Is it too complex or impossible to add a symbol (for example ~) in console 
numbers to advise when they are rounded in display, but not in calculation?
1.000~   for    0.999999999999999999




----- Original Message ----- 
From: "Andrea Strappa" 
To: 
Sent: Monday, December 24, 2018 4:21 PM
Subject: Re: [Csnd] table opcodes


> thank you. I will try to keep this last sentence in mind.
>
>
> ----- Original Message ----- 
> From: "John ff" 
> To: 
> Sent: Monday, December 24, 2018 1:18 PM
> Subject: Re: [Csnd] table opcodes
>
>
> =frac(ipch)*100 is only an integer if ipch has no part in the thousandths. 
> Rounding errors are all too easy to get.
>
> ⁣Sent from TypeApp
>
> On Dec 24, 2018, 11:02, at 11:02, Andrea Strappa  wrote:
>>yet from this formula:
>>itabndx =frac(ipch)*100
>>whole numbers should come out...
>>
>>----- Original Message ----- 
>>From: "Andrea Strappa" 
>>To: 
>>Sent: Monday, December 24, 2018 11:48 AM
>>Subject: Re: [Csnd] table opcodes
>>
>>
>>yes, in my gen02 example
>>itabndx =frac(ipch)*100
>>don't work, it give unexpected results, but
>>itabndx = round(frac(ipch)*100)
>>work well.
>>Maybe it is enough to add a note in the manual.
>>
>>----- Original Message ----- 
>>From: "Victor Lazzarini" 
>>To: 
>>Sent: Sunday, December 23, 2018 9:36 PM
>>Subject: Re: [Csnd] table opcodes
>>
>>
>>But that's surely user error, is it not? If floor is not wanted, then
>>interpolation is what is
>>needed. Truncating table lookup uses floor not round.
>>
>>Victor Lazzarini
>>Dean of Arts, Celtic Studies, and Philosophy
>>Maynooth University
>>Ireland
>>
>>> On 23 Dec 2018, at 20:20, jpff  wrote:
>>>
>>> The trouble with floor is rounding error as in the original message
>>of
>>> this thread.
>>>
>>> At least we should correct the manual and give a warning.
>>>
>>>> On Sun, 23 Dec 2018, Victor Lazzarini wrote:
>>>>
>>>> yes, I rewrote these for 6 to remove the need for power of two. I
>>think
>>>> floor is the correct operation; in any case, if we change it, we
>>will
>>>> change behaviour.
>>>>
>>>> Victor Lazzarini
>>>> Dean of Arts, Celtic Studies, and Philosophy
>>>> Maynooth University
>>>> Ireland
>>>>
>>>>> On 23 Dec 2018, at 20:11, John  wrote:
>>>>>
>>>>> More code study shows that if we have a power-of-two table it uses
>>the
>>>>> fact, but if not resorts to more expensive ways.  So despite the
>>>>> manual the opcodes are save for any table.  What they do is use
>>floor
>>>>> operation on the index so small rounding error as in the example in
>>>>> question give unexpected results.
>>>>>
>>>
>>> Csound mailing list
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It is always rounded to the number of decimal places used.  It would be 
hard to indicate when to trigger the alternate format.  So I suspect it is 
not really feasible.  Anyone have any (other) thoughts?

On Mon, 24 Dec 2018, Andrea Strappa wrote:

> Is it too complex or impossible to add a symbol (for example ~) in console 
> numbers to advise when they are rounded in display, but not in calculation?
> 1.000~   for    0.999999999999999999
>
>
>
>

Csound mailing list
Csound@listserv.heanet.ie
https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
Send bugs reports to
        https://github.com/csound/csound/issues
Discussions of bugs and features can be posted here