Crossword

Transcribed from the printed issue; not yet reviewed. Read it in the PDF of the issue, page 39

Crossword¶

Across¶

1. All done
2. A≥~⊃C[D] for Boolean A
3. The remainder of B÷A
4. How many elements in each row of D do not match the corresponding element in vector B?
5. Round C up to the nearest integer
6. A≡B for same length vectors A and B
7. N formatted to D decimal places
8. The largest number in the vector E×B
9. 1⍴C for scalar C
10. How many
11. How many numbers in vector A are bigger than B (omit the A)?
12. From ⍳B select N random numbers, without repeats
13. The Boolean vector B with all but its first 1 converted to 0s
14. ⍟(*C)×(*B)
15. ,+/B=B for vector B
16. (+/V[1 3 5 7 ...])-(+/V[2 4 6 8 ...])
17. B[___] to put B in sorted order
18. (~V∊D)/V
19. Once V is true
20. (+\C⍴C=C)-~⎕IO for scalar C
21. Product of V
22. (⌽⍳⍴⍴N)⍉N
23. (N↓B),(N↑B) for positive N on vector B, where N≤⍴B
24. 1-poles in Boolean vector V to 1-maps:
    0 1 0 0 0 0 1 0 0 → 0 1 1 1 1 1 0 0 0
25. ×/⍳C in origin 1
26. (×/V[1 3 5 7 ...]÷(×/V[2 4 6 8 ...])
27. Half of V, rounded to an integer
28. A times pi
29. The leading true bits in Boolean V
30. The smallest number in vector V
31. M⍱~∧/V, for matrix M, vector V

Down¶

1. Go to line L
2. +/A×B for vectors A and B
3. 0≠+/A∊B for scalar B (omit the A)
4. (D<B)∨(D>B)
5. What’s hiding in the scalar A?
6. The values in A, but not less than N
7. The absolute value of C
8. Which columns of matrix B have numbers that are all less than the scalar D?
9. A+⌈/B for scalar A, vector B
10. Stick vector D onto the left side of matrix B
11. The number C in characters that look like it
12. The largest number in vector B (or negative infinity if B is empty)
13. The indices to extract from (E⍴0),D the elements of D sorted according to the collating sequence C
14. Cumulative sum of V
15. D[N⍴⍳⍴D]
16. (⍳0)⍴1?B
17. V[1]<V[2] for two-element vector V
18. Cumulative alternating sum
19. Where B is first seen in vector V
20. C=0 for Boolean C
21. Are any of V true?
22. (?N⍴V[1]),(?N⍴V[2]) in origin 1
23. Cumulative product of V
24. The number of different combinations of A items taken N at a time
25. C[(⎕IO+⍴C)-⍳⍴C]
26. Parity of Boolean vector V, i.e. 2|+/V
27. ,+/V≠0 for vector V
28. Cumulative alternating product
29. Circumference of circle of diameter D
30. All
31. M, enclosed into a nested scalar

Solution to Crossword in 17.4¶

[Errata: There were a couple of typos in the last crossword. In 6 down Lawrence Welk was mis-spelled as Lawrence Wall; 8 down should have been The greater of BV or M; and 19 and 20 down were marked one square too far left on the grid.]

[Vector Production]¶

Following an interesting run-in with Word2000 and shaded table-cells, the crosswords are now being generated in NewLeaf and linked to the Word document as metafiles! Moral: never upgrade your word-processor under time-pressure.