Expressions

Many parameters in MatterCAD accept mathematical expressions instead of plain numbers. This enables parametric design where changing one value automatically updates related dimensions.

How to Use

Instead of typing a plain number in a parameter field, you can type a math expression. For example:

• 20 + 5 evaluates to 25
• pi * 10 evaluates to 31.416
• width * 2 references another parameter named “width”

Available Constants

• pi - 3.14159… (the ratio of circumference to diameter)
• tau - 6.28318… (2 * pi, a full revolution in radians)

Supported Operations

• Addition: +
• Subtraction: -
• Multiplication: *
• Division: /
• Parentheses: ( and ) for grouping

Tips

• Expressions are supported in any field that shows DoubleOrExpression, IntOrExpression, or StringOrExpression in the code – in practice, most numeric fields in design tools accept them
• Use expressions to create relationships between parameters – for example, set a hole’s diameter to outer_diameter - 4 so it always has 2mm walls
• Expressions update automatically when referenced values change
• You can use expressions in Array operations to create parametric patterns

Related

• Components - Create reusable parameterized designs
• Editing Objects - Working with object parameters