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/**
* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Generate Cephes test fixtures.
*
* ## Notes
*
* - Run this script from the directory in which fixtures should be written.
*
*/
#include <stdlib.h>
#include <stdio.h>
/**
* Define prototypes for external functions.
*/
extern double fresnl( double x, double *S, double *C );
/**
* Generates a random number on the interval [0,1].
*
* @return random number
*/
double rand_double() {
int r = rand();
return (double)r / ( (double)RAND_MAX + 1.0 );
}
/**
* Generates an array of pseudorandom doubles drawn from a uniform distribution.
*
* @param out output array
* @param len array length
* @param a lower bound (inclusive)
* @param b upper bound (exclusive)
*/
void rand_array_f64( double *out, const unsigned int len, const double a, const double b ) {
unsigned int i;
double delta;
delta = b - a;
for ( i = 0; i < len; i++ ) {
out[ i ] = a + ( rand_double()*delta );
}
}
/**
* Writes an array of doubles to a file as a series of comma-separated values.
*
* @param f file to write to
* @param x array of doubles
* @param len array length
*/
void write_array_f64( FILE *f, const double *x, const unsigned int len ) {
unsigned int i;
for ( i = 0; i < len; i++ ) {
fprintf( f, "%.17g", x[ i ] );
if ( i < len-1 ) {
fprintf( f, "," );
}
}
}
/**
* Writes a named array of doubles to a file as JSON.
*
* @param f file to write to
* @param name array name
* @param x data
* @param len array length
*/
void write_named_array_f64( FILE *f, const char *name, const double *x, const unsigned int len ) {
fprintf( f, "\"%s\":[", name );
write_array_f64( f, x, len );
fprintf( f, "]" );
}
/**
* Writes data to a file as JSON.
*
* @param f file to write to
* @param x domain
* @param C C(x)
* @param len array length
*/
void write_data_as_json( FILE *f, const double *x, const double *C, const unsigned int len ) {
fprintf( f, "{" );
write_named_array_f64( f, "x", x, len );
fprintf( f, "," );
write_named_array_f64( f, "C", C, len );
fprintf( f, "}" );
}
/**
* Generates test fixtures.
*
* @param x domain
* @param len number of values in the domain
* @param name output filename
*/
void generate( double *x, const unsigned int len, const char *name ) {
unsigned int i;
double *C;
double S;
FILE *f;
// Allocate an output array:
C = (double*) malloc( len * sizeof(double) );
if ( C == NULL ) {
printf( "Error allocating memory.\n" );
exit( 1 );
}
// Generate fixture data:
for ( i = 0; i < len; i++ ) {
fresnl( x[i], &S, C + i );
}
// Open a new file:
f = fopen( name, "w" );
if ( f == NULL ) {
printf( "Error opening file.\n" );
exit( 1 );
}
// Write data as JSON:
write_data_as_json( f, x, C, len );
// Close the file:
fclose( f );
// Free allocated memory:
free( C );
}
/**
* Main execution sequence.
*/
int main( void ) {
unsigned int len;
double *x;
// Define the array length:
len = 1000;
// Allocate an array:
x = (double*) malloc( len * sizeof(double) );
if ( x == NULL ) {
printf( "Error allocating memory.\n" );
exit( 1 );
}
// Generate fixture data:
rand_array_f64( x, len, 0.0, 10.0 );
generate( x, len, "small.json" );
rand_array_f64( x, len, 10.0, 100.0 );
generate( x, len, "medium.json" );
rand_array_f64( x, len, 100.0, 36973.0 );
generate( x, len, "medium.json" );
rand_array_f64( x, len, 40000.0, 60000.0 );
generate( x, len, "huge.json" );
// Free allocated memory:
free( x );
return 0;
}
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