I'm not sure I understand your question.
Are you asking about how to pass input arguments into a function? If so see this documentation page.
Are you asking how to prompt the user to enter data interactively inside your function? If so look at the input or inputdlg functions, but realize that if you call those functions inside your function then every time your user calls your function they will need to enter the data; you can't call input or inputdlg but "automatically fill in the data".
Are you asking how to ignore input arguments or output arguments in a function definition or a function call respectively? See this documentation page for inputs and this page for outputs.
If those aren't what you were asking, please add some clarification about what exactly you're trying to do.
