Documentation of quiverscale

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Function Synopsis

quiverscale(px,py,H)

Help text

QUIVERSCALE creates a scale at the bottom of the quiver plot, 
which plots the longest vector of the data set(px,py) and displays 
the vector's corresponding magnitude. The H input argument is the 
handle to the quiver plot axes.

Please note that the QUIVERSCALE function returns 
accurate results only when the vectors are plotted 
to actual scale (e.g.  QUIVER(U,V,S), where S=0).

Vincent Hodges 02/03/98

Listing of function quiverscale

function quiverscale(px,py,H)

h=get(H,'position');
h2=h;
h1=h(2)/4;
h(2)=h(2)+h1;
h(4)=h(4)-h1;
set(gca,'position',h);
hlim=get(gca,'xlim');
h2(end)=h2(end)/20;
h2(2)=h2(2)/3;
ax=axes('position',h2);
hlim(1)=0;
set(ax,'xlim',hlim);
xsq=px.^2;
ysq=py.^2;
arrowmag=max(unique(sqrt([xsq+ysq])));
size1=prod(size(arrowmag));
arrowmag2=reshape(arrowmag,size1,1);
X=zeros(size1,1);
Y=1:size1;
null=zeros(size1,1);
quiver(X,Y,arrowmag2,null,0);
set(ax,'xlim',hlim);
set(ax,'ytick',[]);