No arrows in quiver plot

Question

Elle 2013-5-13

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/75562-no-arrows-in-quiver-plot

For some reason there are no arrows in my quiver plot just some weird marks. What am I doing wrong?

if true
clc; clear;

alpha = 0.6; beta = 0.4; rho = 2; gamma = 0.6; phi = 0.7; x = 400; s = 0.2;

l = 100; a = 0.3;

[l,a] = meshgrid(-10:1:10);

lend = NaN(size(l)); aend = NaN(size(l));

%calculate next point from each point

for i=1:length(l)

   for j=1:length(a)
      lEnd(i,j) = (gamma/rho)*l(i)^(alpha)*a(j)^(1-alpha)*x^(1-alpha);
      aEnd(i,j) = s*l(i)^(beta+1)*a(j)^(phi)*x^(-beta) ;
   end
end

%plot, arrow directions are changes

quiver(l,a,lEnd-l,aEnd-a,s)

end

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Answer 1

David Sanchez 2013-5-13

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/75562-no-arrows-in-quiver-plot#answer_85217

set s=2 (for example), you are scaling the arrows to a very small size.

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Elle 2013-5-13

在 MATLAB Online 中打开

I changed it but it still doesn't do much. Also realized I was using s as one of the parameters and changed it to sp.

   if true
    clc; clear;

alpha = 0.6; beta = 0.4; rho = 2; gamma = 0.6; phi = 0.7; x = 400; sp = 0.2;

l = 100; a = 0.3;

%Control of meshgrid [l,a] = meshgrid(-10:2:10);

lend = NaN(size(l)); aend = NaN(size(l));

%calculate next point from each point

for i=1:length(l)

   for j=1:length(a)
      lEnd(i,j) = (gamma/rho)*l(i)^(alpha)*a(j)^(1-alpha)*x^(1-alpha);
      aEnd(i,j) = sp*l(i)^(beta+1)*a(j)^(phi)*x^(-beta) ;
   end
end

%plot, arrow directions are changes

quiver(l,a,lEnd-l,aEnd-a,2)

end

Youssef Khmou 2013-5-13