GCC Code Coverage Report


Directory: src/
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Functions: 76.9% 10 / 0 / 13
Branches: 48.7% 200 / 0 / 411

bspline/m_bspline_quadrature.f90
Line Branch Exec Source
1 !> The B-spline quadrature module
2 !>
3 !> This module provides functionality for numerical integration (i.e., quadrature rules) over B-spline spaces.
4 module m_bspline_quadrature
5 use m_common, only: wp
6 use m_bspline_basis, only: BSplineSpace
7 use m_quadrature, only: MAX_QUADRATURE_NODES
8
9 implicit none
10
11 !> The default number of extra quadrature points to use for B-spline quadrature
12 integer, parameter :: DEFAULT_EXTRA_QUADRATURE_POINTS = 2
13
14 private
15
16 public :: DEFAULT_EXTRA_QUADRATURE_POINTS
17 public :: BSplineQuadrature, quadrature, quadrature_product, evaluate, n_quad_exact
18
19 !> @brief A type to hold the B-spline values at quadrature nodes
20 !>
21 !> This type merely wraps an array such that we can have an array of arrays
22 type QuadArray
23 real(wp) :: data(MAX_QUADRATURE_NODES)
24 end type QuadArray
25
26 !> @brief A type to hold the B-spline quadrature data: the values of all of the B-splines at the quadrature nodes
27 type BSplineQuadrature
28 !> The number of quadrature nodes
29 integer :: n_quad
30
31 !> The B-spline space for which the quadrature is defined
32 type(BSplineSpace) :: bspline
33
34 !> The quadrature weights (scaled by the interval length 'h')
35 real(wp), allocatable :: weights(:)
36
37 !> The quadrature nodes (on the interval (-1, 1))
38 real(wp), allocatable :: nodes(:)
39
40 !> The B-spline values at the quadrature nodes
41 type(QuadArray), allocatable :: bspline_at_nodes(:, :) ! j, j-1
42 contains
43 procedure :: destroy => destroy_bspline_quadrature
44 ! final :: destroy_bspline_quadrature_final
45 procedure, private, pass(to) :: copy => copy_bspline_quadrature
46 generic, public :: assignment(=) => copy
47 end type BSplineQuadrature
48
49 !> @brief Create a B-spline quadrature object
50 interface BSplineQuadrature
51 module procedure init_bspline_quadrature
52 end interface BSplineQuadrature
53
54 !> @brief Quadrature rules on a B-spline space
55 interface quadrature
56 procedure quadrature_1d, quadrature_1d_interval
57 end interface quadrature
58
59 !> @brief Quadrature rules on a product of two B-spline spaces
60 interface quadrature_product
61 procedure quadrature_product_1d, quadrature_product_1d_interval
62 end interface quadrature_product
63
64 !> @brief Determine the number of quadrature points needed for exact integration of a (product of) B-spline space(s)
65 interface n_quad_exact
66 procedure n_quad_exact_single, n_quad_exact_double
67 end interface n_quad_exact
68 contains
69
70 !> @brief Initialize a B-spline quadrature object ! TODO use TBP init
71 !>
72 !> @param[in] bspline The B-spline space for which the quadrature is defined
73 !> @param[in] n_quad _(optional)_ The number of quadrature points to use (default is the number needed for exact integration of
74 !> the product of the B-spline space with itself)
75 !>
76 !> @return The B-spline quadrature object
77 47766 function init_bspline_quadrature(bspline, n_quad) result(bspline_quadrature)
78 use m_bspline_functions, only: bspline_eval
79 use m_quadrature_data
80
81 type(BSplineSpace), intent(in) :: bspline
82 integer, optional, intent(in) :: n_quad
83
84 type(BSplineQuadrature) :: bspline_quadrature
85
86 integer :: j, j_minus_i, ndx, j0, j1, n_quad_
87 real(wp) :: x
88
89
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47766 if (present(n_quad)) then
90 47766 n_quad_ = n_quad
91 else
92 ! By default we ensure that we can integrate products of the B-spline space exactly
93 n_quad_ = n_quad_exact_double(bspline, bspline)
94 end if
95 47766 n_quad_ = max(n_quad_, 1) ! Support 2D problems having degree = -1 in one direction
96
97 47766 bspline_quadrature%bspline = bspline
98 bspline_quadrature%n_quad = n_quad_
99
100 if (allocated(bspline_quadrature%weights)) deallocate (bspline_quadrature%weights)
101
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143298 allocate (bspline_quadrature%weights(n_quad_))
102 if (allocated(bspline_quadrature%nodes)) deallocate (bspline_quadrature%nodes)
103
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95532 allocate (bspline_quadrature%nodes(n_quad_))
104
105 4122 select case (n_quad_)
106 case (1)
107
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12366 bspline_quadrature%weights = gl_weights_1 * bspline%h / 2
