SymmetricMatrix

SymmetricMatrix[smat] converts the symmetric matrix smat to a structured array.

Examples

Create symmetric matrix:

m = {{1, 2, 3}, {2, 4, 5}, {3, 5, 6}};
SymmetricMatrix[m]

Check structure:

StructuredArray[SymmetricMatrix, 3]

Normal form:

Normal[SymmetricMatrix[m]]

Please visit the official Wolfram Language Reference for more details.