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1.TMP2:=STD(CLOSE,M);//求M個周期內的收盤價的標準差
2.
MID:MA(CLOSE,N);TMP2:=STD(CLOSE,M);TOP:MID+P*TMP2;BOTTOM:MID-P*TMP2;BB:(C-BOTTOM)/(TOP-BOTTOM);
BB的數值太小，導致的K線被壓縮，可以按下面修改，只顯示數值，不顯示畫線
MID:MA(CLOSE,N);
TMP2:=STD(CLOSE,M);
TOP:MID+P*TMP2;
BOTTOM:MID-P*TMP2;
BB:(C-BOTTOM)/(TOP-BOTTOM),NODRAW;