To store an array of integers, you will usually use the table object. To store an array of floating point values, you can use the buffer~ object. Although the buffer~ object is normally used for storing audio data, it can easily be used simply as an array of floats, accessed by the peek~ object, which works even when MSP audio is not on.
This patch demonstrates a way to create a video delay effect using jit.matrixset. The jit.matrixset object is essentially an array of Jitter matrices. One of the things you can do with such an array is store a set of past frames of a video to recall later. Here we use the array as a circular buffer of the most recent 30 video frames to come out of jit.qt.movie.
jit.matrixset has write and read messages that allow you to store and recall its contents in a file, just as you would do with most presets.
This patch shows a way to capture and play back excerpts of live video. It uses jit.matrixset as a circular buffer to hold selected frames of live video from jit.grab, and it uses the decide and random objects to make arbitrary decisions regarding when to record and which excerpt to play back.