Custom Calculation in Result Table

This topic describes how to create custom calculations in the Result Table using User Columns.

Note that majority of calculations require chromatogram to be calibrated. Without it the necessary values are not available.

Caution:

User Columns are stored in .dsk files. If the station is used by multiple users it is recommended to set shared .dsk file as described in chapter "Sharing settings among users".

How to add User Columns to Results Table

  1. Open a chromatogram you want to work with and switch to Results tab.
  2. Right click on the Result Table and select User Columns - Add... ⓐ, the Add User Column dialog will be opened.

  1. Fill in the Title ⓑ of the new column. In our case Ratio Area/ISTD.
  2. Check/Uncheck Calculate Total ⓒ (depends on whether sum of calculated values has a meaning).
  3. Fill in Expression ⓓ line , which presents the user's defined calculation. In our case:
    • In Columns: ⓔ list double-click Area.
    • In Opers: ⓕ list double-click /.
    • In Columns:list select Area, then click on Special Values ⓖ, select Compound ⓗ, choose ISTD ⓘ and click OK.
  4. Fill in appropriate Units ⓙ based on the formula.
  5. Click OK ⓚ in the Add User Column dialog.

    6. Note:

    It is possible to fill Expression by typing if you know the correct syntax.

  1. New User Column is added to the Result Table ⓛ.

Note:

You can edit existing User Columns by right-clicking into them and selecting User Columns - Edit Selected....