# GSoC Final Report

This report summarizes the work done in my GSoC 2020 project, Implementation of Vector Integration with SymPy. Blog posts with step by step development of the project are available at friyaz.github.io.

I am Faisal Riyaz and I have completed my third year of B.Tech in Computer Engineering student from Aligarh Muslim University.

## Overview

The goal of the project is to add functions and class structure to support the integration of scalar and vector fields over curves, surfaces, and volumes. My mentors were Francesco Bonazzi (Primary) and Divyanshu Thakur.

## Work Completed

Here is a list of PRs which were opened during the span of GSoC:

• (Merged) #19472: Adds `ParametricRegion` class to represent parametrically defined regions.

• (Merged) #19539: Adds `ParametricIntegral` class to represent integral of scalar or vector field over a parametrically defined region.

• (Merged) #19580: Modified API of `ParametricRegion`.

• (Merged) #19650: Added support to integrate over objects of geometry module.

• (Merged) #19681: Added `ImplicitRegion` class to represent implicitly defined regions.

• (Megred) #19807: Implemented the algorithm for rational parametrization of conics.

• (Merged) #20000: Added API of newly added classes to sympy’s documentation.

• (Open) #19883: Allow `vector_integrate` to handle `ImplicitRegion` objects.

• (Open) #20021: Add usage examples.

We had an important discussion regarding our initial approach and possible problems on issue #19320

### Defining Regions with their parametric equations

The `ParametricRegion` class is used to represent a parametric region in space.

``````>>> from sympy.vector import CoordSys3D, ParametricRegion, vector_integrate
>>> from sympy.abc import r, theta, phi, t, x, y, z
>>> from sympy import pi, sin, cos, Eq

>>> C = CoordSys3D('C')

>>> circle = ParametricRegion((4*cos(theta), 4*sin(theta)), (theta, 0, 2*pi))
>>> disc = ParametricRegion((r*cos(theta), r*sin(theta)), (r, 0, 4), (theta, 0, 2*pi))
>>> box = ParametricRegion((x, y, z), (x, 0, 1), (y, -1, 1), (z, 0, 2))
>>> cone = ParametricRegion((r*cos(theta), r*sin(theta), r), (theta, 0, 2*pi), (r, 0, 3))

>>> vector_integrate(1, circle)
8*pi
>>> vector_integrate(C.x*C.x - 8*C.y*C.x, disc)
64*pi
>>> vector_integrate(C.i + C.j, box)
(Integral(1, (x, 0, 1), (y, -1, 1), (z, 0, 2)))*C.i + (Integral(1, (x, 0, 1), (y, -1, 1), (z, 0, 2)))*C.j
>>> _.doit()
4*C.i + 4*C.j
>>> vector_integrate(C.x*C.i - C.z*C.j, cone)
-9*pi
``````

### Integration over objects of `geometry` module

Many regions like circle are commonly encountered in problems of vector calculus. the geometry module of SymPy already had classes for some of these regions. The function`parametric_region_list` was added to determine the parametric representation of such classes. `vector_integrate` can directly integrate objects of Point, Curve, Ellipse, Segment and Polygon class of `geometry` module.

``````>>> from sympy.geometry import Point, Segment, Polygon, Segment
>>> s = Segment(Point(4, -1, 9), Point(1, 5, 7))
>>> triangle = Polygon((0, 0), (1, 0), (1, 1))
>>> circle2 = Circle(Point(-2, 3), 6)
>>> vector_integrate(-6, s)
-42
>>> vector_integrate(C.x*C.y, circle2)
-72*pi
>>> vector_integrate(C.y*C.z*C.i + C.x*C.x*C.k, triangle)
-C.z/2
``````

### Implictly defined Regions

In many cases, it is difficult to determine the parametric representation of a region. Instead, the region is defined using its implicit equation. To represent implicitly defined regions, we implemented the `ImplicitRegion` class.

