[3] Helzer, Garry, Applied Linear Algebra with APL, Little, Brown, Boston, 1982. [4] H a r d y , G. H. and E. M. Wright, An , numeric scalars employ - for high minus, e for E, and j to s e p a r a t e real and complex components , B P L uses - for both A P L high minus and APL dyadic minus, and 0- for APL monadic minus ° n u m b e r s beginning w i t h 0 are i n t e r p r e t e d as alternate-base n u m e r a l s and may include the "digits" A - Z o labels are base-10 whole n u m b e r s followed by >> - distinct t o k e n s are used for monadic and dyadic s y s t e m f u n c t i o n s (such as B P L unit for APL signum and BPL * for A P L times, or B P L ~ for A P L shape and B P L @ for APL reshape)
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