Constraint Type "Formula"

The area below the constraints list contains the graphic display of the planned measurement points and the specified limitation of the area.

In case of undesired measurement regions that depend on complex dependencies amongst inputs, map/curve-based constraints may not help. But, if the dependency can be described as a mathematical condition amongst inputs and/or loaded parameters, formula-based constraints can be applied.

Formula Definition

Use the "Low Limit" and "High Limit" fields to specify lower and upper limits for the formula. The fields require scalar numerical inputs.

Use the "Condition" combo boxes to select comparison operators. Available operators are none (if you want to specify no lower or upper limit), < (less than) and <= (less or equal).

Use the "Formula Expression" field to enter the formula. Variables can be either inputs or curves/maps (1D or 2D) that are selected and managed in the "Inputs" area and the "Parameters" area. Operators are entered directly or via the Closed button area.

	Inserts the .* or ./ or + or - operator into the expression. This results in line-wise multiplication or division or addition or subtraction.
	Inserts the sqrt( operator into the expression. You have to add the closing bracket.
	Inserts the .^ operator into the expression. x.^y means line-by line y^th power of x.
	Inserts the abs( operator into the expression. You have to add the closing bracket.
	Inserts the bswitch( operator into the expression. You have to add the closing bracket. See the button tooltip for a description.
	Inserts an opening or closing bracket into the expression.
	Inserts a comma into the expression.
	Inserts the min(/max( operator into the expression. You have to add a closing bracket. See the button tooltip for a description.
	Inserts the & operator into the expression, which means a logical element -wise AND.
	Inserts the \| operator into the expression, which means a logical element-wise OR.
	Inserts the cumsum( operator into the expression, which means the cumulated sum of a numerical sequence. You have to add a closing bracket
	Inserts the < /<= /== />= /> operator into the expression, which means is less than/is less than or equal to/equal to/is greater than or equal to/is greater than.
	Backspace key for the expression field.

Note
Complex numbers and NAN are not allowed as formula results. If your formula results in a complex number or NAN, a warning is issued in the plot area and in the log window. Correct your formula.

If the expression is violated, the corresponding measurement points are rejected. The effects of the limits created by the formula on the measurement points is displayed graphically on the left. The number of measurement points that are removed through all active constraints is given in the x axis label of the plot.

Inputs and Parameters

The "Inputs" list shows all inputs of the experiment plan that can be inserted in the "Formula Expression" field, either by typing its name or via the button.

The "Parameters" list shows all maps of the experiment plan that can be inserted in the "Formula Expression" field, either by typing its name or via the button. The buttons below the "Parameters" list can be used to create, import, delete, and edit a selected map.