Inverted signs using eig function... again

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Hi everyone. I know this is a very popular question and I've read a few questions about it but I can't understand much mathematical/matlab jargon so I'm trying to ask again.

Basically I have two 3x3 matrices, K and M. And I'm using the following:

[V,G]=eig(K,M)

...to find the eigenvectors and plot them with one varying variable used in K. And I got this graph attached below.

Obviously you can see a part of the graph has been put a negative sign. Thus I have no idea on how to invert it back.

I've found the 'eigenshuffle' function provided in one of the threads here(<http://www.mathworks.com/matlabcentral/fileexchange/22885-eigenshuffle>) but I can't get generalized eigenvectors(?). As in I cannot have two input matrices K and M as I have before.