function p11_tst_tmp


%% function tst1_v0

%[n,p]= meshgrid(0:.1:2, 0:.1:3);
[n,p]= meshgrid(0:.1:1.1, 0:.1:2.1);
n= n(:); p=p(:);

u= n.*(1-n-p);
v= p.*(.5-p/4 -3*n/4);

% clear vectors over p=2-2*n
if 1
    ind= find(p>2-2*n); u(ind)=0; v(ind)=0;
end

figure(301); clf; hold on
quiver(n,p,u,v)
axis equal

np0= [0 0; 0 2; 1 0; .5 .5];
plot(np0(:,1), np0(:,2), 'or')


%% function tst1

%[n,p]= meshgrid(0:.1:2, 0:.1:3);
%[n,p]= meshgrid(0:.1:1.1, 0:.1:2.1);
[n,p]= meshgrid(0.45:.01:.55, 0.45:.01:.55);
sz= size(n);

n= n(:); p=p(:);

u= n.*(1-n-p);
v= p.*(.5-p/4 -3*n/4);

figure(301); clf; hold on
g= 1e3;
quiver(n,p,g*u,g*v)

figure(302); clf; hold on
uv2= reshape(sqrt(u.*u+v.*v), sz);
%mask= (uv2>max(uv2(:,1))); uv2(mask)=max(uv2(:,1)); %0;
%imshow(uint8(inorm(uv2)))
%imagesc(uv2); axis xy
mesh(uv2)
view(24, 44)


%% function tst2

p11_sh_np(0,0)
p11_sh_np(0,2)
p11_sh_np(1,0)
p11_sh_np(.5,.5)