108
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12366 bspline_quadrature%nodes = gl_nodes_1
109 case (2)
110
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10524 bspline_quadrature%weights = gl_weights_2 * bspline%h / 2
111
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10524 bspline_quadrature%nodes = gl_nodes_2
112 case (3)
113
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31425 bspline_quadrature%weights = gl_weights_3 * bspline%h / 2
114
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31425 bspline_quadrature%nodes = gl_nodes_3
115 case (4)
116
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43086 bspline_quadrature%weights = gl_weights_4 * bspline%h / 2
117
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43086 bspline_quadrature%nodes = gl_nodes_4
118 case (5)
119
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96509 bspline_quadrature%weights = gl_weights_5 * bspline%h / 2
120
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96509 bspline_quadrature%nodes = gl_nodes_5
121 case (6)
122
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39696 bspline_quadrature%weights = gl_weights_6 * bspline%h / 2
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39696 bspline_quadrature%nodes = gl_nodes_6
124 case (7)
125
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37494 bspline_quadrature%weights = gl_weights_7 * bspline%h / 2
126
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37494 bspline_quadrature%nodes = gl_nodes_7
127 case (8)
128
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25010 bspline_quadrature%weights = gl_weights_8 * bspline%h / 2
129
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25010 bspline_quadrature%nodes = gl_nodes_8
130 case (9)
131
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20284 bspline_quadrature%weights = gl_weights_9 * bspline%h / 2
132
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20284 bspline_quadrature%nodes = gl_nodes_9
133 case (10)
134
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2436 bspline_quadrature%weights = gl_weights_10 * bspline%h / 2
135
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2436 bspline_quadrature%nodes = gl_nodes_10
136 case (11)
137
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1092 bspline_quadrature%weights = gl_weights_11 * bspline%h / 2
138
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1092 bspline_quadrature%nodes = gl_nodes_11
139 case (12)
140 bspline_quadrature%weights = gl_weights_12 * bspline%h / 2
141 bspline_quadrature%nodes = gl_nodes_12
142 case (13)
143 bspline_quadrature%weights = gl_weights_13 * bspline%h / 2
144 bspline_quadrature%nodes = gl_nodes_13
145 case (14)
146 bspline_quadrature%weights = gl_weights_14 * bspline%h / 2
147 bspline_quadrature%nodes = gl_nodes_14
148 case (15)
149 bspline_quadrature%weights = gl_weights_15 * bspline%h / 2
150 bspline_quadrature%nodes = gl_nodes_15
151 case (16)
152 bspline_quadrature%weights = gl_weights_16 * bspline%h / 2
153 bspline_quadrature%nodes = gl_nodes_16
154 case default
155
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47766 error stop "Number of quadrature points not supported"
156 end select
157
158 ! allocate(bspline_quadrature%bspline_at_nodes(1:n_quad_, 1:bspline%degree+1, 0:bspline%degree))
159 if (allocated(bspline_quadrature%bspline_at_nodes)) deallocate (bspline_quadrature%bspline_at_nodes)
160
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191064 allocate (bspline_quadrature%bspline_at_nodes(0:bspline%degree, 0:bspline%degree))
161
162
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47766 if (bspline%is_periodic) then
163 ! All of the B-splines are the same, and 1 + degree is the first one without any boundary involvement
164 j0 = bspline%degree
165 j1 = bspline%degree
166 else
167 ! The first degree B-splines have some boundary involvement (as do the final degree B-splines)
168 ! and the 1 + degree B-spline is the first one without any boundary involvement
169 ! and thus represents all the 'interior' B-splines
170 j0 = 0
171 j1 = bspline%degree
172 end if
173
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175265 do j = j0, j1
174
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859821 do j_minus_i = 0, bspline%degree
175
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5354149 do ndx = 1, n_quad_
176 4542094 x = (1 + bspline_quadrature%nodes(ndx)) / 2
