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Student Support Forum > General > > "Plot:: write: Tag times in t/t_f is protected."

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Original Message (ID '42287') By jf:
You were using a fraction as a variable name. The independent variable in the domain specifier is repeatedly assigned values and you can't assign values to a fraction (example: t/tf = 0). I second Bill's comment that subscripts take work to do right. You can start by reading http://reference.wolfram.com/mathematica/Notation/tutorial/NotationSymbolizeAndInfixNotation.html, about 60% of the way down, about the Symbolize function and the Notations Palette. A notebook Tech Support sent me about making subscripted variables is attached.