# General

- [ISMATRIXPSD](/functions/general/ismatrixpsd.md): Verify if a matrix is positive semidefinite. Solve for the nearest positive semidefinite matrix if it is not.
- [MATRIX](/functions/general/matrix.md): Concatenate disjointed arrays in Excel column (or row)-wise into a matrix
- [XLABHELP](/functions/general/xlabhelp.md): Getting help within Excel for the Excel Lab quant library.
- [XLABINFO](/functions/general/xlabinfo.md): Retrieve information about the Excel Lab quant library installed on your workstation.
- [XLABLICENSE](/functions/general/xlablicense.md): Invoke authentication with licensing servers to enable or re-enable your use of Excel Lab.
- [RESETPASSWORD](/functions/general/resetpassword.md): Update and set a new password for your user account