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Object-oriented Scientific Computing Library: Version 0.910
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Miscellaneous functions. More...
#include <cstdlib>
#include <iostream>
#include <cmath>
#include <string>
#include <fstream>
#include <sstream>
#include <vector>
#include <gsl/gsl_vector.h>
#include <gsl/gsl_ieee_utils.h>
#include <o2scl/err_hnd.h>
#include <o2scl/lib_settings.h>
Go to the source code of this file.
Definition in file misc.h.
Data Structures | |
struct | string_comp |
Simple string comparison. More... | |
class | gen_test_number< tot > |
Generate number sequence for testing. More... | |
Functions | |
double | fermi_function (double E, double mu, double T, double limit=40.0) |
Calculate a Fermi-Dirac distribution function safely. | |
template<class string_arr_t > | |
int | screenify (size_t nin, const string_arr_t &in_cols, std::vector< std::string > &out_cols, size_t max_size=80) |
Reformat the columns for output of width size . | |
int | count_words (std::string str) |
Count the number of words in the string str . | |
int | remove_whitespace (std::string &s) |
Remove all whitespace from the string s . | |
std::string | binary_to_hex (std::string s) |
Take a string of binary quads and compress them to hexadecimal digits. | |
template<class type_t > | |
int | gsl_alloc_arrays (size_t nv, size_t msize, const char *names[], type_t *ptrs[], std::string func_name) |
A convenient function to allocate several arrays of the same size. | |
template<class type_t > | |
int | gsl_calloc_arrays (size_t nv, size_t msize, const char *names[], type_t *ptrs[], std::string func_name, type_t val) |
A convenient function to allocate and initialize several arrays of the same size. | |
int | gsl_calloc_gvecs (size_t nv, size_t msize, const char *names[], gsl_vector ***ptrs, std::string func_name) |
A convenient function to allocate and initialize several arrays of the same size. | |
double | quadratic_extremum_x (double x1, double x2, double x3, double y1, double y2, double y3) |
Return the x value of the extremum of a quadratic defined by three ![]() | |
double | quadratic_extremum_y (double x1, double x2, double x3, double y1, double y2, double y3) |
Return the y value of the extremum of a quadratic defined by three ![]() |
double fermi_function | ( | double | E, |
double | mu, | ||
double | T, | ||
double | limit = 40.0 |
||
) |
This calculates a Fermi-Dirac distribution function guaranteeing that numbers larger than and smaller than
will be avoided. The default value of
limit=40
ensures accuracy to within 1 part in compared to the maximum of the distribution (which is unity).
Note that this function may return Inf or NAN if limit
is too large, depending on the machine precision.
int screenify | ( | size_t | nin, |
const string_arr_t & | in_cols, | ||
std::vector< std::string > & | out_cols, | ||
size_t | max_size = 80 |
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) |
Given a string array in_cols
of size nin
, screenify() reformats the array into columns creating a new string array out_cols
.
For example, for an array of 10 strings
test1 test_of_string2 test_of_string3 test_of_string4 test5 test_of_string6 test_of_string7 test_of_string8 test_of_string9 test_of_string10
screenify() will create an array of 3 new strings:
test1 test_of_string4 test_of_string7 test_of_string10 test_of_string2 test5 test_of_string8 test_of_string3 test_of_string6 test_of_string9
If the value of max_size
is less than the length of the longest input string (plus one for a space character), then the output strings may have a larger length than max_size
.
int count_words | ( | std::string | str | ) |
Words are defined as groups of characters separated by whitespace, where whitespace is any combination of adjacent spaces, tabs, carriage returns, etc. On most systems, whitespace is usually defined as any character corresponding to the integers 9 (horizontal tab), 10 (line feed), 11 (vertical tab), 12 (form feed), 13 (carriage return), and 32 (space bar). The test program misc_ts
enumerates the characters between 0 and 255 (inclusive) that count as whitespace for this purpose.
Note that this function is used in text_in_file::string_in to perform string input.
int remove_whitespace | ( | std::string & | s | ) |
This function removes all characters in s
which correspond to the integer values 9, 10, 11, 12, 13, or 32.
std::string binary_to_hex | ( | std::string | s | ) |
This function proceeds from left to right, ignoring parts of the string that do not consist of squences of four '1's or '0's.
int gsl_alloc_arrays | ( | size_t | nv, |
size_t | msize, | ||
const char * | names[], | ||
type_t * | ptrs[], | ||
std::string | func_name | ||
) |
Allocate memory for nv
vectors of size msize
with names specified in names
and function name func_name
to produce pointers in ptrs
. This function is unsed internally to allocate several vectors in succession, taking care to free memory and call the error handler when an allocation fails.
The caller must make sure that previously allocated memory will be freed and an error is thrown if this function returns a non-zero value.
This function is used, for example, in gsl_miser.
int gsl_calloc_arrays | ( | size_t | nv, |
size_t | msize, | ||
const char * | names[], | ||
type_t * | ptrs[], | ||
std::string | func_name, | ||
type_t | val | ||
) |
int gsl_calloc_gvecs | ( | size_t | nv, |
size_t | msize, | ||
const char * | names[], | ||
gsl_vector *** | ptrs, | ||
std::string | func_name | ||
) |
The caller must make sure that previously allocated memory will be freed and an error is thrown if this function returns a non-zero value.
double quadratic_extremum_x | ( | double | x1, |
double | x2, | ||
double | x3, | ||
double | y1, | ||
double | y2, | ||
double | y3 | ||
) |
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