* Rounding off real (floating point) values - bash to awk
@ 2015-11-26 13:30 Lester Anderson
2015-11-26 15:32 ` Eliot Moss
` (2 more replies)
0 siblings, 3 replies; 7+ messages in thread
From: Lester Anderson @ 2015-11-26 13:30 UTC (permalink / raw)
To: cygwin
Hello,
I can use a script like:
#!/bin/bash
x=3.7
# pass variable x to awk via -v (var=value)
awk -v x=$x 'BEGIN { printf "%3.0f\n", x }'
#
which returns the value 4 as expected, but are there any other methods
that can be used?
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* Re: Rounding off real (floating point) values - bash to awk
2015-11-26 13:30 Rounding off real (floating point) values - bash to awk Lester Anderson
@ 2015-11-26 15:32 ` Eliot Moss
2015-12-03 9:14 ` Duncan Roe
2015-11-26 16:33 ` Steven Penny
2015-11-26 18:04 ` Achim Gratz
2 siblings, 1 reply; 7+ messages in thread
From: Eliot Moss @ 2015-11-26 15:32 UTC (permalink / raw)
To: cygwin
On 11/26/2015 8:24 AM, Lester Anderson wrote:
> Hello,
>
> I can use a script like:
>
> #!/bin/bash
> x=3.7
> # pass variable x to awk via -v (var=value)
> awk -v x=$x 'BEGIN { printf "%3.0f\n", x }'
> #
>
> which returns the value 4 as expected, but are there any other methods
> that can be used?
In bash this must be a string (bash uses only fixed width integers for numbers),
so you can put as many decimal places as you like. awk will treat it as a string
or floating point number, depending on context. The f output format forces conversion.
Another way is to do arithmetic; even x+0 will do it. IIRC, all numbers in awk are
doubles (IEEE 64-bit floats). The documentation on awk can tell you more about
conversions, rounding, etc.
Regards -- Eliot Moss
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* Re: Rounding off real (floating point) values - bash to awk
2015-11-26 15:32 ` Eliot Moss
@ 2015-12-03 9:14 ` Duncan Roe
0 siblings, 0 replies; 7+ messages in thread
From: Duncan Roe @ 2015-12-03 9:14 UTC (permalink / raw)
To: cygwin
On Thu, Nov 26, 2015 at 09:18:52AM -0500, Eliot Moss wrote:
> On 11/26/2015 8:24 AM, Lester Anderson wrote:
> >Hello,
> >
> >I can use a script like:
> >
> >#!/bin/bash
> >x=3.7
> ># pass variable x to awk via -v (var=value)
> >awk -v x=$x 'BEGIN { printf "%3.0f\n", x }'
> >#
> >
> >which returns the value 4 as expected, but are there any other methods
> >that can be used?
>
> In bash this must be a string (bash uses only fixed width integers for numbers),
> so you can put as many decimal places as you like. awk will treat it as a string
> or floating point number, depending on context. The f output format forces conversion.
> Another way is to do arithmetic; even x+0 will do it. IIRC, all numbers in awk are
> doubles (IEEE 64-bit floats). The documentation on awk can tell you more about
> conversions, rounding, etc.
>
> Regards -- Eliot Moss
>
You can skip using awk: under bash 'printf "%3.0f\n" 3.7' gives " 4".
Or 'printf "%.0f\n" 3.7' gives 4,
Cheers ... Duncan.
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Rounding off real (floating point) values - bash to awk
2015-11-26 13:30 Rounding off real (floating point) values - bash to awk Lester Anderson
2015-11-26 15:32 ` Eliot Moss
@ 2015-11-26 16:33 ` Steven Penny
2015-11-26 17:20 ` Steven Penny
2015-11-26 18:04 ` Achim Gratz
2 siblings, 1 reply; 7+ messages in thread
From: Steven Penny @ 2015-11-26 16:33 UTC (permalink / raw)
To: cygwin
On Thu, Nov 26, 2015 at 7:24 AM, Lester Anderson wrote:
> x=3.7
> awk -v x=$x 'BEGIN { printf "%3.0f\n", x }'
> which returns the value 4 as expected, but are there any other methods
> that can be used?
echo 3.7 | awk '{printf "%.0f", $0}'
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Rounding off real (floating point) values - bash to awk
2015-11-26 13:30 Rounding off real (floating point) values - bash to awk Lester Anderson
2015-11-26 15:32 ` Eliot Moss
2015-11-26 16:33 ` Steven Penny
@ 2015-11-26 18:04 ` Achim Gratz
2 siblings, 0 replies; 7+ messages in thread
From: Achim Gratz @ 2015-11-26 18:04 UTC (permalink / raw)
To: cygwin
Lester Anderson writes:
[…]
By now, none of what you ask has anything to do with Cygwin anymore.
Please consider chosing a more appropriate forum for your questions.
Regards,
Achim.
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end of thread, other threads:[~2015-12-03 9:14 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
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2015-11-26 13:30 Rounding off real (floating point) values - bash to awk Lester Anderson
2015-11-26 15:32 ` Eliot Moss
2015-12-03 9:14 ` Duncan Roe
2015-11-26 16:33 ` Steven Penny
2015-11-26 17:20 ` Steven Penny
2015-11-26 17:27 ` Helmut Karlowski
2015-11-26 18:04 ` Achim Gratz
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