177 bspline_quadrature%bspline_at_nodes(j, j_minus_i)%data(ndx) = bspline_eval(x, j, j_minus_i, bspline%degree, &
178 4542094 & bspline%is_scaled)
179
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5226650 if (bspline%is_scaled) then
180 bspline_quadrature%bspline_at_nodes(j, j_minus_i)%data(ndx) = &
181 479634 & bspline_quadrature%bspline_at_nodes(j, j_minus_i)%data(ndx) * bspline%nr_intervals
182 end if
183 end do
184 end do
185 end do
186
187 47766 end function init_bspline_quadrature
188
189 !> @brief Destroy a B-spline quadrature object
190 !>
191 !> @param[inout] this The B-spline quadrature object to destroy
192 20472 subroutine destroy_bspline_quadrature(this)
193 implicit none
194
195 class(BSplineQuadrature), intent(inout) :: this
196
197
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20472 if (allocated(this%weights)) deallocate (this%weights)
198
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20472 if (allocated(this%nodes)) deallocate (this%nodes)
199
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20472 if (allocated(this%bspline_at_nodes)) deallocate (this%bspline_at_nodes)
200 20472 end subroutine destroy_bspline_quadrature
201
202 ! TODO the 'final' functionality is not reliably supported by all (any?) compilers, so we do not use it here
203
204 ! !> @brief Destroy a B-spline quadrature object when it goes out of scope (final)
205 ! !>
206 ! !> @param[inout] this The B-spline quadrature object to destroy
207 ! subroutine destroy_bspline_quadrature_final(this)
208 ! implicit none
209
210 ! type(BSplineQuadrature), intent(inout) :: this
211
212 ! call this%destroy()
213 ! end subroutine destroy_bspline_quadrature_final
214
215 !> @brief Copy a B-spline quadrature object
216 !>
217 !> @param[out] to The B-spline quadrature object to copy to
218 !> @param[in] from The B-spline quadrature object to copy
219
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47766 subroutine copy_bspline_quadrature(to, from)
220 implicit none
221
222 class(BSplineQuadrature), intent(out) :: to
223 class(BSplineQuadrature), intent(in) :: from
224
225 integer :: j, j_minus_i, j0, j1
226
227 47766 to%bspline = from%bspline
228 47766 to%n_quad = from%n_quad
229
230
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47766 if (allocated(to%weights)) deallocate (to%weights)
231
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143298 allocate (to%weights(from%n_quad))
232
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319922 to%weights = from%weights
233
234
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47766 if (allocated(to%nodes)) deallocate (to%nodes)
235
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143298 allocate (to%nodes(from%n_quad))
236
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319922 to%nodes = from%nodes
237
238
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47766 if (allocated(to%bspline_at_nodes)) deallocate (to%bspline_at_nodes)
239
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191064 allocate (to%bspline_at_nodes(0:from%bspline%degree, 0:from%bspline%degree))
240
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47766 if (from%bspline%is_periodic) then
242 ! All of the B-splines are the same, and 1 + degree is the first one without any boundary involvement
243 j0 = from%bspline%degree
244 j1 = from%bspline%degree
245 else
246 ! The first degree B-splines have some boundary involvement (as do the final degree B-splines)
247 ! and the 1 + degree B-spline is the first one without any boundary involvement
248 ! and thus represents all the 'interior' B-splines
249 j0 = 0
250 j1 = from%bspline%degree
251 end if
252
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175265 do j = j0, j1
253
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859821 do j_minus_i = 0, from%bspline%degree
254
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5354149 to%bspline_at_nodes(j, j_minus_i)%data(1:from%n_quad) = from%bspline_at_nodes(j, j_minus_i)%data(1:from%n_quad)
255 end do
256 end do
257
258 47766 end subroutine copy_bspline_quadrature
259
260 !> @brief Determine the number of quadrature points needed for exact integration of a single B-spline space
261 !>
262 !> @param[in] bspline The B-spline space for which the quadrature is defined
263 !>
264 !> @return The number of quadrature points needed for exact integration
265 pure integer function n_quad_exact_single(bspline) result(ans)
266 implicit none
267
268 type(BSplineSpace), intent(in) :: bspline
269
270 ans = 1 + int(bspline%degree / 2)
