renormalizer
joined 4 months ago
I've been a four-star programmer a few times. Imagine a blocked symmetric matrix where the rows and columns are indexed by triples (u,v,w). The entries are zero whenever u != u' or v != v', and because of symmetry you only store entries with w <= w'. But the range of v depends on the value of u and the range of w on the value of v. So you do
double ****mat = calloc (UMAX, sizeof(*mat));
for (int u = 0; u < UMAX; ++u) {
mat[u] = calloc (u + 1, sizeof(**mat));
for (int v = 0; v <= u; ++v) {
mat[u][v] = calloc (v + 1, sizeof(***mat));
for (int w = 0; w <= v; ++w) {
mat[u][v][w] = calloc (w + 1, sizeof(****mat));
for (int ww = 0; ww <= w; ++ww)
mat[u][v][w][ww] = some_function (u, v, w, ww);
}
}
}
and weep a little. In reality, this gets a bit optimized by allocating a single chunk of memory and carving that up into the pointer and data arrays, so everything is reasonably close together in memory.
Sieht eher wie Lemguine aus. Ist die Wissenschaft zu weit gegangen?
Eine Kunst, bitte!
Yes, for the (anti-)electrons. Antiprotons and neutrons should be able to annihilate as well, and vice versa. They are composite particles made of (anti) up and down quarks, so processes like antiproton (anti u anti u anti d) + neutron (udd) -> photons + pi- (anti u d) ( + pi0 maybe) could happen. The pions are short-lived particles called mesons, made of a quark and an antiquark.
I doubt their soul would be willing to be revived just to be tortured and killed again.
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