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[REBOL] Nested blocks - retrieving and setting with variables

From: chalz:earthlink at: 24-Sep-2004 1:30

Howdy. First post in a long time; haven't been playing with REBOL much. However, I have a problem I wanted to handle in REBOL, and I'm kind of stuck at a point. Consider: matrix: [[0 1 2 3 4] [1 0 0 0 0] [2 0 0 0 0]] i: 2 j: 3 x: 5 I want to set one value within one of the nested blocks to another value. However, i and j are variable, and this is looped, and I need to modify i and j in the process of using them. For instance, this is what I've got right now, and I really don't like it: do rejoin compose ["matrix/" (i + 1) "/" (j + 1) ": " x] Also, I get x by comparing a couple values within matrix. For instance, in another language I work in that's C-like: min(mtx[si][ti + 1] + 1, mtx[si + 1][ti] + 1, mtx[si][ti] + cost); Shy of using 'pick' a dozen times, or compose like above, anyone have recommendations as to how best (simplest) to do that? I know I can do matrix/:i/:j But I can't do math on the variables there. Suggestions? Thanks. --Charles