I was referencing it mostly for the visualization of the &quot;flower&quot; that fails with pca&#x2F;linear mapping.<p>The original Sammon&#x27;s paper is here [1], this said from what I know isomaps are a more widespread tool - but I never found such a good visualization.<p>[1] <a href="http:&#x2F;&#x2F;theoval.cmp.uea.ac.uk&#x2F;~gcc&#x2F;matlab&#x2F;sammon&#x2F;sammon.pdf" rel="nofollow">http:&#x2F;&#x2F;theoval.cmp.uea.ac.uk&#x2F;~gcc&#x2F;matlab&#x2F;sammon&#x2F;sammon.pdf</a>