## Using Conditional Expressions in Equations

### Statement Syntax

You can specify conditional equations by using if statements.

equations
[...]
if Expression
[...]
elseif Expression
[...]
else
[...]
end
[...]
end

Each [...] section may contain one or more equation expressions.

You can nest if statements, for example:

equations
[...]
if Expression
[...]
if Expression
[...]
else
[...]
end
else
[...]
end
[...]
end

### Restrictions

• Every if requires an else.

• The total number of equation expressions, their dimensionality, and their order must be the same for every branch of the if-elseif-else statement. However, this rule does not apply to the assert expressions, because they are not included in the expression count for the branch.

### Example

For a component where x and y are declared as 1x1 variables, specify the following piecewise equation:

This equation, written in the Simscape™ language, would look like:

equations
if x >= -1 && x <= 1
y == x;
else
y == x^2;
end
end

Another way to write this equation in the Simscape language is:

equations
y == if x>=-1 && x<=1, x else x^2 end
end