_hot_ — Matrix Regedit

For most matrix applications, (compact, fast) or REG_SZ with JSON (human-readable, flexible) is preferred. 3. Encoding Matrices in the Registry 3.1 Binary Encoding (Fixed-Size Numeric Matrix) Store matrix dimensions (rows, cols) and element values in a single REG_BINARY value.

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);

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

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));

[rows:4 bytes][cols:4 bytes][data: rows×cols × element_size] For most matrix applications, (compact, fast) or REG_SZ

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 |

Set-ItemProperty -Path $path -Name "MatrixBinary" -Value ([byte[]]$bytes) -Type Binary $readBytes = (Get-ItemProperty -Path $path -Name "MatrixBinary").MatrixBinary $rowsRead = [BitConverter]::ToInt32($readBytes, 0) $colsRead = [BitConverter]::ToInt32($readBytes, 4) $matrix = @() for ($i = 0; $i -lt $rowsRead * $colsRead; $i++) $offset = 8 + $i * 4 $matrix += [BitConverter]::ToSingle($readBytes, $offset) | Method | Read Speed | Write Speed

Example: 2×3 matrix of 32-bit floats (24 bytes data + 8 header = 32 bytes total).