8x8 LED matrix "smooth" horizontal scrolling text - what's the math?

[richard]

the easiest way is to store your data in an array where every byte represents a column and each bit a led
eg



then to scroll simply transfer the array data to the display with every successive pass beginning one column later than the previous
pausing sufficiently at each pass to get a smooth effect
eg
pass1 start array[0] array[1] ..... [14] array[15]
pass2 start array[1] array[2] ..... [15] array[0]
pass2 start array[2] array[3] ..... [0] array[1]