Initial guess leads to undefined function value

Solution Number: 1192
Title: Initial guess leads to undefined function value
Platform: All Platforms
Applies to: COMSOL Multiphysics
Versions: All versions
Categories: Error Messages

Problem Description

An error "Initial guess leads to undefined function value" occurs.


This error message usually appears when you have set up an expression that returns “not a value”; that is, it is undefined for the initial condition you have set. For instance, this happens if an expression contains a divisor that becomes zero or a logarithm of a negative value. To solve such a problem, change the expression or the initial value so that the expression is well-defined when substituting the initial value of the variables. Also, watch out for warnings in the Log window.


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