Tongda letter is a multifunctional securities information platform. Compared with other market software, it has the advantages of simple interface and faster market update. Communication allows users to divide the screen freely and specify the content corresponding to each block. Here are three commonly used index formulas for the main map of communication letters.

1, the lower limit of the main map of communication letter.

n:= 20；

MB:MA(CLOSE，N)；

Upper rail: MB+STD (closed, n);

Lower rail: MB-STD (closed, n);

Upper limit: MB+2*STD(CLOSE, n);

Lower limit: MB-2*STD(CLOSE, n);

Adhesion line (OPEN & gt=CLOSE, CLOSE, open, 9,0), coloraaaaaaa；;

Glue line (OPEN & gt=CLOSE, CLOSE, open, 6,0), COLORBBBBBB.

Glue line (OPEN & gt=CLOSE, CLOSE, open, 2.4,0), COLORCCCCCC.

Adhesive line (OPEN & gt=CLOSE, CLOSE, open, 1. 1, 0), COLORDDDDDD.

Adhesive line (off > on, off, on, 9, 0), COLOR6666CC.

Adhesive line (off> on, off, on, 6, 0), COLOR7777DD.

Adhesive line (off > on, off, on, 2.4,0), COLOR8888EE.

Adhesion line (off> on, off, on, 1. 1, 0), COLOR9999FF.

Adhesion line (off > on, low, 0.5,0), color1199ff;

Adhesion line (closed & gt opening and closing, high, 0.5,0), color1199ff;

Adhesive line (open & gt=CLOSE, CLOSE, LOW, 0.5, 0), COLORCCCCCC.

2, Tongda letter Wolong main map indicators

DIFF:=EMA (closing, 12)-EMA (closing, 26);

DEA:=EMA(DIFF，9)；

MACD:= 2 *(DIFF-DEA)；

H9:=HHV(C，9)，LINETHICK 1，COLORGRAY

L9:=LLV(C，9)，LINETHICK 1，COLORGRAY

RSV9:=MA((CLOSE-LLV (low, 9))/(HHV (high, 9)-LLV (low, 9))* 100, 3);

K9:=SMA(RSV9，3， 1)，COLORBLACK，line thick 1；

D9:=SMA(K9，2， 1)，COLOR009500，line thick 1；

J9:=2*K9- 1*D9，COLORRED，line thick 1；

k:= J9；

YYCXTJ:=CROSS(K，80)；

YYCXT:= bars last(YYCXTJ)；

YYCXTO:=REF(O，YYCXT)；

Multiple defensive positions: =YYCXTO, COLORRED, linethick1;

YYCXT 1:=REF(C，YYCXT)；

Short permutation: =CROSS(20, k);

KT:=BARSLAST (short arrangement);

Short: =REF(O，KT)；

Empty defensive position: = empty, COLORBLUE, line thick1;

Short 1:=REF(C，KT)；

MA9:=MA(CLOSE，9)，COLORMAGENTA，line thick 1；

DRAWBAND(H9，RGB(255，2 17，40)，L9，RGB(255，255，255))；

STICKLINE(MACD=0)，H9，L9，3.8，0)，COLORFEFBC9

G:H9，COLORLIGRAY

D:L9，COLORLIGRAY

Balance line: MA9, COLORMAGENTA, linethick1;

Oscillating lines: LLV (balance line, 2), COLORBLACK, line thick1;

Shareholding line: balance line-(shock line-balance line), COLORBLACK, line thick1;

Adhesion line (C adhesion line (C>O, O, C, 2, 0), COLORRED

Adhesion line (C>o, h, l, 0,0), COLORRED

H45:HHV(C, 45), LINETHICK 1, color blue;

L45:LLV(C, 45), LINETHICK 1, color blue;

3. The main map indicators of strong watershed have no future.

var 1:= 1；

VAR2:= (high+low+on+off)/4;

VAR3:=EMA(VAR2， 13)-EMA(VAR2，34)；

VAR4:=EMA(VAR3，5)；

var 5:=(var 3-var 4)* 5；

var 6:= IF(var 5 & gt； = 1000， 1000，IF(var 5 var 7:= REVERSE(var 2)+2 *(MA(LOW， 18)+ 1.6*STD(LOW， 18))；

VAR8:=(REF(HIGH， 1)+(HIGH-REF(HIGH， 1))* VOL/CAPITAL)* 1.095；

Watershed: forecast (forecast (var 6,32), 10)*VAR 1, LINETHICK2, COLOR339999.

rise:IF(var 6 & gt； Watershed, VAR6, watershed) *VAR 1, COLOR0000FF

Support: reverse +2* watershed *VAR 1, COLOR0066FF.

Fall: IF(VAR6 resistance: reverse +2* watershed *VAR 1, COLORFF0000.

Super: MA (low, 50)+2*STD (low, 50)*VAR 1, LINETHICK 1, COLOR66CCCC.

EMA(VAR8， 150)*VAR 1，POINTDOT，COLORF00FF0，LINETHICK2

EMA(VAR8，6)*VAR 1，POINTDOT，COLOR339999，LINETHICK2

Tip: Both Tong Daxin's stock selection formula and his own writing are based on certain foundation and experience. There is no 100% stock selection formula to make money. Just because the stock selection formula is accurate now does not mean that it will be accurate in the future.