utils.h

/*
 * utils.h
 *
 *  Created on: Dec 3, 2010
 *      Author: bert
 *
 *      A bunch of helper functions used throughout b-matching library.
 */

#ifndef UTILS_H_
#define UTILS_H_

using namespace std;

namespace utils {

        // Takes a file and reads the input as a matrix of values
        void readDoubleMatrix(const char * filename, double **mat, int rows, int cols);
        void readIntMatrix(char * filename, int **mat, int rows, int cols);

        // Takes a file and reads the input as a full column of values
        void readDoubleArray(const char * filename, double *col, int size);
        void readIntArray(const char * filename, int *col, int size);

        // Prints a double matrix to std out
        void printDoubleMatrix(double** mat, int rows, int cols);

        // Prints an array to std out
        void printIntArray(int * A, int size);
        void printDoubleArray(double * A, int size);

        // allocate each row of an array of pointers
        void allocateDoubleRows(double **mat, int rows, int cols);
        void allocateIntRows(int **mat, int rows, int cols);

        // clears an array to all zeros
        void clearDoubleArray(double * A, int size);
        void clearIntArray(int * A, int size);

        // copies a double array into another
        void copyDoubleArray(double * A, double * B, int size);

        // Quicksorts a double array and an int array according to the double values
        void indexSort(double * X, int * inds, int N);

        // Quickselects a double array and int array according to the double values
        void indexSelect(double * X, int * inds, int N, int k);

        // Quicksorts an array of ints
        void sortInts(int * X, int N);

        // Creates an array of indicies
        int * indexArray(int size);

        // finds the index of the minimum value of an array of doubles
        int arrayMin(double * A, int size);

}

#endif /* UTILS_H_ */