go / expert
Snippet
Multi-Dimensional Array Index Folding into Contiguous Storage
Fixed multi-dimensional arrays in Go occupy contiguous blocks of memory in row-major order. Explicitly folding 2D matrix indices (i*stride + j) into a 1D flat array ensures deterministic stack layout without requiring dynamic slice allocations.
snippet.go
go
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package mainimport "fmt"func FlattenMatrix3x3(matrix *[3][3]float64) [9]float64 {var flat [9]float64for i := 0; i < 3; i++ {for j := 0; j < 3; j++ {flat[i*3+j] = matrix[i][j]}}return flat}func main() {m := [3][3]float64{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}f := FlattenMatrix3x3(&m)fmt.Println(f)}
Breakdown
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func FlattenMatrix3x3(matrix *[3][3]float64) [9]float64 {
Takes a pointer to a 2D fixed array [3][3]float64 to avoid passing array contents by value.
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var flat [9]float64
Allocates a 1D target fixed-size array on the stack.
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flat[i*3+j] = matrix[i][j]
Folds multi-dimensional row and column indices into a linear index for contiguous memory placement.