Contents - Index

New Parametric Table


New Parametric Table creates a new Parametric Table.  The Parametric Tables is used in EES to automate repetitive calculations with different values of one or more variables.  


A dialog window will appear into which information must be entered in order to construct the table.  The number of runs, which corresponds to rows in the table, is entered in the box at the top.  The table must be given a unique name in the edit box to the upper right of the dialog window.  All variables (both independent and dependent) that are to appear in the table are selected from the alphabetical list on the left.  To select a variable, click on its name or use the up/down arrows to move the cursor onto the name.  Hold the Shift key down to select a range of variable names. Click the Add button to move the selected variables to the list on the right.  (As a shortcut, double-clicking the mouse on a name in the list will both select and add that variable to the list on the right.)  The variables in the right-hand list will each be assigned a column in the Parametric Table in the order in which they appear in the list.  A variable can be removed from the table list on the right by clicking on its name in the right list and then clicking the Remove button or by double-clicking on its name.  Pressing the OK button will create the Parametric Table, overwriting any existing table.


The Parametric Table operates somewhat like a spreadsheet.  Numerical values can be entered in any of the cells.  Entered values are assumed to be independent variables.  Independent and dependent variables that calculated by EES are displayed in different fonts and colors as specified in the General Display table of the Preferences dialog. Entering a value in a table produces the same effect as setting that variable to the value with an equation in the Equations window.  Dependent variables will be determined and entered into the table when the Solve Table or Min/Max Table command is issued.  If a variable is set in the table, it should not also be set in the Equations window;  otherwise the problem will be over specified.  It is necessary to delete or comment out the equation that specified a variable whose value will be specified in the Parametric table.  The $IF ParametricTable directive allows the variable to be specified in both locations, but only one specification is used at any time.  Each row of the table is a separate calculation.  The independent variables may differ from one row to the next.  However, for every row, the number of independent variables plus the number of equations in the Equations window must equal the total number of variables in the problem.