Re^2: Engineering FP notation & sprintf

Hm. That's a different interpretation of "engineering notation". The basic requirement is that the characteristic (exponent) is always a power of 3. Eg. 6.66e+29 --> 6.660000e+29 should be 666.0e27.

Other examples:

1.23e2 -> 123 or (0.123e3).
123.4 -> as is ~~(or 12.34e3)~~ (Thanks, ambrus for pointing out the error!).
1234.56 -> 1.23456e3 (or as is).
1234567 -> 1.234567e6 (or 123.4567e3).

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

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In the absence of evidence, opinion is indistinguishable from prejudice.

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Re^3: Engineering FP notation & sprintf by toolic (Bishop) on Nov 16, 2009 at 21:40 UTC
For future reference... I finally found some time to package up the ideas in this thread and upload to CPAN `use warnings; use strict; use Number::FormatEng qw(format_eng); for my $num qw(1.23e2 1.234 1234.56 1234567 6.66e+29) { printf "%-10s -> %-10s\n", $num, format_eng($num); } __END__ 1.23e2 -> 123 1.234 -> 1.234 1234.56 -> 1.23456e3 1234567 -> 1.234567e6 6.66e+29 -> 666e27` [download] Comments and reviews are more than welcome.	[reply] [d/l]

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Re^3: Engineering FP notation & sprintf
by toolic (Bishop) on Nov 16, 2009 at 21:40 UTC

CPAN

use warnings;
use strict;
use Number::FormatEng qw(format_eng);

for my $num qw(1.23e2 1.234 1234.56 1234567 6.66e+29) {
    printf "%-10s -> %-10s\n", $num, format_eng($num);
}

__END__

1.23e2     -> 123
1.234      -> 1.234
1234.56    -> 1.23456e3
1234567    -> 1.234567e6
6.66e+29   -> 666e27
[download]

[reply]
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