About "warning: implicit conversion from matrix to string"

[cookyzhao]

Each time, when i try to export an emf formatted picture, there is a warning
message "warning: implicit conversion from matrix to string" for octave
3.2.4.  

I really wonder why i get this message, and what should i do to correctly
export such emf files?


for example:

print -demf "-S640,480" test.emf
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