XYGraph ¿ÀºêÁ§Æ®ÀÇ ³»¿ëÀ» ÃʱâȽÃŲ´Ù.
void XYGraphClear(string class_name);
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string class_name XYGraphÀÇ Class Name ÀÌ µÈ´Ù.
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@XYGraphClear("XYGraph1");
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