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| author | tlatorre <tlatorre@uchicago.edu> | 2018-08-27 10:12:17 -0500 |
|---|---|---|
| committer | tlatorre <tlatorre@uchicago.edu> | 2018-08-27 10:12:17 -0500 |
| commit | 779266ec72a5c76ee52043ab3ae17479ba6a9788 (patch) | |
| tree | 9a03c335731aeff2cadb728bc3fe4309aafef874 /src/random.h | |
| parent | 4e3eb54e364f578b3ea6608b0b3fc34125985ab8 (diff) | |
| download | sddm-779266ec72a5c76ee52043ab3ae17479ba6a9788.tar.gz sddm-779266ec72a5c76ee52043ab3ae17479ba6a9788.tar.bz2 sddm-779266ec72a5c76ee52043ab3ae17479ba6a9788.zip | |
add code to expand the track of a particle using a KL expansion
To fit the path of muons and electrons I use the Karhunen-Loeve expansion of a
random 2D walk in the polar angle in x and y. This allows you to decompose the
path into a sum over sine functions whose coefficients become random variables.
The nice thing about fitting the path in this way is that you can capture
*most* of the variation in the path using a small number of variables by only
summing over the first N terms in the expansion and it is easy to calculate the
probability of the coefficients since they are all uncorrelated.
Diffstat (limited to 'src/random.h')
| -rw-r--r-- | src/random.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/random.h b/src/random.h index 309cd71..733279c 100644 --- a/src/random.h +++ b/src/random.h @@ -4,5 +4,6 @@ #include "mt19937ar.h" double randn(void); +void rand_sphere(double *dir); #endif |