Dear Wolfgang, Now, I understand why the error messages “\texfont0 is undefined”, “ you used the started character from an undefined font family.” are appeared.
Thank you for your clear explanation. Best regards, Dalyoung >> 3. removing \starttext, \stoptext, and functionstyle=“math”, it worked. >> However the caption >> “x=[…]; y=[….]” is overlapped. > > ConTeXt doesn't preload fonts and only when no font was set untill \starttext > latin modern is used as fallback font at this point. > > When you omit \starttext no font is loaded and when you use math mode (which > is the case when you use funtionstyle=math) the error message appears. > Another fallback in this case it to load a monospaced font in horizontal or > vertical boxes which is what you set in your example when you remove > \starttext.
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