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// count the sequences in a fasta file
int count_sequences(char *filename);

// normalize a matrix by dividing each element by the sum of it's column
void normalize_matrix(double *matrix, int height, int width);

// load a sensing matrix
double *load_sensing_matrix(char *filename, int height, int width);

// load a count matrix
double *load_count_matrix(char *filename, int width, int kmer);

// load headers
char **load_headers(char *filename, int sequences);