y = if condition then
The if-then-else expression evaluates a condition and makes y equal to the first expression if the condition is true and makes y equal to the second expression if the condition is true. If the condition is true, 20-sim ignores the second expression. If the condition is false, 20-sim ignores the first expression. Because the complete construct forms one expression, only one semicolon is used at the end.
If-then-else expression may be nested. Take care that no semicolons are used, because no matter how large the construct is, it is still one expression!
y = if time > 5 then
-ramp(1) // statement to be executed if condition is true,
ramp(1) // statement to be executed if condition is false,
x = if time < 1 then
if time < 2 then
if time == 2 then
|1.||The output of the condition must be a boolean.|
|2.||If needed, always use the equal operator (==) in the condition.|
|1.||Take care when using event functions in if-then-else expressions. In if-then-else expressions only the equations of the true parts are evaluated, so event functions may not always be triggered!|
|2.||There is also an if-then-else statement.|
|3.||Equations within an if statement have to be written in the correct order of execution, i.e. they are not rewritten into a causal form but executed sequentially.|