This page contains a JavaScript program that implements the algorithm. The input starts with two numbers indicating the size of the grid to be used and the number of times it is copied in both direction. This is followed by the elements (taken from 0, 11, 12, 13, 14, 21, 22, 23, 24, 25, 26, 31, 32, 33, 34, and 40) that should be used. The number of elements must be equal to the grid size. Next the choice principle for the distribution has to be given, which is one of VERTIDUB, SERCYDUB, SERBIDUD, RATIOSUB, or ALEDUB. When one of the later three is used, the choice pattern has to be given with numbers starting from 1 up to including the grid size. The number of numbers that are needed equals the square of the grid size. Examples for imput will be given with the description of works below.
Output generated by program:
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Below a black and white image of the output is given.
10 2 40 40 40 40 40 40 0 11 14 22 SERCYDUB |
10 2 40 40 40 40 40 0 21 23 26 26 SERCYDUB |
4 5 0 0 32 34 SERCYDUB |
Below the input matching the description given in [1] and [2]. This work could be generated with the given input, except for six differences that it contains with respect to the inverted design. The squares at the locations (row,column): (19,14), (20,13), (20,14), (21,13), (21,14), and (22,13) should have been white to match the inverted design. The work is reproduced in [1] and [2]. A photograph of the work is given in Bad thoughts.
4 5 40 40 11 13 SERCYDUB |
4 7 0 0 32 34 SERCYDUB |
Below the input matching the description given in [1] and [2]. The reproductions in these publications are inverted and reproduced upside-down (rotated over 180°) from the design. Nevertheless the upside-down reproduction, these could still be generated with the given input, due to the fact that the elements 11 and 13 are eachothers match when rotated 180°.
4 7 40 40 11 13 SERCYDUB |
4 7 0 0 21 22 ALEADUB 3 1 2 4 1 1 2 3 1 1 3 1 2 2 2 3 |
The input matching the description given in [1] is:
4 7 40 40 23 24 ALEADUB 3 1 2 4 1 1 2 3 1 1 3 1 2 2 2 3 |
Although this would match the work if it was only inverted according to the above mentioned design, but it is also rotated by 180°. The work could be generated by the input given below. The work is also reproduced in [3], but the title and description are from Computerstructuur 3A.
4 7 40 40 21 22 ALEADUB 3 2 2 2 1 3 1 1 3 2 1 1 4 2 1 3 |
The above input does match with the description given in [2], but the reproduction has been rotated clockwise by 90°. This reproduction could be produced by the following input:
4 7 40 40 22 23 ALEADUB 4 3 1 3 2 2 3 2 1 1 1 2 3 1 1 2 |
4 7 0 0 21 22 ALEADUB 4 1 2 1 1 4 4 1 4 2 4 1 1 4 1 4 |
The reproduction in [1] and [2] is inverted and rotated counter clockwise by 90° with respect to the design on the computer listing. This reproduction could be produced by the following input:
4 7 40 40 22 23 ALEADUB 1 1 1 4 2 4 4 1 1 4 2 4 4 1 4 1 |
The description given in [1] does not match the reproduction, because it is like the inversion from the computer listing without the rotation, with this difference that the last 1 on the first row is changed into a 4. The input matching the description is:
4 7 40 40 23 24 ALEADUB 4 1 2 4 1 4 4 1 4 2 4 1 1 4 1 4 |
For the description in [2] the pattern has been rotated, but the elements have not been adapted and do not match the reproduction. This description is also given in [3] with a reproduction of Computerstructuur 3. The input matching the description is:
4 7 40 40 21 22 ALEADUB 1 1 1 4 2 4 4 1 1 4 2 4 4 1 4 1 |
4 7 0 0 22 25 ALEADUB 4 4 4 4 1 1 1 2 2 1 2 2 3 3 1 4 |
The reproduction in [1] and [2] is inverted with respect to the design on the computer listing, except for two differences that it contains with respect to the inverted design. The squares at the rows 29 and 30 and column 18 should have been white. The description match the reproduction. The input matching the description is:
4 7 40 40 24 26 ALEADUB 4 4 4 4 1 1 1 2 2 1 2 2 3 3 1 4 |
4 7 0 0 22 25 ALEADUB 3 2 2 1 4 4 2 2 1 2 3 1 3 4 2 2 |
The reproduction in [1] and [2] is inverted and turned up-side down with respect to the design on the computer listing, except for two differences that it contains with respect to the inverted design. The square at row 11 and column 45 should have been black and the square on row 24 and column 22 should have been white. The reproduction could be produced by the following input:
4 7 40 40 22 26 ALEADUB 2 2 4 3 1 3 2 1 2 2 4 4 1 2 2 3 |
The descriptions given in [1] and [2] match reproductions if these would not be turned up-side down. The input description matching the description is:
4 7 40 40 24 26 ALEADUB 3 2 2 1 4 4 2 2 1 2 3 1 3 4 2 2 |
2 10 21 40 VERTIDUB |
2 10 0 21 VERTIDUB |
The work is inverted with respect to the design. The reproductions and the description given in [1] and [2] match the work. The input matching the description is:
2 10 23 40 VERTIDUB |
2 14 25 26 SERCYDUB |
2 14 25 26 VERTIDUB |
3 9 21 21 23 SERCYDUB |
The reproduction in [2] has been rotated clock-wise by 90° and contains one difference with respect to the design. The square at row 33 and column 42 should have been black. The input matching the description with which the reproduction could be generated, is:
3 9 22 22 24 ALEADUB 1 3 2 3 2 1 2 1 3 |
4 7 22 22 22 24 RATIODUB 4 1 4 2 2 3 3 4 2 1 3 1 2 4 1 3 |