MATLAB can't find some commands such as fsolve or optimoptions

I was creating a function that required fsolve, and when I would run it, the message "Undefined function 'fsolve' for input arguments of type 'function_handle'." would return. Entering help fsolve in the command window yielded 'fsolve not found.'

Answer 1

[Walter Roberson]

It sounds as if you do not have the Optimization toolbox installed, or else not licensed.