# bdm::MemDS Class Reference

Memory storage of off-line data column-wise. More...

## Detailed Description

Memory storage of off-line data column-wise.

The data are stored in an internal matrix `Data` . Each column of Data corresponds to one discrete time observation . Access to this matrix is via indices `rowid`.

The data can be loaded from a file.

`#include <datasources.h>`

List of all members.

## Public Member Functions
int | max_length ()
| Returns maximum number of provided data, by default it is set to maximum allowed length, shorter DS should overload this method! See, MemDS.max_length().
void | getdata (vec &dt)
| Returns full vector of observed data=[output, input].
void | getdata (vec &dt, const ivec &indeces)
| Returns data records at indeces.
void | set_drv (const RV &drv, const RV &urv)
| set random variables
void | write (const vec &ut)
| Accepts action variable and schedule it for application.
void | write (const vec &ut, const ivec &indices)
| Accepts action variables at specific indeces.
void | step ()
| Moves from to , i.e. perfroms the actions and reads response of the system.
| MemDS ()
| Default constructor.
| MemDS (mat &Dat, ivec &rowid0)
| Convenience constructor.
void | from_setting (const Setting &set)
virtual void | log_add (logger &L)
| Register DS for logging into logger L.
virtual void | logit (logger &L)
| Register DS for logging into logger L.
virtual const RV & | _drv () const
| access function
const RV & | _urv () const
| access function
const RV & | _yrv () const
| access function
virtual string | to_string ()
| This method returns a basic info about the current instance.
virtual void | to_setting (Setting &set) const
| This method save all the instance properties into the Setting structure.
virtual void | validate ()
| This method TODO.
## Protected Attributes
mat | Data
| internal matrix of data
int | time
| active column in the Data matrix
ivec | rowid
| vector of rows that are presented in Dt
int | dtsize
| size of data returned by `getdata()`
int | utsize
| size of data
int | ytsize
| size of output
RV | Drv
| Description of data returned by `getdata()`.
RV | Urv
| Description of data witten by by `write()`.
RV | Yrv
| Description of output data.
ivec | LIDs
| Remember its own index in Logger L, [0=dt, 1=ut].

## Member Function Documentation

void bdm::MemDS::from_setting | ( | const Setting & | set | ) | `[inline, virtual]`

Create object from the following structure

                    { class = "MemDS";
                       Data = (...);            // Data matrix or data vector
                       --- optional ---
                       drv = {class="RV"; ...} // Identification how rows of the matrix Data will be known to others
                       time = 0;               // Index of the first column to user_info,
                       rowid = [1,2,3...];     // ids of rows to be used
                    }

If the optional fields are not given, they will be filled as follows:

                    rowid= [0, 1, 2, ...number_of_rows_of_Data];
                    drv = {names=("ch0", "ch1", "ch2", ..."number_of_rows_of_Data");
                          sizes=( 1    1    1 ...);
                              times=( 0    0    0 ...);
                              };
                    time = 0;

If `rowid` is given, `drv` will be named after indeces in rowids.

Hence the data provided by method `getdata()` will be full column of matrix Data starting from the first record.

Reimplemented from bdm::root.

Reimplemented in bdm::ITppFileDS, and bdm::mxArrayDS.

References Data, bdm::DS::dtsize, bdm::UI::get(), rowid, set_drv(), time, and bdm::DS::utsize.

The documentation for this class was generated from the following files:

- datasources.h
- datasources.cpp