Memory Use

Most of the programs in PC-ORD can accept a matrix up to 32,000 rows or 32,000 columns, provided that you have adequate memory installed in your machine.

For all analyses, the following limits apply:

rows x columns < 536,848,900
rows < 32,000 (23,170 if a square distance matrix is calculated)
columns < 32,000 (23,170 for PCA)

The actual limits will depend on the particular analysis being used. For example all analyses that require a square distance matrix (Cluster Analysis, MRPP, NMS, PerMANOVA, etc.), the maximum number of rows is 23170.