mcpw 0.3.3

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McStas Python Wrapper (mcpw)

Update Notifications

0.2.2->0.3.0:

renamed function: post_mcrun_funktions() to post_simulation() introduced mandatory function pre_simulation()

added special function custom():

Requirements

A mcstas instrument with all components

The Define Section of your instrument must have following Format:

DEFINE INSTRUMENT 'instrument'
(
    double x = 1.0,     //comment

	//comment
    int i = 1,          //comment
    float f = 1.0,      //comment
)

empty lines will be ignored

In order to have proper MPI support this script depends on the Open MPI implemenation when using unix based systems. MPIexec will not work and leads to an error.

Short Overview

This Package offers several functions to improve your workflow with Mcstas Simuations and Processing the simmulation results.

The Functionality is build around the two Classes variables and mcvariables.

class variables

variables are global variables that apply to any simulation and contains the location of the main working directory. it is automatically generated with the 'mcpw_setup' command and is saved in local_var.python_requires

class mcvariables

mcvariables contains all important variables to run a simulation. the mcpw_setup command will create it from the given instrument file and put it into instrument_name.py file.

the instrument.py file

the instrument.py file will be the main file you will work in. appart from the mcvariables class it will contain all your custom functions for analysing and datatreatment. here you import all necessary packages and all your functions you want to get executed you add into the analyse() function or the post_mcrun_funktions() function. the analyse and post_mcrun_funktions will be called by mcpw_manager and executed

First Setup

Requirements:

the mcpw_setup command creates all necessary files in order to use the mcpw_manager command.

cd to the directory where your mcstas instrument lies

then execute mcpw_setup:

mcpw_setup -I instrument.instr -d working_directory -m path_to_mcstas_executable -o output_directory -c component_directory

necessary is only the -I instrument.intr argument.

with the -d working_directory argument you can set a different directory than your current one as the main working directory

with the -m argument you can give the location of your mcstas installation. only needed if you did not install mcstas with a packages manager

with the -o argument you can specify the location of the output directory where the simulation results are put in. the default is 'simulation_results' in the main working directory

with the -c argument you can specify extra locations for mcstas components

if you have no errors and have two files: local_var.py and instrument.py in your working directory the setup stepp is compleated

First Use

with mcpw_manager you can execute your simulation and all relevant functions you added to the analyse and post_mcrun_funktions functions.

the minimal command to run a simmulation is:

mcpw_manager -p instrument.py local

Use of Scan class and var_lists

Scan Class

The mcvariables class contains a variable called scan that is object of the Scan class. The first two arguments are the start and stop range for the Scan, the 3. value is a string which represents the unit of the scan variable. the 4. value is the number of steps. The scan points are evenly distributed between the start and stop points, which are included.

Scaning with a csv file

witch the -l, --list argument you can provide a csv file with datapoints. The first row has to be a header row containing the names of the variables below them. the names have to match with the once in you instrument. Each row represents one simulation and has to be fully filled with values that can be cast to a python float. variable that dont change at all dont need to be part of the list and will be taken from the mcvariable class.

mini example csv:

  x,    y,   z
  1,    4,   7
1.4,    6,   9
  2, 4e-4, 9e5

Jupyter Notebook Usage

This Package can be used also in jupyter notebook.

First you have to import the basic functions initialize, simulate, load_mcvariables:

from mcpw.jupyter_functions import initialize, simulate, load_mcvariables

next you have to initialize the local variables:

var = initialize(instrument='instrument.instr', working_dir='relative_or_absolute_path'(optional), mcstas='mcstas_path_or_link'(optional), output_dir='simulation_results'(optional), component_dir='relative_or_absolute_path'(optional), mpi=#cores(optional)

the default for mcstas is 'mcstas' You will get a printout for your mcvariable class. copy the section into the next cell and execute it.

now var and mcvar should be initialized.

now you can run a simmulation with

mcvar, res = simulate(var,mcvar, dn='bla')

this function returns the used mcvariables and a list of result directorys where the simulation results are saved. if the command is called a second time with the same value for dn, the mcvariables and result directorys for this dn will be loaded end returned

if you want to use the default mcstas plotter, you can import it:

from mcpw.mcstas_wrapper import mcplot
mcplot(var,mcvar)

Special function custom():

if this function exists in the python file and the mode is set to custom, the compile steps are executed and then the custom function is executed, followed by the analyse function. This is highly advanced. you need to make shure that the check_for_detector_output function, psave function, and other critical functions are executed. This function takes the place of the run_instrument() function as well as all save functions.

Command Usage

Usage of mcpw_manager

usage: mcpw_manager [-h] -p PYTHON_FILE [-d RESULT_DIR] mode ...

Control command for automatic mcstas usage for the Reseda Instrument

optional arguments:
  -h, --help            show this help message and exit
  -p PYTHON_FILE, --python_file PYTHON_FILE
                        path (absolute or not) to the python file containing mcvariables and analyse functions
  -d RESULT_DIR, --result-dir RESULT_DIR
                        directory name for the simulationresults. If none is given or foulder name exists allrady, a increment Folder Name is generated
  -l LIST, --list LIST  a file containing variables in csv format. first row has to match with variable names occuring in the instrument. variables that are not in here take the value from the py file. each row is a single simmulation.
                        list will be saved together with the result for later use 

modes:
  Use 'manager mode --help' to view the help for any command.

  mode
    server              mcstas will be executed localy and the processed simulation results packed in a tarball
    remote              mcstas will be executed on a remote machine
    local               mcstas will be executed on localy
    full                mcstas will be executed on localy and the analyze function will be called after
    analyse             analyse function will be called
	custom              runs the mcstas compiler, c compiler and a everyting that is in the function called custom in your python file. analyse function will be called !!!EXTREMLY EXPERIMENTAL!!!

Usage of mcpw_setup

usage: mcpw_setup [-h] -I INSTRUMENT [-d WORKING_DIR] [-m MCSTAS] [-o OUTPUT_DIR] [-c COMPONENT_DIR] mode ...

Script to create a python file to control a McStas Instrument with MPW

optional arguments:
  -h, --help            show this help message and exit
  -I INSTRUMENT, --instrument INSTRUMENT
                        mcstas instrument you want to control with mpw
  -d WORKING_DIR, --working_dir WORKING_DIR
                        path to working directory (optional)
  -m MCSTAS, --mcstas MCSTAS
                        path to mcstas executable; default=mcstas
  -o OUTPUT_DIR, --output_dir OUTPUT_DIR
                        name in the simulation results directory; default=simulation_results
  -c COMPONENT_DIR, --component_dir COMPONENT_DIR
                        additional directory where mcstas will search for components; default=""