271 end function n_quad_exact_single
272
273 !> @brief Determine the number of quadrature points needed for exact integration of a product of two B-spline spaces
274 !>
275 !> @param[in] bspline1 The first B-spline space for which the quadrature is defined
276 !> @param[in] bspline2 The second B-spline space for which the quadrature is defined
277 !>
278 !> @return The number of quadrature points needed for exact integration
279 34733 pure integer function n_quad_exact_double(bspline1, bspline2) result(ans)
280 implicit none
281
282 type(BSplineSpace), intent(in) :: bspline1, bspline2
283
284 ans = 1 + max(bspline1%degree, bspline2%degree)
285 34733 end function n_quad_exact_double
286
287 !> @brief Evaluate the B-spline at a quadrature node
288 !>
289 !> @param[in] this The B-spline quadrature object
290 !> @param[in] j The index of the B-spline
291 !> @param[in] j_minus_i The index of the B-spline minus the index of the interval
292 !> @param[in] ndx The index of the quadrature node
293 !>
294 !> @return The value of the B-spline at the quadrature node
295 2377898566 pure real(wp) function evaluate(this, j, j_minus_i, ndx) result(ans)
296 use m_bspline_basis, only: get_j_internal
297 implicit none
298
299 type(BSplineQuadrature), intent(in) :: this
300 integer, intent(in) :: j, j_minus_i, ndx
301
302 integer :: j_internal, ndx_actual, j_internal_minus_i
303 logical :: bspline_mirrored
304
305 2377898566 call get_j_internal(this%bspline, j, j_internal, bspline_mirrored)
306
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2377898566 if (bspline_mirrored) then
307 728907062 ndx_actual = this%n_quad - ndx + 1
308 728907062 j_internal_minus_i = this%bspline%degree - j_minus_i
309 else
310 1648991504 ndx_actual = ndx
311 1648991504 j_internal_minus_i = j_minus_i
312 end if
313
314 2377898566 ans = this%bspline_at_nodes(j_internal, j_internal_minus_i)%data(ndx_actual)
315 2377898566 end function evaluate
316
317 !> @brief Quadrature over a B-spline
318 !>
319 !> @param[in] this The B-spline quadrature object
320 !> @param[in] j The index of the B-spline
321 !> @param[in] userfun _(optional)_ A user-defined function to be multiplied with the B-spline
322 !>
323 !> @return The result of the quadrature rule
324 158130 pure real(wp) function quadrature_1d(this, j, userfun) result(ans)
325 use m_bspline_basis, only: get_index_ranges
326 use m_common, only: user_function_1d_interface
327 use m_quadrature_data
328
329 type(BSplineQuadrature), intent(in) :: this
330 integer, intent(in) :: j
331 procedure(user_function_1d_interface), optional :: userfun
332
333 integer :: i, i0_min, i0_max, i1_min, i1_max
334
335 158130 call get_index_ranges(this%bspline, j, i0_min, i0_max, i1_min, i1_max)
336
337 ans = 0._wp
338
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339
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870072 if (present(userfun)) then
340 377316 ans = ans + quadrature_1d_interval(this, j, i, userfun)
341 else
342 334626 ans = ans + quadrature_1d_interval(this, j, i)
343 end if
344 end do
345
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346
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260424 if (present(userfun)) then
347 52692 ans = ans + quadrature_1d_interval(this, j, i, userfun)
348 else
349 49602 ans = ans + quadrature_1d_interval(this, j, i)
350 end if
351 end do
352
353 158130 end function quadrature_1d
354
355 !> @brief Quadrature over a B-spline on a single interval
356 !>
357 !> @param[in] this The B-spline quadrature object
358 !> @param[in] j The index of the B-spline
359 !> @param[in] i The index of the interval
360 !> @param[in] userfun _(optional)_ A user-defined function to be multiplied with the B-spline
361 !>
362 !> @return The result of the quadrature rule on the interval
363 1037334 pure real(wp) function quadrature_1d_interval(this, j, i, userfun) result(ans)
364 use m_bspline_basis, only: get_j_minus_i_quad
365 use m_common, only: user_function_1d_interface
366
367 implicit none
368
369 type(BSplineQuadrature), intent(in) :: this
370 integer, intent(in) :: j, i
371 procedure(user_function_1d_interface), optional :: userfun
372
373 integer :: j_minus_i, ndx
374 real(wp) :: val, x
375
376 1037334 j_minus_i = get_j_minus_i_quad(this%bspline, j, i)
377
378 ans = 0._wp
379
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1037334 if (0 <= j_minus_i .and. j_minus_i <= this%bspline%degree) then
380
