From: Andy Shevchenko <andriy.shevchenko@intel.com>
To: David Lechner <dlechner@baylibre.com>
Cc: "Francesco Lavra" <flavra@baylibre.com>,
"Jonathan Cameron" <jic23@kernel.org>,
"Nuno Sá" <nuno.sa@analog.com>,
"Andy Shevchenko" <andy@kernel.org>,
linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v7 5/6] iio: ABI: Add partial quaternion modifier
Date: Thu, 5 Mar 2026 09:04:40 +0200 [thread overview]
Message-ID: <aakrCIJBdHb1T30Y@ashevche-desk.local> (raw)
In-Reply-To: <77e10517-2b6e-417b-95d3-185d3a067ba5@baylibre.com>
On Wed, Mar 04, 2026 at 04:35:39PM -0600, David Lechner wrote:
> On 3/4/26 2:07 AM, Francesco Lavra wrote:
...
> > + - the quaternion vector is normalized, i.e. x^2 + y^2 + z^2 + w^2 = 1
>
> Isn't this usually written with w first?
>
> > + - the rotation angle is within the [-180, 180] range, i.e. the w
>
> Best to say the angle units. IIO standard unit for angle is radians.
>
> > + component (which represents the amount of rotation) is non-negative
Based on these, maybe the name should be
normalised_360_quaternion
(or variations of this)? Actually "partial" quaternion some articles use
for something different as far as I can say.
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2026-03-05 7:04 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-04 8:05 [PATCH v7 0/6] imu: st_lsm6dsx: Add support for rotation sensor Francesco Lavra
2026-03-04 8:06 ` [PATCH v7 1/6] iio: imu: st_lsm6dsx: Fix check for invalid samples from FIFO Francesco Lavra
2026-03-07 12:46 ` Jonathan Cameron
2026-03-07 15:23 ` Lorenzo Bianconi
2026-03-07 17:04 ` Jonathan Cameron
2026-03-07 17:20 ` Lorenzo Bianconi
2026-03-04 8:06 ` [PATCH v7 2/6] iio: Replace 'sign' field with union in struct iio_scan_type Francesco Lavra
2026-03-04 22:55 ` David Lechner
2026-03-07 12:47 ` Jonathan Cameron
2026-03-07 13:10 ` Jonathan Cameron
2026-03-04 8:06 ` [PATCH v7 3/6] iio: tools: Add support for floating-point numbers in buffer scan elements Francesco Lavra
2026-03-04 22:53 ` David Lechner
2026-03-04 8:06 ` [PATCH v7 4/6] iio: ABI: " Francesco Lavra
2026-03-04 22:45 ` David Lechner
2026-03-05 9:09 ` Francesco Lavra
2026-03-05 9:23 ` Andy Shevchenko
2026-03-05 14:37 ` David Lechner
2026-03-06 12:09 ` Andy Shevchenko
2026-03-07 12:51 ` Jonathan Cameron
2026-03-17 10:40 ` Francesco Lavra
2026-03-04 8:07 ` [PATCH v7 5/6] iio: ABI: Add partial quaternion modifier Francesco Lavra
2026-03-04 11:51 ` Andy Shevchenko
2026-03-04 14:21 ` Francesco Lavra
2026-03-04 22:42 ` David Lechner
2026-03-05 8:50 ` Francesco Lavra
2026-03-05 14:40 ` David Lechner
2026-03-06 12:10 ` Andy Shevchenko
2026-03-04 19:25 ` kernel test robot
2026-03-04 22:35 ` David Lechner
2026-03-05 7:04 ` Andy Shevchenko [this message]
2026-03-07 13:00 ` Jonathan Cameron
2026-03-07 13:03 ` Jonathan Cameron
2026-03-08 20:27 ` Andy Shevchenko
2026-03-14 11:14 ` Jonathan Cameron
2026-03-07 13:05 ` Jonathan Cameron
2026-03-04 8:07 ` [PATCH v7 6/6] iio: imu: st_lsm6dsx: Add support for rotation sensor Francesco Lavra
2026-03-04 13:39 ` Andy Shevchenko
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