Next bar, next bash

[Orphelin@xxxxxxx]

Dans un courrier daté du 12/11/98 09:09:03 Heure d9iver Pari3 Madrid, Brian
Massey écrit:

> 
>  In the code I posted yesterday concerning pivot points in OSC for tomorrow,
>  I left out a critical piece of info (adding c[1] to the part in
>  parentheses).
>  
>  Here's what it should be (see below to compare to last night's)
>  
>  Inputs : ePrice(NumericSeries);
>  Vars: iRawPrice(0);
>  
>  iRawPrice = 0;
>  iRawPrice = c[1] + (c[1] * RateOfChange(ePrice,2)[0] / 100) ;
>  
>  TS_STPivot = iRawPrice;
>  

Ah, this is interesting...

First, your solution, even fixed, is not good EL programming at all:
Assuming that the code was valid, it's CPU time wasting for a such a simple
code:
Knowing that ROC= 100(c/c[n] -1), your  above formula should write simpler:

	iRawPrice = c[1] + (c[1] * RateOfChange(ePrice,2)[0] / 100) ;
<==>	iRawPrice c[1] + (c[1] *( 100*(ePrice/ePrice[2]-1)*100;

Now, I assume that ePrice could nothing different than c, because you make use
 of c and c[1] in the above formula.
This will change nothing to the following remark.

<==> iRawPrice = c[1] + (c[1] *( 100*(c/c[2]-1)/100;
<==> iRawPrice = c[1] + (c[1] (c/c[2]-1);
<==> iRawPrice = c[1] + (c[1] (c/c[2]-1);
<==> iRawPrice = c[1] + c[1]*c/c[2]-c[1]);
<==> iRawPrice = c[1]*c/c[2];

The general formula will be: 
iRawPrice = c[length-1]*c/c[length];
Where length is the lookback period of the ROC.

Second, you do not need to write:
 iRawPrice = 0;
This is useless in this case.
You should know that EL carries previous values of variables 
from bar to bar when using a series function.
This will produce an annoying 0 plot when  curentbar<length, making the
indicator scale from 0 to price.
To avoid this , you need to write:
 iRawPrice = ePrice;

Third, you do not need to use a temporary variable like iRawprice.
Better to use the function name directly in this case:
TS_STPivot = c[1]*c/c[2];

Fourth, instead of using price as input ( that is not consistent
with the close values that you use in the next bar ROC formula,
better is to use lenght and price as inputs:

Your user function should write:

Inputs : ePrice(NumericSeries), length(numericsimple);
TS_STPivot=ePrice; ( avoids the zero plot during early bars).
TS_STPivot = ePrice[length-1]*ePrice/ePrice[length];

All of this spares the following operations:
1 multiplication
1 division
1 addition.
1 substraction
...and remove one variable from the code, and is of general use.

Thanks to give me the chance to give you some simple EL lessons.
Brillant people often need some when they go off road when avoiding cold
thinking.
I, of course, do not mean that you are not a good programmer. 
I only point out that when someone has a strong and definitive advice on
anything, he could
be more careful before sending 4 messages a day.

Your EL programmer friend  and sometimes useful Omega-List spammer,
-Pierre Orphelin

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