Probability density function - PDF (exp2pdf 2.1)

Program features | Usage | Download and Installation | About the program | Acknowledgements | Access count | Last update Feb 26, 2010

Program features

• This program is dedicated to the evaluation of experimentally measured property (typically elastic modulus, hardness, etc.).
• It produces pointwise probability density function from the list of point measurements in the form of the histogram. It follows that the sum of the resulting densities is equal to 1.
• The histogram is categorized. Maximum and minimum values of the categories can be chosen (by default: max and min values found in the input file are taken).
• The whole interval between max and min is subdivided into equidistant bins. The bin size can be chosen (default binsize=1).

• Count of input data
• Sum of PDF point values
• Sum of PDF values times binsize (i.e.integral value) should be theoretically exactly 1. If not, maximum or minimum PDF category should be increased in order to cover whole range of values.

Usage

1. Select Input filename. It is supposed that the property is in the form of one column txt (ascii) format (see Test data in the Download section).
2. Select Output filename. The output PDF will be saved to this file in the two column format [category(i);PDF(i)].
3. Set minimum and maximum PDF categories, if appropriate. By default, minimum and maximum values found in the input file are taken here.
4. Set binsize. The default is 1.
5. Press "Show PDF" button and see the result in the graphical form. The input and output data is shown in the scroll lists on the right and saved to the specified output file.

Running the program using the Test data (in.txt) produces output_PDF.txt file and the result is shown in Fig. 2.
 

Fig.1 Screenshot of the program window at the start	Fig. 2 Example of the usage on the Test data

About the program

The program was written in MATLAB 704.
 It can be run under Matlab environment or installed as a standalone application under Windows XP.

Author: Jiří Němeček, Czech Technical University in Prague, Civil Engineering Faculty

Version 1.0 released on Feb 26, 2010

Download and Installation

Installation guide for the standalone application on Windows XP:

1. make the new folder named e.g. "exp2pdf21"
2. download the zip file into this folder and unzip
3. run "exp2pdf21.exe" (takes some time to install libraries for the first time)

Uninstallation: Delete the "exp2pdf" folder.

Acknowledgements

This program was developed in the frame of research project "GA103/09/1748 - Propojení experimentální nanoindentace s výpočetními nástroji pro homogenizaci nanomechanických vlastností heterogenních materiálů (2009-2011)", i.e. "Integration of experimental nanoindentation with numerical tools for upscaling of nanomechanical properties of heterogeneous materials" .

The software solution was also supported by Jan Mareth.