Why doesn't quiver work for this function?

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)

Answer 1

[Star Strider]

‘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

Answer 2

[SRI]

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)

[Ryan]

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]

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