".y executes the sentence y .
If the execution results in a noun, the result of ".y
is that noun; if the execution result is a verb, adverb, or conjunction,
or if there is no execution result,
the result of ".y is an empty vector.
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x".y converts character array y into numbers.
The shape of the result is (}:$y),(1=n)}.n where n is
the maximum number of numbers in any row. x is a scalar number
used to replace illegal numbers and to pad narrow rows.
In the conversion, the normal rules for numeric constants are
relaxed as follows:
- the negative sign can be - or _
- commas within numbers are ignored
- fractions need not have a digit 0 before the decimal point
- a number may be preceded by a + sign;
the exponent of a number in exponential format
may be preceded by a + sign
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