Secondary Structure Utilities

Functions to create, parse, convert, manipulate, and compare secondary structure representations.

Specialized Modules:

Functions

int *vrna_loopidx_from_ptable(const short *pt)
#include <ViennaRNA/structures/dotbracket.h>

Get a loop index representation of a structure.

char *vrna_db_from_probs(const FLT_OR_DBL *pr, unsigned int length)
#include <ViennaRNA/structures/dotbracket.h>

Create a dot-bracket like structure string from base pair probability matrix.

SWIG Wrapper Notes:

This function is available as parameter-less method db_from_probs() bound to objects of type fold_compound. Parameters pr and length are implicitely taken from the fold_compound object the method is bound to. Upon missing base pair probabilities, this method returns an empty string. See, e.g. RNA.db_from_probs() in the Python API.

char *vrna_pairing_tendency(vrna_fold_compound_t *fc)
#include <ViennaRNA/structures/dotbracket.h>
char vrna_bpp_symbol(const float *x)
#include <ViennaRNA/structures/dotbracket.h>

Get a pseudo dot bracket notation for a given probability information.

char *vrna_db_from_bps(vrna_bps_t bp_stack, unsigned int length)
#include <ViennaRNA/structures/dotbracket.h>

Create a dot-backet/parenthesis structure from backtracking stack.

This function is capable to create dot-bracket structures from base pairs stored within the base pair stack bp_stack.

Parameters:

  • bp_stack – Base pair stack containing the traced base pairs

  • length – The length of the structure

Returns:

The secondary structure in dot-bracket notation as provided in the input

char *vrna_db_from_bp_stack(vrna_bp_stack_t *bp, unsigned int length)
#include <ViennaRNA/structures/dotbracket.h>

Create a dot-backet/parenthesis structure from backtracking stack.

This function is capable to create dot-bracket structures from suboptimal structure prediction sensu M. Zuker

Parameters:

  • bp – Base pair stack containing the traced base pairs

  • length – The length of the structure

Returns:

The secondary structure in dot-bracket notation as provided in the input

void vrna_letter_structure(char *structure, vrna_bp_stack_t *bp, unsigned int length)
#include <ViennaRNA/structures/dotbracket.h>
unsigned int *vrna_refBPcnt_matrix(const short *reference_pt, unsigned int turn)
#include <ViennaRNA/structures/utils.h>

Make a reference base pair count matrix.

Get an upper triangular matrix containing the number of basepairs of a reference structure for each interval [i,j] with i<j. Access it via iindx!!!

unsigned int *vrna_refBPdist_matrix(const short *pt1, const short *pt2, unsigned int turn)
#include <ViennaRNA/structures/utils.h>

Make a reference base pair distance matrix.

Get an upper triangular matrix containing the base pair distance of two reference structures for each interval [i,j] with i<j. Access it via iindx!!!