CIGAL Reference Manual, Chapter 2 (Commands): fill
usage: fill vdst vsrc wrap_flag
FILL copies VSRC to VDST as many times as necessary to fill VDST. If the target variable VDST is a MATRIX, IMAGE, or SOLID, the WRAP_FLAG argument specifies whether to start a each new line of VDST with a new copy of VSRC.
WRAP_FLAG != 0, VSRC is copied in its entirety to VDST, wrapping from one line to the next if necessary. WRAP_FLAG == 0, each new line of VDST begins with a new copy of VSRC regardless of the size of VSRC. (Default: WRAP_FLAG = 0).
See Also:
VARIABLES(1)