Charles, There are several ways to do what you wish within geomorph. First, the plotTangentSpace function does allow one to specify which axes are plotted. This can be useful for obtaining shape deformations along the extremes of axes other than PC1 and PC2.
A more flexible option is to use the function shape.predictor. Here, one provides scores, say for a given PC or a regression, and can obtain predicted shapes based on them. The help file provides example usage for this, and many other applications (e.g., obtain shape deformations for mean shapes, predicted shapes, etc.). Finally, I will also mention that we are about to release a new version of geomorph which will include capabilities to select locations in statistical plots, which will allow shape visualization of those locations in real time. I will post more on this in the near future. Hope this helps, Dean Dr. Dean C. Adams Director of Graduate Education, EEB Program Professor Department of Ecology, Evolution, and Organismal Biology Iowa State University https://www.eeob.iastate.edu/faculty/adams/ phone: 515-294-3834 -----Original Message----- From: Charles Zhang <charlesc...@gmail.com> Sent: Monday, March 25, 2019 4:38 PM To: MORPHMET <morphmet@morphometrics.org> Subject: [MORPHMET] Visualizing shape differences in PCA Dear all, I'm using the Geomorph package in R to do the PCA. It shows the negative-most and positive-most shapes of a PC, which is really great. I just want to ask if there is any way to visualize shape change along a certain PC? I know that Morphologika does this by allowing one to move the cursor along a PC to visualize shape change. However, when I import my data to process in the Morphologika, it always reports error. Perhaps it is because I use too many semilandmarks but too few specimens. Could you please tell me if there is an alternative way to visualize shape differences along a PC, rather than just at the two-end points? Thank you very much for taking your time to look at my question! Best regards, Charles -- MORPHMET may be accessed via its webpage at http://www.morphometrics.org --- You received this message because you are subscribed to the Google Groups "MORPHMET" group. To unsubscribe from this group and stop receiving emails from it, send an email to morphmet+unsubscr...@morphometrics.org. -- MORPHMET may be accessed via its webpage at http://www.morphometrics.org --- You received this message because you are subscribed to the Google Groups "MORPHMET" group. To unsubscribe from this group and stop receiving emails from it, send an email to morphmet+unsubscr...@morphometrics.org.
