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Hello,
Discussed to death already. 0.2 does not have exact representation
in ANY binary computer.
http://en.wikipedia.org/wiki/IEEE_754
http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm
You should better use AlmostEqual function
http://www.amibroker.com/f?almostequal
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "si00si00" <si00si00@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Wednesday, May 07, 2008 5:12 PM
Subject: [amibroker] Re: Basic programming error
> Thanks for the answer Bill.
>
> PriceChange should return 0.02 actually quite often (about 12% of the
> time).
>
> I have just seen that when I imported my historical data into excel,
> the PriceChange value was giving me strange results, e.g.
> -0.010000000000005. Now in AFL, I rounded the PriceChange array to 3
> decimal places and it works.
>
> I don't think I'll ever figure out why the array was returning these
> strange values in both AFL and Excel. In my historical data all Close
> prices are give with two decimal places!
>
> Very strange (and very time consuming trying to figure out the error!)
>
> Thanks again.
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, "wavemechanic" <timesarrow@xxx> wrote:
>>
>> You will only get a response for pricechangetwo when pricechange is
> exactly equal to .02. How often does that happen? Maybe never. You
> can use a range of values such as pricechangetwo = pricechange >= .02.
>>
>> Bill
>> ----- Original Message -----
>> From: si00si00
>> To: amibroker@xxxxxxxxxxxxxxx
>> Sent: Wednesday, May 07, 2008 9:21 AM
>> Subject: [amibroker] Basic programming error
>>
>>
>> Hi all,
>>
>> I'm making some basic programming error that I can't figure out and
>> was wondering if someone could help me. The code is as follows:
>>
>> PriceChange = C - Ref(C,-1);
>> PriceChangeTwo = PriceChange == 0.02;
>>
>> When I plot PriceChange I get some values that are equal to 0.02.
>> However, the array PriceChangeTwo is always zero. Why is this?
>>
>> Thanks in advance for any help!
>>
>> Simon
>>
>>
>>
>>
>> ------------------------------------
>>
>> Please note that this group is for discussion between users only.
>>
>> To get support from AmiBroker please send an e-mail directly to
>> SUPPORT {at} amibroker.com
>>
>> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
>> http://www.amibroker.com/devlog/
>>
>> For other support material please check also:
>> http://www.amibroker.com/support.html
>> Yahoo! Groups Links
>>
>>
>>
>>
>>
>> --
>> No virus found in this incoming message.
>> Checked by AVG.
>> Version: 7.5.524 / Virus Database: 269.23.9/1418 - Release Date:
> 5/6/2008 5:17 PM
>>
>
>
>
> ------------------------------------
>
> Please note that this group is for discussion between users only.
>
> To get support from AmiBroker please send an e-mail directly to
> SUPPORT {at} amibroker.com
>
> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> http://www.amibroker.com/devlog/
>
> For other support material please check also:
> http://www.amibroker.com/support.html
> Yahoo! Groups Links
>
>
>
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