請教簡單的畫圖

altubers

請問想在ab的圖上
當紅k時，畫一個向上的arrow
當黑k時，畫一個向下的arrow
就理解上 加了這行code...

IIf( Close > Open ,PlotShapes(shapeUpArrow,colorRed,0,High,10) , PlotShapes(shapeDownArrow,colorBlue,0,Low,10 ));


但為何出現了如圖的清況呢?

plotshapes

謝謝
也有用簡單的if else .. 但出來也是跟著點選的kbar 跑

moneymaker

用法錯誤....
參考 http://www.amibroker.com/guide/afl/iif.html

Please note that IIF is a function - so the result of evaluation is returned by that function and should be assigned to some variable. IIf always evaluates both TRUE_PART and FALSE_PART, even though it returns only one of them. Because of this, you should watch for undesirable side effects. The following example shows one common error made with IIF function: IIF( condition, result = 7, result = 9 ); // THIS IS WRONG Correct usage is: result = IIF( condition, 7, 9 ); /* 7 or 9 is *returned* and assigned to a variable depending on condition */

moneymaker

所以可行的做法如下

PlotShapes ( IIf( Close > Open, shapeUpArrow, shapeDownArrow), IIf( Close > Open, colorRed, colorGreen),0, IIf( Close > Open, Low-1,High+1));

altubers

謝謝，我在試試…

moneymaker

看妳的附圖 你要的好像是這樣

PlotShapes ( IIf( Close > Open, shapeUpArrow, shapeDownArrow), IIf( Close > Open, colorRed, colorGreen),0, IIf( Close > Open, HIGH+12,low-12));

altubers

感謝moneymaker
我剛也有試出來了

1. PlotShapes( IIf( C < O,shapeUpArrow ,shapeDownArrow ) ,IIf( C < O,colorRed ,colorGreen ),0,IIf( C < O,H ,L ) ,10) ;

複製代碼

只是在於我要應用的地方是
先求出特定的Direction方向後 劃出arrow... 就失敗了…

1. PlotShapes(IIf(  Direction =="R",shapeUpArrow,shapeDownArrow) ,IIf(  Direction =="R",colorRed ,colorGreen ),0,IIf(  Direction =="R",H ,L ),10);

複製代碼

感覺上c<o是k bar的欄位…  direction會是運算完的常數
反成了這樣子


努力破解中~~

altubers

太感謝moneymaker大了…
一開始那只是我在測試的… 原本想說應該是一樣的東西
但發現沒想的那麼簡單了

moneymaker

貼全文來看看....

altubers

1. function getNum(_value){
   
2.         biString = NumToStr(_value);         
   
3.         return  StrToNum(biString );
   
4. }
   
5. 
   
6. function getDirection(){     
   
7.     MAD  =  getNum( MA(C,10) < MA(C,30));
   
8.     VAD  =  getNum(  MA(V,10) < MA(V,30));
   
9.      //printf(" MAD  :"+MAD  +" VAD  :"+VAD  +"\n");
   
10.     Direction  =   "N";
    
11.     if(MAD  ==VAD   ) Direction  =   "R"; else Direction  =   "G";
    
12. 
    
13.     //printf(" Direction  :"+Direction  +"\n");
    
14.     PlotShapes(IIf(  Direction =="R",shapeUpArrow,shapeDownArrow) ,IIf(  Direction =="R",colorRed ,colorGreen ),0,IIf(  Direction =="R",H ,L ),10);      
    
15. }

複製代碼

目前測試是拿ma 和mv來計算…arrow到是隨著點到的k bar而改變

在寫的時後還有另一個問題就是

1. MSD =MA(C,10) < MA(C,30)

複製代碼

這時後 If(MSD) 確會是錯的... MA(C,10) < MA(C,30) 不是 bool 還真不習慣~~

enochyu

altubers 發表於 13-7-30 22:00
目前測試是拿ma 和mv來計算…arrow到是隨著點到的k bar而改變

在寫的時後還有另一個問題就是

可以用下列寫法改看看

1. _DirectionR = ( Close > Open );
   
2. _DirectionG = NOT( _DirectionR );
   
3. _ArrowPosY = IIf( _DirectionR , Low, High );
   
4. _ArrowColor = IIf( _DirectionR , colorRed, colorGreen );
   
5. 
   
6. PlotShapes( shapeUpArrow * _DirectionR + shapeDownArrow * _DirectionG
   
7.     , _ArrowColor
   
8.     , 0
   
9.     , _ArrowPosY
   
10.     , -20
    
11. );

複製代碼

moneymaker

MAD =  MA(C,10) - MA(C,30);
VAD =  MA(V,10) - MA(V,30);
  Direction = IIf ( (MAD>0 AND VAD>0) OR ( MAD<0 AND VAD<0), 1, -1 );
  PlotShapes ( IIf(  Direction>0 AND C>O, shapeUpArrow, shapeDownArrow), IIf( Direction>0 AND C>O , colorRed, colorGreen),0, IIf(  Direction>0 AND C>O,  Low-12,High+12));

u04122

感謝各位大大的啟發與技巧分享.