Got it:

FOR yy = 1 TO max_room
	FOR xx = 1 TO n_lines
		WAIT WINDOW "Next slot: " + 'Line ' + ALLTRIM(STR(xx)) + ' - ' + 'Room ' + ALLTRIM(STR(yy)) + ' : ' + ALLTRIM(STR(x_room( xx, yy )))
	ENDFOR
ENDFOR

>The x_room array displays like the following with each line grouped together by the four columns:
>
>

>(Line,Room)
>
>(1,1)
>(1,2)
>(1,3)
>(1,4)
>(2,1)
>.
>.
>.
>(25,4)
>

>
>I want to move through it like this so all the rooms are in order of groups of 25:
>
>

>(Line,Room)
>
>(1,1)
>(2,1)
>(3,1)
>(4,1)
>(5,1)
>.
>.
>.
>(25,1)
>(1,2)
>(2,2)
>(3,2)
>(4,2)
>(5,2)
>.
>.
>.
>(25,2)
>.
>.
>.
>

>
>This is the basic code that goes through it currently:
>
>

>FOR yy = 1 TO max_room
>	FOR xx = 1 TO n_lines
>		WAIT WINDOW "Next slot: " + ALLTRIM(STR(x_room( xx, yy )))
>	ENDFOR
>ENDFOR
>