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To break the execution. ) When the program has stopped, type 9$56 )16 6, The State Indicator shows the calling structure and the line on which execution halted. • Use your editor to open the function at the top of the stack, and find the line on which execution is suspended. • A line is restartable if it can be run again and again without changing the outcome. Look carefully at the suspended line to determine if the line is restartable. If so, type gn/& otherwise try to restart from an earlier (gn/&) or later (gn/&) line or load another workspace.

The essential difference between these two schemes is that in the grounded system, enclosing () a simple scalar produces an enclosed scalar, whereas in the floating system, enclosing (}) a simple scalar leaves it unchanged. We here follow the current mainstream floating array model of IBM’s APL2 . • Given the simple array $f Ÿž enclose it. }$          Note that the display form is indented one character. Check the rank is that of a scalar. • Now assign this scalar to the second row and second column position of A.

Quote-quad is an I/O variable like quad (n) but for characters. It is written o. Likewise there was an APL company called Inner Product and another called Dyadic Systems. Dyadic Systems had an Outer Products catalogue of end user solutions. Puns or what?! It is of interest to note that the name Dyalog originates from a joint project between Dyadic and Zilog whose outcome was the first version of the Dyalog APL interpreter in 1982. :-) A second operator with irregular syntax is the axis operator that surrounds its numeric “right” operand with brackets.

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A practical introduction to APL-1 & APL-2 by Graeme Donald Robertson

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