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 Do ".  1 _ _ Numbers

 ".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. 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

For example:
```   ". s=: '5 * a=: 3 + i. 6'
15 20 25 30 35 40

a
3 4 5 6 7 8

do=: ".
do t=: '3 % 5'
0.6
do |. t
1.66667
\$ do ''
0

]program=: 'a=: 2^3' ,: '5*a'
a=: 2^3
5*a

do program
8 40

do 'sum=: +/'

sum 1 2 3 4
10

s ; _999". s=: '1 2 3','-4 .5',:'bad 3,141'
+---------+--------------+
|1 2 3    |   1    2    3|
|-4 .5    |  _4  0.5 _999|