MATLAB POLYSPACE RELEASE NOTES Manual do Utilizador descarregar pdf (Página 32)

100

101

2 Matrices and Arra ys

This matrix is almost the same as the one in the Dürer engraving and has

all the same “magic” properties; the only difference is that the two middle

columns are exchanged.

To make this

B into Dü rer’s A,swapthetwomiddlecolumns:

A = B(:,[1 3 2 4])

This says, for each of the rows of matrix B, reorder the elements in the order

1, 3, 2, 4. It produces

163213

51011 8

96712

41514 1

WhywouldDürergotothetroubleofrearrangingthecolumnswhenhecould

have used MATLAB ordering? No doubt he wanted to include the date of the

engraving, 1514, at the bottom of his m agic square.

2-10

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 239 240

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