Thanks, Henry!
OK, given that
maxrows=. 50
maxcolumns=. 50
chart=. (maxrows,maxcolumns) $ a:
now works and appending this (to put an 'X' in one of the boxes):
r=. 37
c=. 0
why does neither
chart=. 'X' (r,c) } chart
nor
chart=. 'X' (<r,c) } chart
work? The explicitly numeric versions
chart=. 'X' (37 0) } chart
and
chart=. 'X' (<37 0) } chart
don't work either (domain error in all 4 cases for the row/column index
value). Thanks in advance for any further insights!
Harvey
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