On 3/16/23 12:48 AM, Mr. Brian B.
McGuinness wrote:
These are a few things I noticed while glancing over the
document:
In section 3.1.2, the sequence \a is shown as evaluating to both
NUL and BEL. Checking with quad AV, it appears that \0 will
produce NUL and \a will produce BEL.
In the table in section 3.4.9, the definition of equal has three
circles, which looks wrong.
In section 3.4.12, note that star-dieresis is the power
operator, not the rank operator. For an integer right operand
it repeats the operation the specified number of times. (if the
integer is negative, it applies the inverse operation the number
of times given by the absolute value of the integer). So
1 (○⍣3) X or 1 ({circle}{star-dieresis} 3) X is the
sine of the sine of the sine of X, 1 (○⍣¯3) or 1
({circle}{star-dieresis} {negative}3) X is the arcsine of the
arcsine of the arcsine of X, and so on.
Otherwise, I think that the quick tour is very nice. It has
plenty of good examples to illustrate how things work. I also
like the tables of functions and operators. It can serve as a
nice introduction to APL for beginners.
--- Brian McGuinness