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jibal
3 months ago
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Adobe Photoshop 1.0 Source Code (1990)
i, j, k comes from FORTRAN's implicit types -- by default, names starting with I-N are integers and all other names are real.
jcelerier
3 months ago
[–]
this is much older ; Joseph Fourier was already using "i" and "j" for indices in the 1800s. See page 209:
https://www.google.ca/books/edition/OEuvres_de_Fourier_Th%C3...
jibal
3 months ago
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parent
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The context is i, j, k as indices in programs. No doubt FORTRAN was influenced by prior use such as you cite. But in no case does i used as an index come from i designating an imaginary number, which is what I aimed to refute.
zeckalpha
3 months ago
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Representing dimensions as indexable rows and columns of vectors or matrices was done on paper in the 1800s.
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