Reference Manual of the nadc-tools API and Libraries - SRON

2.24 NADC FILESIZE
Identifier NADC FILESIZE
Author R.M. van Hees
Language ANSI C
Purpose obtain files size from operating system
Usage flsize = NADC FILESIZE( flname );
Input char *flname : name of the file
Returns size of file in bytes
Comment None
2.25 NADC FIT
Identifier NADC FIT
Author R.M. van Hees
Language ANSI C
Purpose fitting data to a straight line y = a + b * x
Usage NADC FIT( dim arr, x arr, y arr, err arr,
&fit a, &fit b, &sig a, &sig b, &chi2 fit, &q fit );
Input size t dim arr : number of data points
float *x arr : independent variable values (X-axis)
float *y arr : dependent variable values (Y-axis)
float *err arr : measurement errors of the data points Y
Output float *fit a : parameter a
float *fit b : parameter b,
if NULL then a horizontal line is fitted
float *sig a : uncertainty in parameter a
float *sig b : uncertainty in parameter b,
not calculated in case fit b == NULL
float *chi2 fit : chi-square of fit
float *q fit : goodness-of-fit probability
(NULL will skip the calculation)
Returns nothing
Comment adopted from Numerical Recipes in C
43