Why doesn't quiver work for this function?

2014 6 23
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更新时间：2014 6 23
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I have been trying everything and nothing is working. The only way I can get any kind of vector plot is if I delete the ratio at the end of the equation which I don't want to do. Please help.
[X Y]=meshgrid(0:.2:2,0:.2:2);
dY = .75*Y-.005*Y.^2-((1.5*Y.^3)/(1.25+Y.^3));
dX = ones(size(dY));
quiver(X,Y,dX,dY)

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Star Strider
Star Strider 2014-6-23

0 个投票

‘The only way I can get any kind of vector plot is if I delete the ratio at the end of the equation which I don't want to do.’
The only part of the equation you didn’t vectorise is the division. This statement works for me:
dY = .75*Y-.005*Y.^2-((1.5*Y.^3)./(1.25+Y.^3));
% ADD ^ ‘.’ HERE

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SRI
SRI 2014-6-23

0 个投票

Hi Ryan There is nothing problem in your coding because iam able to receive plot from your code
clc;
close all;
warning off
[X Y]=meshgrid(0:.2:2,0:.2:2);
dY = .75*Y-.005*Y.^2-((1.5*Y.^3)/(1.25+Y.^3));
dX = ones(size(dY));
quiver(X,Y,dX,dY)

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Ryan
Ryan 2014-6-23
I am still only getting dots everywhere. I am on a Mac using R2013a student edition. Are there any settings I need to change?
SRI
SRI 2014-6-23
Hi Ryan I am working in windows Os having the same edition, the code which you have displayed above will result the dotted matrix only, better you keep trying by placing the break points in your code
so that you can understand the meaning of the code

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