1. A system for mapping electrical activity of a heart, comprising: a catheter comprising a distal end including a multiple electrode structure, the multiple electrode structure comprising a plurality of electrodes; a processor electrically coupled to the plurality of electrodes, wherein the processor is configured to: collect a set of signals from more than one of the plurality of electrodes, wherein more than one electrode of the plurality of electrodes collects the set of signals over a time period and includes signals from more than one heart cycle; calculate at least one propagation vector from the set of signals, wherein the propagation vector includes a direction and magnitude and wherein the magnitude is correlated to a characteristic of propagation of the electrical activity of the heart; generate a data set from the at least one propagation vector; generate a statistical distribution of the data set, wherein the statistical distribution includes the signals collected by the more than one electrode from the more than one heart cycle; and output to a display device a visual representation of the statistical distribution and the at least one propagation vector including the magnitude of the at least one propagation vector.