# Contour plot

>     x=-2:.1:2;
>     y=-2:.1:2;
>     [X,Y]=meshgrid(x,y);
>     matrix=X.*exp(-X.^2-Y.^2);

>     eopen('demo5a.eps',0,180,140);
>     eglobpar;
>     ePlotTitleText='Contour Plot';
>     ePlotTitleDistance=15;
>     ePlotAreaPos=[20 20];
>     eXAxisSouthLabelText='x - Axis';
>     eYAxisWestLabelText='y - Axis';
>     eImageLegendLabelText='z - Color Legend';
>     eContourValueVisible=1;
>     eaxes([-2 0 2],[-2 0 2]);
>     eimagesc(matrix,ecolors(3),'e');
>     etext('        (1. value)',eImageLegendValuePos(1,1),...
>       eImageLegendValuePos(1,2),4,4,2);
>     econtour(matrix,[-0.5 0.05 0.5],0,[1 1 1;0 0 0;0 0 0]);
>     eclose(1,0);

>     % quiver plot
>     eopen('demo5b.eps',0,180,140);
>     eglobpar;
>     ePlotTitleText='Quiver Plot';
>     ePlotTitleDistance=15;
>     ePlotAreaPos=[20 20];
>     eXAxisSouthLabelText='x - Axis';
>     eYAxisWestLabelText='y - Axis';
>     eImageLegendLabelText='z - Color Legend';
>     eaxes([-2 0 2],[-2 0 2]);
>     eimagesc(matrix,ecolors(3),'e');

>     % sw
>     x=-2.1:.2:-0.1;
>     y=-2.1:.2:-0.1;
>     [X,Y]=meshgrid(x,y);
>     qmatrix=X.*exp(-X.^2-Y.^2);
>     [dx dy]=egradient(qmatrix,.2,.2);
>     equiver(X,Y,dx,dy,[1 1 1]);

>     % nw
>     x=-2.1:.2:-0.1;
>     y=0.1:.2:2.1;
>     [X,Y]=meshgrid(x,y);
>     qmatrix=X.*exp(-X.^2-Y.^2);
>     [dx dy]=egradient(qmatrix,.2,.2);
>     edsymbol('spire','spire.psd');
>     equiver(X,Y,dx,dy,[1 1 1],'spire');

>     % ne
>     x=0.1:.2:2.1;
>     y=0.1:.2:2.1;
>     [X,Y]=meshgrid(x,y);
>     qmatrix=X.*exp(-X.^2-Y.^2);
>     [dx dy]=egradient(qmatrix,.2,.2);
>     edsymbol('needle','needle.psd');
>     equiver(X,Y,dx,dy,[0 0 0],'needle');

>     % se
>     x=0.1:.2:2.1;
>     y=-2.1:.2:-0.1;
>     [X,Y]=meshgrid(x,y);
>     qmatrix=X.*exp(-X.^2-Y.^2);
>     [dx dy]=egradient(qmatrix,.2,.2);
>     edsymbol('ftria','ftria.psd',1,0.4);
>     equiver(X,Y,dx,dy,[0 0 0],'ftria');

>     eclose(1,0);

>     % quiver and contour
>     eopen('demo5.eps')
>     esubeps(2,1,1,1,'demo5a.eps');
>     delete('demo5a.eps')
>     esubeps(2,1,2,1,'demo5b.eps');
>     delete('demo5b.eps')
>     eclose
>     if ~exist('noDemoShow')
>       eview                                   % start ghostview with eps-file
>     end

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