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Function Round Question.

Hi, Expert:

When we use function round, we found a strange status:

= ROUND(26364461.43,0.1) = 26364461.4
= ROUND(26364461.44,0.1)

= 26364461.4

But when the number is 26364461.45 , the answer become 26364461.4, In my mind, it should be 26364461.5.

= ROUND(26364461.45,0.1)

= 26364461.4

When we use the follow number , 26364461.46, 26364461.47 the answer is correct "26364461.5"

= ROUND(26364461.46,0.1) = 26364461.5
= ROUND(26364461.47,0.1) = 26364461.5

so, is ROUND(26364461.45,0.1) = 26364461.4 correct ?

I'm using Qlikview x64 11.20.SR9 Desktop.

Many thnaks

 

    Kent

:

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13 Replies
Not applicable

Re: Function Round Question.

round( x [ , base [ , offset ]])

Rounding of x upwards or downwards to the nearest multiple of base with an offset of offset. The result is a number. If x is exactly in the middle of an interval, it is rounded upwards.

Examples:

round( 2.4 ) returns 2

round( 2.6 ) returns 3

round( 2.5 ) returns 3

round( 3.88 , 0.1 ) returns 3.9

round( 3.88 , 5 ) returns 5

round( 1.1 , 1 , 0.5 ) returns 1.5

it may help u

Partner
Partner

Re: Function Round Question.

Hi , Manojqlik:

I know the syntax,

but the Function ROUND(26364461.45,0.1) ,  if follow the rule, the answer should be 26364461.5, not 26364461.4, Am I right ?

Thanks for your reply.

   Kent

Not applicable

Re: Function Round Question.

s your right the answer is 26364461.5 only

Partner
Partner

Re: Function Round Question.

Hi, Manojqlik:

so, the founction ROUND(26364461.45,0.1) the return value is wrong (26364461.4), thus, is it the bug or just I miss something ?

Not applicable

Re: Function Round Question.

= ROUND(26364461.46,0.1)        change here   .45  to .46

u will get  like 26364461.5       ,

small fractions caculation    ,

may be its a bug

Employee
Employee

Re: Function Round Question.

You are right Kent ... there have been inconsistencies reported before.  Its inconsistent with the documentation and buggy.

num() rounds differently to round() for half-step values

chinnakatikisg
Valued Contributor

Re: Function Round Question.

Hi Jonathan,

Unable to access the link you have provided to read about the inconsistencies for Round.

Best Regards,

Chinna

Partner
Partner

Re: Function Round Question.

Hi Manojqlik:

Yes, change the .45 to .46 can fix the problem, but it raise another question, these value is in the 10 million records, if I add this "if-then" condition, the performance should be not good. thus, have any good idea ?

Best Regards...

  Kent Liao

Not applicable

Re: Function Round Question.

No idea  yar, its a bug.

jonthan provided a  link based on this

i am able to see that link

http://community.qlik.com/message/423596#423596