Backtests No Longer Work

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05/04/2026 at 7:50 PM #260806 quote

Bard
Participant

Master

Hi, its been some years since the auto systems I had running have been launched, but what I am finding is that once working systems are now producing no positions.
Can anyone figure out what I need to do to get them working? Here is one that isn’t running:

Cheers!

IndexBond-Std-Dev-Strategy.itf

05/05/2026 at 7:58 AM #260812 quote
GraHal
Participant

Master
I changed as below and the Algo you posted springs into life (from dead / no trades) and takes trades on US30 Index.
I then GRAPH sizebuy and it shows as 0?
```
BUY at Market //sizebuy SHARES AT MARKET
```
Nicolas and Iván González thanked this post
06/11/2026 at 1:40 PM #261879 quote
Bard
Participant

Master
Thanks @GraHal!
It’s odd because “sizebuy” was a legit parameter that triggered trades previously, but now it doesn’t? Does anyone know why?
```
sizebuy = ROUND((capital *perccap /100)/ margin)
```
Cheers
06/11/2026 at 4:04 PM #261880 quote
Nicolas
Keymaster

Legend
Because since 2 years or so, ROUND accept a second parameter to how many decimals you want to round. If there is none, then 0.2 is rounded to 0 and therefore no trade!
It works if you round your contract size to just 1 decimal:
```
sizebuy = round((capital *perccap /100)/ margin,1)
```
robertogozzi and GraHal thanked this post
06/12/2026 at 12:01 AM #261895 quote

PeterSt
Participant

Master

Backwards Compatibility.
A phenomenon unknown to PRT.

One of the worst exhibits of PRT.
Don’t ask me for examples, but I ran into many examples throughout time. It is incomprehensible that any software developer allows for this.

Something else : A Round command without parameters for the number of decimals to round down to, makes no sense to me in the first place. So if this really has been the case – so be it. But if so … come one. This can’t be serious …

06/12/2026 at 8:04 AM #261898 quote

Nicolas
Keymaster

Legend

FLOOR
FLOOR
and
CEIL
CEIL
instructions have been added at the same time.
For reference: https://www.prorealcode.com/documentation/round/
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