I should add how it works: On the right, 10^(The position of '.' in the number minus 1) On the left, remove '.' and parse as number In the middle, apply x: to both sides and divide.
Also, how can I go about actually debugging domain errors? Both sides seem to be zero-dimensional. On Wed, 6 Jan 2021 at 10:20, Justin Paston-Cooper <paston.coo...@gmail.com> wrote: > > Thanks for the suggestion. I've combined Don's idea of using x: and > your idea of removing the point and parsing that to handle all numbers > of digits after the decimal point: > > stringToRational =: ((_&".)@(-.&'.') %&:x: 10&^@(<:@# - (i.&'.')) > > stringToRational '666.66' should give 333r50. > > Sadly this is giving a domain error, even though both sides of the > fork work alone. Could anyone suggest how to fix this? > > On Tue, 5 Jan 2021 at 19:14, Jimmy Gauvin <jimmy.gau...@gmail.com> wrote: > > > > IF your strings always have two numbers after the decimal point you could > > remove the point before converting to numeric. > > > > NB.Remove decimal point > > '.' -.~ each '123.45' ; '1456.12' > > ┌─────┬──────┐ > > │12345│145612│ > > └─────┴──────┘ > > > > NB. Convert to numeric > > _ ". > '.' -.~ each '123.45' ; '456.12' > > 12345 45612 > > > > NB. type 4 is integer > > 3!:0 ] _ ". > '.' -.~ each '123.45' ; '456.12' > > 4 > > > > On Tue, Jan 5, 2021 at 10:43 AM Justin Paston-Cooper < > > paston.coo...@gmail.com> wrote: > > > > > Hello, > > > > > > I am reading in tab-separated files with readdsv from 'tables/dsv'. > > > Some columns consist of exact decimal numbers like 6.66. These generally > > > involve amounts of a decimal currency. These are read in by readdsv as > > > boxed strings. makenum from 'tables/csv' converts these strings to > > > floats. I would like these strings to be converted exactly to > > > rationals. How can I go about this in the easiest and most efficient > > > way? I could not find information on parsing data types from strings. > > > > > > Thanks in advance, > > > > > > Justin > > > ---------------------------------------------------------------------- > > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
