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f8c67929de
library/array2d.m:
Add lookup and unsafe_lookup, in both function and predicate forms,
as alternatives to rafe's ^elem notation.
Use meaningful variable names in both code and documentation.
For example, use NumRows and NumColumns instead of M and N.
Replace the implementation of the function that converts a 2d array
back to lists. The new implementation has one loop over rows and one
loop over columns, while the old one had a single loop that did
both jobs. The new one returns [] (meaning no rows) for a 0x0 array,
while the old returned [[]] (meaning one row with no columns).
NEWS:
Announce the changes.
tests/hard_coded/test_array2d.m:
Use a lookup instead of ^elem.
tests/hard_coded/test_array2d.exp:
Expect the updated output from lists. Expect any exceptions to come
from lookup functions, not ^elem functions (since the latter now
just call the former).
45 lines
1.2 KiB
Plaintext
45 lines
1.2 KiB
Plaintext
Empty =
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[]
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One =
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[[1]]
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One ^ elem(0, 0) = 1
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Two =
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[[1, 0]
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[0, 2]]
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Two ^ elem(0, 0) = 1
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Two ^ elem(0, 1) = 0
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Two ^ elem(1, 0) = 0
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Two ^ elem(1, 1) = 2
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Empty is empty
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One is not empty
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Two is not empty
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Two_a =
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[[1, 3]
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[0, 2]]
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Two_b =
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[[1, 3]
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[4, 2]]
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Zeroes =
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[[0, 0, 0]
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[0, 0, 0]
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[0, 0, 0]]
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Empty ^ elem(0, 0) = exception(univ_cons(software_error("function `array2d.lookup\'/3: indices out of bounds")))
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Zeroes ^ elem(-1, 0) = exception(univ_cons(software_error("function `array2d.lookup\'/3: indices out of bounds")))
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Zeroes ^ elem(0, -1) = exception(univ_cons(software_error("function `array2d.lookup\'/3: indices out of bounds")))
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Zeroes ^ elem(-1, -1) = exception(univ_cons(software_error("function `array2d.lookup\'/3: indices out of bounds")))
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Zeroes ^ elem(3, 0) = exception(univ_cons(software_error("function `array2d.lookup\'/3: indices out of bounds")))
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Zeroes ^ elem(0, 3) = exception(univ_cons(software_error("function `array2d.lookup\'/3: indices out of bounds")))
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Zeroes ^ elem(3, 3) = exception(univ_cons(software_error("function `array2d.lookup\'/3: indices out of bounds")))
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[11, 12, 13, 14, 15, 16]
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[21, 22, 23, 24, 25, 26]
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[31, 32, 33, 34, 35, 36]
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[41, 42, 43, 44, 45, 46]
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