ComfyUI Node: Math Expression (mtb)

Math Expression (mtb):

The Math Expression (mtb) node is designed to evaluate simple mathematical expressions provided as strings. This node is particularly useful for AI artists who need to perform quick and straightforward calculations within their workflows without delving into complex coding. By leveraging this node, you can input a math expression and get the evaluated result, which can be either a floating-point number or an integer. The node intelligently handles placeholders within the expression, replacing them with actual values provided in the input, and supports basic arithmetic operations. It ensures that even if the expression syntax is incorrect, meaningful error messages are provided to guide you in correcting the input.

Math Expression (mtb) Input Parameters:

expression

The expression parameter is a string that contains the mathematical expression you want to evaluate. This expression can include basic arithmetic operations such as addition, subtraction, multiplication, division, and exponentiation. You can also use placeholders within the expression, which will be replaced by actual values provided in the input. The default value is an empty string, and it supports multiline input to accommodate more complex expressions. This parameter is crucial as it defines the calculation to be performed by the node.

Math Expression (mtb) Output Parameters:

result (float)

The result (float) output parameter provides the evaluated result of the mathematical expression as a floating-point number. This output is essential for scenarios where precision is required, and the result may not be a whole number.

result (int)

The result (int) output parameter gives the evaluated result of the mathematical expression as an integer. This output is useful when you need the result in a whole number format, rounding down any decimal values.

Math Expression (mtb) Usage Tips:

• Ensure that your mathematical expression is correctly formatted and uses valid arithmetic operators. For example, use ** for exponentiation instead of ^.
• Utilize placeholders in your expression to dynamically replace them with actual values during execution. This can be particularly useful for repetitive calculations with varying inputs.
• If your expression is complex, use the multiline input feature to make it more readable and manageable.

Math Expression (mtb) Common Errors and Solutions:

The expression syntax is wrong '<expression>': <error_details>

• Explanation: This error occurs when the syntax of the provided mathematical expression is incorrect, making it impossible to evaluate.
• Solution: Review the expression for any syntax errors, such as missing operators or mismatched parentheses. Ensure that all placeholders are correctly formatted and replaced with valid values.

Error evaluating expression '<expression>': <error_details>

• Explanation: This error indicates that there was an issue while evaluating the expression, possibly due to invalid operations or unsupported characters.
• Solution: Check the expression for any unsupported characters or operations. Ensure that all arithmetic operations are valid and that the expression does not contain any undefined variables or placeholders.