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<source lang=apl inline>⍴r</source> is the [[shape]] of our array of radii. Now, you remember <source lang=apl inline>⍳</source>, [[#Generating_indices|right]]? As it turns out, it can actually generate of an array of any number of dimensions; two in our case: | <source lang=apl inline>⍴r</source> is the [[shape]] of our array of radii. Now, you remember <source lang=apl inline>⍳</source>, [[#Generating_indices|right]]? As it turns out, it can actually generate of an array of any number of dimensions; two in our case: | ||
<source lang=apl> | <source lang=apl> | ||
⊢indices←⍳⍴sizes | |||
┌───┬───┬───┬───┬───┐ | ┌───┬───┬───┬───┬───┐ | ||
│0 0│0 1│0 2│0 3│0 4│ | │0 0│0 1│0 2│0 3│0 4│ |