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Fix doc. about linear from/to Cartesian indices #49343

Merged
merged 1 commit into from
Apr 13, 2023
Merged

Fix doc. about linear from/to Cartesian indices #49343

merged 1 commit into from
Apr 13, 2023

Commits on Apr 13, 2023

  1. Fix doc. about linear from/to Cartesian indices 

    Since Julia (ordinary) arrays have 1-based indices and are in column-major order, the linear index `k` and the Cartesian index `(i,j)` of an element in a `m×n` Julia array are related by: `k = i + m*(j - 1)`. The examples of conversion between linear and Cartesian indices in the doc. use incorrect formulae although the results were correct in the specific element at `(1,3)`. This can be easily checked for other indices than `(1,3)` with a simple `2×3` array (as in the examples) built by `A = reshape(collect(1:6),2,3)`.
    @emmt
    emmt authored Apr 13, 2023
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