Solucionador

Opens the Solver dialog. A solver allows you to solve mathematical problems with multiple unknown variables and a set of constraints on the variables by goal-seeking methods.

Solver settings

Target Cell

Enter or click the cell reference of the target cell. This field takes the address of the cell whose value is to be optimized.

Optimize results to

• Maximum: Try to solve the equation for a maximum value of the target cell.

• Minimum: Try to solve the equation for a minimum value of the target cell.

• Value of: Try to solve the equation to approach a given value of the target cell.

  Enter the value or a cell reference in the text field.

By Changing Cells

Enter the cell range that can be changed. These are the variables of the equations.

Limiting Conditions

Add the set of constraints for the mathematical problem. Each constraint is represented by a cell reference (a variable), an operator, and a value.

• Cell reference: Enter a cell reference of the variable.

  Click the Shrink button to shrink or restore the dialog. You can click or select cells in the sheet. You can enter a cell reference manually in the input box.

• Operator: Select an operator from the list. Use Binary operator to restrict your variable to 0 or 1. Use the Integer operator to restrict your variable to take only integer values (no decimal part).

• Value: Enter a value or a cell reference. This field is ignored when the operator is Binary or Integer.

• Remove button: Click to remove the row from the list. Any rows from below this row move up.

Opcions

Opens the Solver Options dialog.

El diàleg Opcions del solucionador permet seleccionar els diferents algoritmes de solucionador per a problemes lineals i no lineals i establir-ne els paràmetres de resolució.

Resol

Click to solve the problem with the current settings. The dialog settings are retained until you close the current document.

Per resoldre equacions amb el solucionador

L'objectiu del solucionador és trobar aquells valors variables d'una equació que donin un valor optimitzat a la cel·la objectiu, també anomenada "objectiu". Podeu triar si el valor de la cel·la objectiu ha de ser un màxim, un mínim o s'ha d'aproximar a un valor determinat.

Els valors variables inicials s'insereixen en un interval de cel·les rectangular que introduïu al quadre Canviant les cel·les.

Podeu definir una sèrie de condicions limitadores que posen restriccions a algunes cel·les. Per exemple, podeu establir la restricció que una de les variables o cel·les no siga més gran que una altra variable o que un valor determinat. També podeu definir la restricció que una o més variables siguen nombres enters (valors sense decimals), o bé valors binaris (on només es permet 0 i 1).

Using Non-Linear solvers

Regardless whether you use DEPS or SCO, you start by going to Tools - Solver and set the Cell to be optimized, the direction to go (minimization, maximization) and the cells to be modified to reach the goal. Then you go to the Options and specify the solver to be used and if necessary adjust the according parameters.

There is also a list of constraints you can use to restrict the possible range of solutions or to penalize certain conditions. However, in case of the evolutionary solvers DEPS and SCO, these constraints are also used to specify bounds on the variables of the problem. Due to the random nature of the algorithms, it is highly recommended to do so and give upper (and in case "Assume Non-Negative Variables" is turned off also lower) bounds for all variables. They don't have to be near the actual solution (which is probably unknown) but should give a rough indication of the expected size (0 ≤ var ≤ 1 or maybe -1000000 ≤ var ≤ 1000000).

Bounds are specified by selecting one or more variables (as range) on the left side and entering a numerical value (not a cell or a formula) on the right side. That way you can also choose one or more variables to be Integer or Binary only.