Packages

mmath

0.2.4
0.2.26 0.2.25 0.2.24 0.2.23 0.2.22 0.2.21 0.2.20 0.2.19 0.2.18 0.2.17 0.2.16 0.2.15 0.2.14 0.2.13 0.2.12 0.2.11 0.2.10 0.2.9 0.2.8 0.2.7 0.2.6 0.2.5 0.2.4 0.2.3 0.2.2 0.2.1 0.2.0 0.2.0-alpha9 0.2.0-alpha8 0.2.0-alpha7 0.2.0-alpha6 0.2.0-alpha5 0.2.0-alpha4 0.2.0-alpha3 0.2.0-alpha2 0.2.0-alpha10 0.2.0-alpha1 0.2.0-alpha 0.1.17-alpha 0.1.16 0.1.15 0.1.14 0.1.13 0.1.11 0.1.10 0.1.9 0.1.8 0.1.7 0.1.6

math library for metric sequences and binary arrays.

Current section

Files

Jump to
Readme
49 Versions
0 Dependencies
Dependants
Files
Activity
mmath src mmath_trans.erl
Raw

src/mmath_trans.erl 

%%%-------------------------------------------------------------------

%%% @author Heinz Nikolaus Gies <heinz@licenser.net>

%%% @copyright (C) 2014, Heinz Nikolaus Gies

%%% @doc

%%% Functions that transform metric.

%%% @end

%%% Created :  8 Jun 2014 by Heinz Nikolaus Gies <heinz@licenser.net>

%%%-------------------------------------------------------------------

-module(mmath_trans).



-export([

         derivate/1,

         confidence/1,

         mul/2,

         divide/2]).



-include("mmath.hrl").



-define(APPNAME, mmath).

-define(LIBNAME, trans_nif).

-on_load(load_nif/0).

load_nif() ->

    SoName = case code:priv_dir(?APPNAME) of

                 {error, bad_name} ->

                     case filelib:is_dir(filename:join(["..", priv])) of

                         true ->

                             filename:join(["..", priv, ?LIBNAME]);

                         _ ->

                             filename:join([priv, ?LIBNAME])

                     end;

                 Dir ->

                     filename:join(Dir, ?LIBNAME)

             end,

    erlang:load_nif(SoName, 0).



%%--------------------------------------------------------------------

%% @doc

%% Multiplies each value in the binary with the provided integer.

%% @end

%%--------------------------------------------------------------------

-spec mul(binary(), pos_integer()) -> binary().

mul(_M, _D) ->

    erlang:nif_error(nif_library_not_loaded).



%%--------------------------------------------------------------------

%% @doc

%% Divides each value in the binary with the provided integer.

%% @end

%%--------------------------------------------------------------------

-spec divide(binary(), pos_integer()) -> binary().

divide(_M, _D) ->

    erlang:nif_error(nif_library_not_loaded).



%%--------------------------------------------------------------------

%% @doc

%% Calculates the derivate of the values, this means the first value

%% is dropped (or taken as the initial value) with each following

%% value being calculated by derivate(n) = value(n) - value(n-1).

%%

%% The resulting binary will be one ellement shorter!

%% @end

%%--------------------------------------------------------------------

-spec derivate(binary()) -> binary().

derivate(_) ->

    erlang:nif_error(nif_library_not_loaded).



%%--------------------------------------------------------------------

%% @doc

%% Transforms the series into the confidence score for each value.

%% Unset values have a confidence of 0% while set values have a

%% confidence of 100%. Aggregated values have the aggreated confidence

%% score.

%% @end

%%--------------------------------------------------------------------

-spec confidence(binary()) -> binary().

confidence(_) ->

    erlang:nif_error(nif_library_not_loaded).