Matrix Regedit ((hot)) Instant

HKEY_CURRENT_USER\Software\MyMatrix row0 (key) col0 = 1 (REG_DWORD) col1 = 2 (REG_DWORD) col2 = 3 (REG_DWORD) row1 col0 = 4 col1 = 5 col2 = 6 This is intuitive but creates many keys; poor for large matrices. 4.1 Using PowerShell (Binary Matrix Example) # Write a 2x3 float matrix to registry $path = "HKCU:\Software\MatrixDemo" New-Item -Path $path -Force | Out-Null $rows = 2 $cols = 3 $data = @(1.0, 2.0, 3.0, 4.0, 5.0, 6.0) $bytes = [System.Collections.ArrayList]::new() $bytes.AddRange([BitConverter]::GetBytes($rows)) $bytes.AddRange([BitConverter]::GetBytes($cols)) foreach ($val in $data) $bytes.AddRange([BitConverter]::GetBytes([float]$val))

RegSetValueExW(hKey, valueName, 0, REG_BINARY, buffer.data(), (DWORD)totalSize); RegCloseKey(hKey); Logical naming prevents collision and improves readability.

"rows": 3, "cols": 3, "data": [[1,2,3],[4,5,6],[7,8,9]] matrix regedit

Value: 02 00 00 00 03 00 00 00 00 00 80 3F 00 00 00 40 00 00 40 40 00 00 80 40 00 00 A0 40 00 00 C0 40 Interpretation: - rows = 2 (little-endian) - cols = 3 - data = [1.0, 2.0, 3.0, 4.0, 5.0, 6.0] as float32 Store matrix as JSON string in REG_SZ .

Write-Host "Matrix ($rowsRead x $colsRead): $matrix" #include <windows.h> #include <vector> #include <cstdint> void WriteBinaryMatrix(HKEY root, LPCWSTR subkey, LPCWSTR valueName, const std::vector<float>& data, uint32_t rows, uint32_t cols) HKEY hKey; RegCreateKeyExW(root, subkey, 0, NULL, REG_OPTION_NON_VOLATILE, KEY_SET_VALUE, NULL, &hKey, NULL); void WriteBinaryMatrix(HKEY root

[rows:4 bytes][cols:4 bytes][data: rows×cols × element_size]

size_t totalSize = 8 + data.size() * sizeof(float); std::vector<uint8_t> buffer(totalSize); memcpy(buffer.data(), &rows, 4); memcpy(buffer.data() + 4, &cols, 4); memcpy(buffer.data() + 8, data.data(), data.size() * sizeof(float)); uint32_t cols) HKEY hKey

HKEY_LOCAL_MACHINE\SOFTWARE\CompanyName\Product\Matrices ├── TransformMatrix │ Type = REG_SZ "binary" │ Data = REG_BINARY ... ├── LookupTable_3x4 │ Type = REG_SZ "json" │ Data = REG_SZ "..." └── UserPrefMatrix rows = REG_DWORD 5 cols = REG_DWORD 5 data_0_0 = REG_DWORD 1 ... | Method | Read Speed | Write Speed | Memory Overhead | Max Practical Size | |--------|------------|-------------|-----------------|--------------------| | Binary | Very fast | Fast | Low | ~1 MB (registry limit) | | JSON | Medium | Medium | Medium | 64 KB (REG_SZ limit) | | Row-per-key | Slow (many lookups) | Slow | High | Hundreds of keys |