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381 3401236 val = evaluate(this, j, j_minus_i, ndx)
382
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3401236 if (present(userfun)) then
383 1857114 x = (i + .5_wp + this%nodes(ndx) / 2) * this%bspline%h
384 1857114 val = val * userfun(x)
385 end if
386 4225180 ans = ans + val * this%weights(ndx)
387 end do
388 end if
389
390 1037334 end function quadrature_1d_interval
391
392 !> @brief Quadrature over a product of two B-splines
393 !>
394 !> @param[in] this1 The first B-spline quadrature object
395 !> @param[in] this2 The second B-spline quadrature object
396 !> @param[in] j1 The index of the first B-spline
397 !> @param[in] j2 The index of the second B-spline
398 !> @param[in] userfun _(optional)_ A user-defined function to be multiplied with the product of the B-splines
399 !>
400 !> @return The result of the quadrature rule on the product of the B-splines
401 4136838 pure real(wp) function quadrature_product_1d(this1, this2, j1, j2, userfun) result(ans)
402 use m_bspline_basis, only: get_index_ranges
403 use m_common, only: user_function_1d_interface
404 use m_quadrature_data
405
406 type(BSplineQuadrature), intent(in) :: this1, this2
407 integer, intent(in) :: j1, j2
408 procedure(user_function_1d_interface), optional :: userfun
409
410 integer :: i, i0_min, i0_max, i1_min, i1_max
411
412 4136838 call get_index_ranges(this1%bspline, this2%bspline, j1, j2, i0_min, i0_max, i1_min, i1_max)
413
414 ans = 0._wp
415
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416
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9753192 if (present(userfun)) then
417 2736264 ans = ans + quadrature_product_1d_interval(this1, this2, j1, j2, i, userfun)
418 else
419 2880090 ans = ans + quadrature_product_1d_interval(this1, this2, j1, j2, i)
420 end if
421 end do
422
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423
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4136838 if (present(userfun)) then
424 ans = ans + quadrature_product_1d_interval(this1, this2, j1, j2, i, userfun)
425 else
426 ans = ans + quadrature_product_1d_interval(this1, this2, j1, j2, i)
427 end if
428 end do
429
430 4136838 end function quadrature_product_1d
431
432 !> @brief Quadrature over a product of two B-splines on a single interval
433 !>
434 !> @param[in] this1 The first B-spline quadrature object
435 !> @param[in] this2 The second B-spline quadrature object
436 !> @param[in] j1 The index of the first B-spline
437 !> @param[in] j2 The index of the second B-spline
438 !> @param[in] i The index of the interval
439 !> @param[in] userfun _(optional)_ A user-defined function to be multiplied with the product of the B-splines
440 !>
441 !> @return The result of the quadrature rule on the product of the B-splines on the interval
442 5616354 pure real(wp) function quadrature_product_1d_interval(this1, this2, j1, j2, i, userfun) result(ans)
443 use m_bspline_basis, only: get_j_minus_i_quad
444 use m_common, only: user_function_1d_interface
445
446 implicit none
447
448 type(BSplineQuadrature), intent(in) :: this1, this2
449 integer, intent(in) :: j1, j2, i
450 procedure(user_function_1d_interface), optional :: userfun
451
452 integer :: j1_minus_i, j2_minus_i, ndx
453 real(wp) :: val, x
454
455 5616354 j1_minus_i = get_j_minus_i_quad(this1%bspline, j1, i)
456 5616354 j2_minus_i = get_j_minus_i_quad(this2%bspline, j2, i)
457
458 ans = 0._wp
459 if (0 <= j1_minus_i .and. j1_minus_i <= this1%bspline%degree .and. &
460
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5616354 0 <= j2_minus_i .and. j2_minus_i <= this2%bspline%degree) then
461
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33002016 do ndx = 1, this1%n_quad
462 27385662 val = evaluate(this1, j1, j1_minus_i, ndx) * evaluate(this2, j2, j2_minus_i, ndx)
463
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27385662 if (present(userfun)) then
464 13184604 x = (i - .5_wp + this1%nodes(ndx) / 2) * this1%bspline%h
465 13184604 val = val * userfun(x)
466 end if
467 33002016 ans = ans + val * this1%weights(ndx)
468 end do
469 end if
470
471 5616354 end function quadrature_product_1d_interval
472
473
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__m_bspline_quadrature_MOD___copy_m_bspline_quadrature_Bsplinequadrature:
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__m_bspline_quadrature_MOD___final_m_bspline_quadrature_Bsplinequadrature:
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143298 end module m_bspline_quadrature
474