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    <p>I believe your attribute names are being truncated because of an option in the PCA filter.</p> <pre> -A Maximum number of attributes to include in transformed attribute names. (-1 = include all, default: 5) </pre> <p>Using the following code I change the value of this option to -1 and print an attribute name from the transformed data. </p> <pre><code> Instances originalTrain=...//load the training data PrincipalComponents pca = new PrincipalComponents(); // new PCA filter pca.setMaximumAttributeNames(-1); //set the value to -1 pca.setInputFormat(originalTrain);// inform filter about dataset Instances newData = Filter.useFilter(originalTrain, pca); // apply filter System.out.println(newData.attribute(0).name()); //look at new name </code></pre> <p>An example of the obviously untruncated attribute name is (scroll to view): </p> <pre>0.257stalksurfacebelowring=k+0.256stalksurfaceabovering=k+0.234ringtype=l+0.231odor=f-0.215ringtype=p-0.212stalksurfaceabovering=s+0.206sporeprintcolor=h-0.195stalksurfacebelowring=s+0.185bruises+0.18 stalkroot=b-0.176stalkcolorbelowring=w-0.175stalkcolorabovering=w-0.173odor=n-0.139sporeprintcolor=n-0.134sporeprintcolor=k+0.133habitat=p+0.133gillcolor=b+0.13 stalkcolorbelowring=b+0.13 stalkcolorabovering=b+0.129population=v+0.128stalkcolorabovering=n-0.125population=s-0.124stalkroot=e+0.121stalkcolorbelowring=n-0.119capcolor=w+0.119stalkcolorbelowring=p+0.119stalkcolorabovering=p-0.11gillspacing-0.105stalkroot=c-0.101gillcolor=n+0.094sporeprintcolor=w-0.087capshape=b-0.085gillcolor=k-0.082odor=l-0.082odor=a-0.082habitat=m+0.08 capcolor=y-0.08gillcolor=w+0.078gillcolor=h-0.076population=n-0.073habitat=g-0.072gillsize+0.068odor=y+0.068odor=s-0.067population=a-0.065capsurface=s-0.064odor=p+0.063gillcolor=g-0.059stalksurfaceabovering=f+0.057capsurface=y-0.057ringnumber=t-0.057stalksurfacebelowring=f+0.055ringnumber=o+0.051population=y-0.05habitat=u-0.048stalkcolorabovering=o-0.048stalkcolorbelowring=o+0.047veilcolor=w-0.046population=c+0.046capshape=k+0.046ringtype=e-0.046gillattachment-0.045stalkcolorabovering=g-0.045stalkcolorbelowring=g+0.043capcolor=e-0.041stalkroot=r-0.039gillcolor=u+0.039capcolor=g+0.034habitat=l-0.034veilcolor=n-0.034veilcolor=o-0.033habitat=w-0.031capcolor=p-0.031odor=c-0.031stalksurfacebelowring=y-0.031sporeprintcolor=r+0.03 capshape=f-0.029capcolor=n-0.028gillcolor=o-0.024stalkshape-0.024sporeprintcolor=o-0.024sporeprintcolor=y-0.024sporeprintcolor=b-0.024gillcolor=y-0.023gillcolor=e-0.023capcolor=b-0.023stalkcolorabovering=e-0.023stalkcolorbelowring=e-0.019gillcolor=r-0.018capshape=s-0.018sporeprintcolor=u-0.015capshape=x+0.012habitat=d+0.009gillcolor=p-0.006capsurface=g+0.005capsurface=f-0.004capshape=c+0.003stalkcolorbelowring=y-0.003stalkcolorabovering=y-0.003veilcolor=y+0.001stalksurfaceabovering=y+0.001capcolor=u+0.001capcolor=r-0.001capcolor=c+0 stalkcolorabovering=c+0 odor=m+0 ringtype=n+0 stalkcolorbelowring=c+0 ringnumber=n+0 ringtype=f </pre>
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