);
cellelement = varargin{n+1};
elseif (strcmp(varargin{n},'xaxis')==1);
xaxis = varargin{n+1};
elseif (strcmp(varargin{n},'param')==1);
param = varargin{n+1};
end
end
D_log = nf2ff.E_norm{cellelement} / max(nf2ff.E_norm{cellelement}(:));
D_log = 20*log10(D_log) + 10*log10(nf2ff.Dmax);
if (strcmp(xaxis,'theta')==1);
xax = nf2ff.theta;
yax = D_log(:,param);
parval = nf2ff.phi(param);
param = 'phi';
elseif (strcmp(xaxis,'phi')==1);
xax = nf2ff.phi;
yax = D_log(param,:);
parval = nf2ff.theta(param);
param = 'theta';
end
%figure
h = plot( xax / pi * 180 , yax );
xlabel( sprintf('%s (deg)',xaxis ));
ylabel( 'directivity (dBi)');
createlegend = @(d)sprintf("%s = %3.1f",param,d / pi * 180);
legendtext = arrayfun(createlegend,parval,'UniformOutput',0);
legend( legendtext );
title( sprintf('far field pattern @ f = %e Hz',nf2ff.freq(cellelement)) );
grid on;
if (nargout == 0)
clear h;
end
end