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extract 1-based indices from a circular sequence within a range of a given index
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| getrange <- function(i, length, range){ | |
| sort(c( | |
| c(((i - 1) - c(1:range)) %% length + 1), | |
| i, | |
| c(((i - 1) + c(1:range)) %% length + 1) | |
| )) | |
| } | |
| ## example: get a vector of indices +/- 10 around i = 5 on the circular integer interval [1,100] | |
| getrange(i = 5, length = 100, range = 10) |
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