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dotSCAD/docs/lib3x-m_replace.md
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# m_replace
It replaces the aᵢⱼ element of a matrix.
**Since:** 3.3
## Parameters
- `m` : A matrix.
- `i` : The i-th row.
- `j` : The j-th column.
- `value` : The new value.
## Examples
use <matrix/m_replace.scad>
original_m = [
[1, 2, 3, 4],
[5, 6, 7, 8],
[9, 10, 11, 12]
];
expected = [
[1, 2, 3, 4],
[5, 6, 70, 8],
[9, 10, 11, 12]
];
actual = m_replace(original_m, 1, 2, 70);
assert(actual == expected);