Related programs

• pca computes the principal components of a set of spectra. This can be useful in variability analysis. It is separate from molly because of the large amount of storage it requires. It works by regarding a set of spectra as points in a large dimensional space. It then works out a set of directions, the first of which captures most of the variability, the next is orthogonal and captures some more etc. These are eigenvectors (and the eigenvalues measure the amount of variability) of a huge matrix.
• molcon converts between molly files written under SunOS/Solaris and Ultrix/OSF/Linux. The same translation can be done inside molly with lfor but molcon can be done as a one line command and is able to translate the files in place which avoids needing lots of space available and having to think up new names. In this mode it also fairly fast.