Unit error "Hz"

Unit error "Hz" - Unit error "Hz" - Messages

#1 Posted: 2/2/2017 12:16:04 AM
Jean Giraud

Jean Giraud

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"Hz", the SI unit of frequency equates ONE cycle per second.
In my times, ONE cycle was ONE complete revolution.
So, ω:{2*π*'rad}/{8.6*10^4*'s}=7.306*10^{-5}*'Hz incorrect.

Bug 6179 Hz NOT radps.sm (6 KiB) downloaded 44 time(s).
#2 Posted: 2/2/2017 5:19:35 AM
Davide Carpi

Davide Carpi

1416 likes in 2873 posts.

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#3 Posted: 2/2/2017 11:04:41 AM
Jean Giraud

Jean Giraud

983 likes in 6866 posts.

Group: User

Thanks Davide for re-threading to the original from "Javier"
There are rights and wrongs in the Smath unit system.
For sure Smath is wrong saying "1 rad/s = 1 Hz"
1 rad/s = 1/2pi Hz
rad/s is a measure,,, Hz is a count.

Jean
#4 Posted: 2/2/2017 12:34:14 PM
Jean Giraud

Jean Giraud

983 likes in 6866 posts.

Group: User

...no more argument about this bug

Unit rads.bmp
#5 Posted: 2/2/2017 12:54:55 PM
Martin Kraska

Martin Kraska

1222 likes in 2150 posts.

Group: Moderator

As stated in [SS-2395], there are just two things that SMath is to blame for at the moment:

- the default unit for dimension 1/time is Hz. This should be 1/s instead. Then the interpretation of what the 1 in the numerator counts (revolutions or radians), is left to the user.
- the angular velocity units are listed in the category "frequency". Should be "angular velocity" of course.

When these things are fixed, SMath won't contribute to the confusion any more. Which doesn't mean that there won't be confusion...

Martin Kraska Pre-configured portable distribution of SMath Studio: https://en.smath.info/wiki/SMath%20with%20Plugins.ashx
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