December 2018 - firedrake - imperial.ac.uk

Changes to our Terms of Service and Privacy Policy
by Google 15 Dec '18

15 Dec '18

Firedrake Project We’ll soon publish changes to our Terms of Service <https://policies.google.com/terms?hl=en-GB&gl=GB&utm_source=google&utm_medi…> that may affect the Google services that you use. Starting 22 January 2019, services offered under these terms will be offered by Google Ireland Limited instead of Google LLC. We’re making similar changes to the Drive <https://www.google.com/intl/en-GB_GB/drive/terms-of-service/>, Play <https://play.google.com/intl/en-GB_GB/about/play-terms.html>, YouTube <https://www.youtube.com/t/terms?preview=20190122> and YouTube Paid Service <https://www.youtube.com/t/terms_paidservice?preview=20190122> Terms of Service. You can find our new terms here <https://policies.google.com/terms/update?hl=en-GB&gl=GB&utm_source=google&u…> . At the same time, we’re also updating Google’s Privacy Policy <https://policies.google.com/privacy?hl=en-GB&gl=GB&utm_source=google&utm_me…> to specify that Google Ireland Limited will be the data controller responsible for your information and for complying with applicable privacy laws. These updates will take effect if you’re based in the European Union, Iceland, Liechtenstein, Norway or Switzerland (unless otherwise stated in a service-specific privacy notice). Our updated policy is here <https://policies.google.com/privacy/update?hl=en-GB&gl=GB&utm_source=google…> . Nothing about your experience in Google services will change. And nothing is changing in terms of your privacy settings, the way your data is processed, nor the purposes of its processing as described in the Google Privacy Policy. However, if you don’t want to accept these changes in our terms and Privacy Policy, you can choose to stop using the applicable services. If you use Family Link to manage a Google account for users below the age of consent, then please take some time to talk to them about these changes. You can see and manage your data in the Google Dashboard <https://account.google.com/dashboard>. And you can always change your privacy settings and data controls at any time in your Google account <https://account.google.com/>. This email was sent to firedrake(a)imperial.ac.uk to provide an update about your Google Account. © 2018 Google LLC, 1600 Amphitheatre Parkway, Mountain View, CA 94043, USA 1544857177593000

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Firedrake training 11 January 2019
by Ham, David A 12 Dec '18

12 Dec '18

Dear Firedrakers, Our regular January Firedrake training will be held on 11 January 1400-1900 at Imperial. This training targets new(ish) Firedrake users, but anyone is welcome to come. For more details and to register, please see the website: https://www.firedrakeproject.org/tutorial_jan_19.html Regards, David

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Help with installing firedrake
by Wingate, Beth 05 Dec '18

05 Dec '18

Hi everyone. I’m trying to install firedrake on my mac laptop. I don’t use macports. I’m using a bash shell. I’ve installed python with brew. I’m attaching my firedrake-install.log. Thanks advance! -Beth Beth Wingate b.wingate(a)exeter.ac.uk<mailto:b.wingate@exeter.ac.uk> The world is but a canvas to the imagination - Thoreau

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Changes to interpolation: this affects you!
by Ham, David A 05 Dec '18

05 Dec '18

Dear Firedrakers, This email is to let you know that one of the ways of creating expressions to interpolate into Functions is going to be deleted in January 2019. What is going away? --------------------------- Interpolating expressions given as C strings will no longer be possible. That is: f = interpolate(Expression("sin(x[0]*pi)"), V) will no longer work. Instead, you should interpolate a UFL expression. In the case above, this would be. x = SpatialCoordinate(V.mesh()) f = interpolate(sin(x[0] * math.pi), V) What do I need to do? ------------------------------ As of now, when you update Firedrake it will emit a warning every time you use a C string expression. You should change all of the C string expressions in your code to UFL expressions. See https://www.firedrakeproject.org/interpolation.html for documentation on interpolating UFL expressions. If you run into any difficulties, please ask via any of the usual support mechanisms: https://www.firedrakeproject.org/contact.html At a future date, currently expected to be in January 2019, we will remove support for C string expressions. Why are we doing this? ------------------------------- Firedrake is in the process of replacing its low-level loop manipulation framework and final code generation stage with Loopy https://mathema.tician.de/software/loopy/. Loopy enables sophisticated optimisations such as better vectorisation, and provides a pathway to GPU support. It also enables us to remove some quite old PyOP2 code which we now understand how to do better. Moving to Loopy means that the previous mechanism for injecting the C strings from expressions into generated code will not work, and any replacement would not be completely compatible with the current system. C string expressions are currently only supported for compatibility with FEniCS. It is always better to use UFL expressions, since they are more robust and produce much simpler to debug errors if used incorrectly. UFL expressions cover all the current functionality of C string expressions. Since UFL expressions are in every respect better than C string expressions, and since C string expressions are hard to make work with the new Loopy structure, we have decided to drop C string expression support.

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