Re: Yosemite decimal number conversion error
Re: Yosemite decimal number conversion error
- Subject: Re: Yosemite decimal number conversion error
- From: Takaaki Naganoya <email@hidden>
- Date: Wed, 29 Oct 2014 13:22:11 +0900
> 2014/10/29 12:44、Shane Stanley <email@hidden> のメール：
> On 29 Oct 2014, at 1:40 pm, Takaaki Naganoya <email@hidden> wrote:
>>
>> I found an error with decimal number conversion from AppleScript's ‘real' into Cocoa's ‘float'.
>> Is it well-known?
>
> I'm not sure that it's strictly an error, but the problem seems to be that the return value has a different precision. Storing floating-point values in binary form nearly always involves some rounding.
>
> If you need exact matching values, you could try this:
>
> on numberFloatWith:aNum
> set theNum to current application's NSNumber's numberWithFloat:aNum
> return (theNum's descriptionWithLocale:(current application's NSLocale's systemLocale())) as real
> end numberFloatWith:
>
> But that's going to be messy with lists.
>
> I guess the question is: Where and how does it really matter?
Thank you, Shane!
It is unthinkable way for me…. Like a magic.
I really stack with sorting number list with ASOC.
It was an easy task. But it brought me a heavy headache.
<AppleScript>
use AppleScript version "2.4"
use framework "Foundation"
use scripting additions
set aList to {1, 1, 10, 0.1, 1.1, -1, -100} --Original List
set aRes to sort1DNumList_ascOrder_(aList, true)
--> {-100, -1, 0.10000000149, 1, 1.100000023842, 10}--Result (!!!!)
--Sort 1-Dimension List（Number List）
on sort1DNumList:theList ascOrder:aBool
tell current application's NSSet to set theSet to setWithArray_(theList)
tell current application's NSSortDescriptor to set theDescriptor to sortDescriptorWithKey_ascending_(missing value, true)
set sortedList to theSet's sortedArrayUsingDescriptors:{theDescriptor}
return (sortedList) as list
end sort1DNumList:ascOrder:
</AppleScript>
--
Takaaki Naganoya
email@hidden
http://piyocast.com/as/
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