subset
value(index)
value(index) = replacement
subset(value, [index])
subset(value, [index], replacement)
Get or set a subset of the entries of a matrix or characters of a string. Indexes are one-based. There should be one index specification for each dimension of the target. Each specification can be a single index, a list of indices, or a range in colon notation `l:u`. In a range, both the lower bound l and upper bound u are included; and if a bound is omitted it defaults to the most extreme valid value. The cartesian product of the indices specified in each dimension determines the target of the operation.
Try it yourself:
| $1 | d = [1, 2; 3, 4]
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| $2 | e = []
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| $3 | e[1, 1:2] = [5, 6]
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| $4 | e[2, :] = [7, 8]
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| $5 | f = d * e
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| $6 | f[2, 1]
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| $7 | f[:, 1]
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| $8 | f[[1,2], [1,3]] = [9, 10; 11, 12]
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| $9 | f
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