But to integrate over a region, we need to determine its parametric representation. the `rationl_parametrization` method was added to `ImplicitRegion`.

``````>>> from sympy.vector import ImplicitRegion
>>> circle3 = ImplicitRegion((x, y), (x-4)**2 + (y+3)**2 - 16)
>>> parabola = ImplicitRegion((x, y), (y - 1)**2 - 4*(x + 6))
>>> ellipse = ImplicitRegion((x, y), (x**2/4 + y**2/16 - 1))
>>> rect_hyperbola = ImplicitRegion((x, y), x*y - 1)
>>> sphere = ImplicitRegion((x, y, z), Eq(x**2 + y**2 + z**2, 2*x))

>>> circle3.rational_parametrization()
(8*t/(t**2 + 1) + 4, 8*t**2/(t**2 + 1) - 7)
>>> parabola.rational_parametrization()
(-6 + 4/t**2, 1 + 4/t)
>>> rect_hyperbola.rational_parametrization(t)
(-1 + (t + 1)/t, t)
>>> ellipse.rational_parametrization()
(t/(2*(t**2/16 + 1/4)), t**2/(2*(t**2/16 + 1/4)) - 4)
>>> sphere.rational_parametrization()
(2/(s**2 + t**2 + 1), 2*s/(s**2 + t**2 + 1), 2*t/(s**2 + t**2 + 1))
``````

After PR #19883 gets merged, `vector_integrate` can directly work upon `ImplicitRegion` objects.

## Future Work

• In vector calculus, many regions cannot be defined using a single implicit equation. Instead, inequality or a combination of the implicit equation and conditional equations is required. For Example, a disc can only be represented using an inequality `ImplicitRegion(x**2 + y**2 < 9)` and a semicircle can be represented as `ImplicitRegion(x**2 + y**2 -4) & (y < 0))`. Support for such implicit regions needs to be added.

• The parametrization obtained using the `rational_parametrization` method in most cases is a large expression. SymPy’s `Integral` is unable to work over such expressions. It takes too long and often does not returns a result. We need to either simplify the parametric equations obtained or fix Integral to handle them.

• Adding the support to plot objects of `ParamRegion` and `ImplicitRegion`

## Conclusion

This summer has been a great learning experience. Writing a functionality, testing, debugging it has given me good experience in test-driven development. I think I realized many of the goals that I described in my proposal, though there were some major differences in the plan and actual implementation. Personally, I hoped I could have done better. I could not work much on the project during the last phase due to the start of the academic year.

I would like to thank Francesco for his valuable suggestions and being readily available for discussions. He was always very friendly and helpful. I would love to work more with him. S.Y Lee also provided useful suggestions.

Special thanks to Johann Mitteramskogler, Professor Sonia Perez Diaz, and Professor Sonia L.Rueda. They personally helped me in finding the algorithm for determining the rational parametrization of conics.

SymPy is an amazing project with a great community. I would mostly stick around after the GSoC period as well and continue contributing to SymPy, hopefully, exploring the other modules as well.

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Studying abroad is a complex and expensive business: the cost of a year can vary from hundreds of thousands to one and a half million rubles per year. However, there are many grants and scholarships available, some of them covering up to 100% of the tuition costs. You can learn about the subtleties of preparing a portfolio for admission and receiving scholarships at the exhibition of British education “Study UK: Discover You”. We advise you on which educational institutions you should pay attention to.

BIMM (British & Irish Modern Music Institute) The music industry in miniature .Britain’s most prestigious school of contemporary music. It teaches not only how to play a musical instrument well, but also how to interact with the industry. Among the directions — vocals, playing instruments, music business, production and songwriting (it is taught, for a moment, vocalist Lamb).

On the territory of the Institute there are several rehearsal bases and small studios: young musicians gather groups, record demos and organize concerts without leaving the walls of their native University, and student journalists publish LDN magazine, where they talk about their colleagues and interview masters from big show business. Senior colleagues (ranging from Chuck D to Brian may) also visit students, telling them about the intricacies of their work and leaving Souvenirs: in one of the halls, for example, you can admire an autographed Niall Rogers guitar. In General, there is a whole model of the music industry-and the model is quite working. As a result, bimm alumni include George Ezra, Tom Odell, Izzy Bizu, and the Cure drummer Jason Cooper. Royal Academy of Music. The oldest Conservatory in the United Kingdom, under the personal patronage of Her Majesty, will celebrate its bicentenary in 2022. The list of graduates and alumni is no less impressive: among others, Annie Lennox from Eurythmics and Elton John studied here (for authenticity, a couple of scenes of “Rocketman” were filmed in the Royal Academy

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