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some work; does not work

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This commit is contained in:
Daniel Knüttel 2019-07-15 16:56:16 +02:00
parent d380860e78
commit 1a9ddddc6d
3 changed files with 15 additions and 18 deletions
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26
c/interaction/interaction.c
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@ -64,17 +64,13 @@ interaction_ufunc_float2D
char * x_old = args[0] char * x_old = args[0]
, * y_old = args[1] , * y_old = args[1]
, * p_x_old = args[2] , * p_x_new = args[2]
, * p_y_old = args[3] , * p_y_new = args[3];
, * p_x_new = args[4]
, * p_y_new = args[5];
npy_intp x_old_steps = steps[0] npy_intp x_old_steps = steps[0]
, y_old_steps = steps[1] , y_old_steps = steps[1]
, p_x_old_steps = steps[2] , p_x_new_steps = steps[2]
, p_y_old_steps = steps[3] , p_y_new_steps = steps[3];
, p_x_new_steps = steps[4]
, p_y_new_steps = steps[5];
float * coefficients = (float *) data; float * coefficients = (float *) data;
float dt = coefficients[19]; float dt = coefficients[19];
@ -102,10 +98,8 @@ interaction_ufunc_float2D
this_x_i = *(float *)(x_old + i*x_old_steps); this_x_i = *(float *)(x_old + i*x_old_steps);
this_y_i = *(float *)(y_old + i*y_old_steps); this_y_i = *(float *)(y_old + i*y_old_steps);
// copy current momenta *(float *)(p_x_new + i*p_x_new_steps) = 0;
*(float *)(p_x_new + i*p_x_new_steps) = *(float *)(p_x_old + i*p_x_old_steps); *(float *)(p_y_new + i*p_y_new_steps) = 0;
*(float *)(p_y_new + i*p_y_new_steps) = *(float *)(p_y_old + i*p_y_old_steps);
// compute and add the momentum offset // compute and add the momentum offset
for(j = 0; j < i; j++) for(j = 0; j < i; j++)
{ {
@ -156,7 +150,7 @@ interaction_ufunc_float2D
//NPY_END_THREADS; //NPY_END_THREADS;
} }
static char interaction_types[] = static char interaction_types[] =
{ NPY_FLOAT, NPY_FLOAT, NPY_FLOAT, NPY_FLOAT, NPY_FLOAT, NPY_FLOAT}; { NPY_FLOAT, NPY_FLOAT, NPY_FLOAT, NPY_FLOAT};
static char force_types[] = static char force_types[] =
{ NPY_FLOAT, NPY_FLOAT}; { NPY_FLOAT, NPY_FLOAT};
static PyUFuncGenericFunction force_funcs[1] = static PyUFuncGenericFunction force_funcs[1] =
@ -245,9 +239,9 @@ interaction_UFuncWrapper_init
interaction_funcs interaction_funcs
, self->data , self->data
, interaction_types , interaction_types
, 1 , 1 // ntypes
, 4 , 2 // nin
, 2 , 2 // nout
, PyUFunc_None , PyUFunc_None
, "interaction2D" , "interaction2D"
, "Update the momenta according to the given coefficients and positions" , "Update the momenta according to the given coefficients and positions"

2
particles.py
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@ -16,7 +16,7 @@ borders_y = [-100, 100]
n_particles = 600 n_particles = 600
frames = 100 frames = 100
spawn_restriction = 1.1 spawn_restriction = 1.1
dt = 0.01 dt = 0.1
c[-1] = dt c[-1] = dt
x_coords = np.random.uniform(borders_x[0] / spawn_restriction, borders_x[1] / spawn_restriction, n_particles).astype(np.float16) x_coords = np.random.uniform(borders_x[0] / spawn_restriction, borders_x[1] / spawn_restriction, n_particles).astype(np.float16)

5
py/brown/brown.py
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@ -37,7 +37,10 @@ class BrownIterator(object):
if(self._i == 1): if(self._i == 1):
return self.x, self.y return self.x, self.y
self.px, self.py = self._interaction(self.x, self.y, self.px, self.py) delta_px, delta_py = self._interaction(self.x, self.y)
self.px += delta_px
self.py += delta_py
print(self.px)
# XXX: We need the (-1)**i to make the problem # XXX: We need the (-1)**i to make the problem
# symmetric. # symmetric.
self.px[np.isnan(self.px)] = self.speed_of_light * (-1)**self._i self.px[np.isnan(self.px)] = self.speed_of_light * (-1)**self._i