IF

Adams Basic Package > Adams View > View Function Builder > Run-Time Functions > Functions: A - M > IF

IF

Allows you to conditionally define a function expression.

Note:

Using the IF function will likely cause discontinuities in the derivatives of the function evaluation, which can cause the integrator to decrease the time step size or fail. We recommend that you use the STEP function instead of the IF.

Format

IF(Expression1: Expression2, Expression3, Expression4)

Arguments

Expression1	The expression Adams evaluates.
Expression2	If the value of Expression1 is less than 0, IF returns Expression2.
Expression3	If the value of Expression1 is 0, IF returns Expression3.
Expression4	If the value of Expression1 is greater than 0, IF returns Expression4.

Example

In the following illustration, the expression returns different values depending on the value of the variable called time:

Function	IF(time-2.5:0,0.5,1)
Result	0.0 if time < 2.5 0.5 if time = 2.5 1.0 if time > 2.5

Learn more about constants and variables.