[Matlab] Use Plain Text in labels and legends

Source

Matlab Help. Search for keyword 'interpreter'.

Description

To print the labels and the legends in plain text such that `_' and `^' will not be transcribed to subscript and superscript specifier.

Syntax

% Interpreter_type: 'latex' | {'tex'} | 'none'
set(handle, 'Interpreter', Interpreter_type );

Code

h_label = xlabel('MY_LABEL');
set(h_label, 'Interpreter', 'none');

h_legend = legend('LEG_1', 'LEG_2');
set(h_legend, 'Interpreter', 'none');

[Matlab][Debug]mxDestroyArray

Source

Matlab Help: Memory Management Compatibility Issues

Syndrome

The matlab engine properly opens and closes at the first time. But at the second attempt of starting matlab engine the error message pops up:

Forced Assertion: "Corrupted memory block found"

Cause

• mxDestroyArray was called on a mxArray whose data was not assigned by matlab API

  mxArray *temp = mxCreateDoubleMatrix(1,5,mxREAL);
  double data[5] = {1,2,3,4,5};
  ...
  memcpy(mxGetPr(temp), data, 5*sizeof(double));
  ...
  mxDestroyArray(temp); // <-- INCORRECT. Do NOT call mxDestroyArray on temp

Solution

• Do NOT call mxDestroyArray on such mxArray's

C++ and C FAQ

Source

Comeau C++ and C FAQ

Embedded System Design

C++ FAQ LITE

Description

You can probably find answers to the fundamental questions about c++ programming.

Memo

• Constant objects can be declared with various types and user can access the address of the constant objects.
• Enumeration Constants can only be integers and the address of enumeration constant is not available. But it also means that compilers won't generate codes for the ability to take the address, which becomes an advantage of using enumeration constants if users do not need the address of the constant.
• When writing class template, the definition and the declaration should "be seen by compiler at the same time," which means one may 1. write both the declaration and the implementation in the same file (the .h file); 2. include the implementation file (.cpp) in the header file (.h), not include the header file in the implmenetation file. To explain this in one sentence: A class template is not a real class and the compiler will not see the functions of the class template with specified type.

[LINUX] Bash Programming

Source

BASH Programming - Introduction HOW-TO by Mike G
Advanced Bash-Scripting Guide by Mendel Cooper
Bourne Shell Programming

[LINUX] If The Script Does Not Run

Check:

• Is the script saved in Linux/Unix format (If saved in DOS format you may see "Command not found" error message). The command to remove the '\r' from DOS format is

  $ tr -d '\r' < DOS_file > UNIX_file

  The '<' is to input the DOS_file to command 'tr' and '>' is to output the file without '\r'. The commands including UNIX-to-DOS conversion can be found here
• Is the script executable (if not you may see "Permission denied" error message

[Software] PSPad Issues

PSPad changes the unix permission when editing files

Forum discussion: http://forum.pspad.com/read.php?2,18205,18205#msg-18205
Solution:

Program settings --> Direct edit
[x]DontChangeFileAttribs=1

[Perl] Regular Expression With Chinese Char

Use \Q中文字\E

Windows Batch Commands

Source

http://www.computerhope.com/batch.htm

Run .bat file in a .bat file

Codes:

call bat1.bat
call bat2.bat

[Matlab] Plot lines with different markers

Source

Matlab Help:

• Find "LineSpec" to see the available markers

Codes

% Initialize a set of desired markers
MarkerSet = 'x*o+s.^v';
plot( x, y ); grid on;
% Obtain all line handles under current axes handle
hdl = findobj(gca,'Type','line');
for k=1:length(hdl)

% Assign markers to each line handle
set(hdl(k), 'marker', MarkerSet(k) );

end

[Matlab] Plotyy and the Labeling

Source:

Matlab Help

Codes:

MY_XLABEL = 'This is xlabel';
MY_Y1LABEL = 'This is y1 label';
MY_Y2LABEL = 'This is y2 label';
MY_Y1LEGEND = {'y1_lg1', 'y1_lg2' };
MY_Y2LEGEND = {'y2_lg1', 'y2_lg2' };
MY_TITLE = 'This is my title';

[AX,H1,H2] = plotyy(x1, y1, x2, y2);
xlabel( MY_XLABEL );
set(get(AX(1),'Ylabel'),'String', MY_Y1LABEL );
set(get(AX(2),'Ylabel'),'String', MY_Y2LABEL );
legend(H1, MY_Y1LEGEND, 'Location', 'NorthWest' );
legend(H2, MY_Y2LEGEND, 'Location', 'NorthEast' );
title( MY_TITLE );

[HTML] Symbol Reference

Greek, mathematical, symbolic characters, and so on.
http://everything2.com/index.pl?node=HTML%20symbol%20reference

[Matlab] Data Clipping, saturation

% 'x > upperbound' evaluates to a logical index
x = array to be clipped;
x( x > upperbound ) = upperbound;
x( x < lowerbound ) = lowerbound;

Quotes

"There is only one thing more beautiful than one guitar - Two guitars" Frederic Chopin

[EE] Forum and Sites

DSP related:
http://www.dsprelated.com/

[Math] Statistics Online Resources

http://davidmlane.com/hyperstat/index.html

[HTML] Tags

Link:

Bare Bones Guide to HTML

Frequently Used Tags

4.0*

Underline

<U></U>

(not widely implemented)

[Matlab][Cpp] Time Telling

[Matlab] Generate file name with time

Codes:

currTime = clock;
fname = sprintf('myfilename_%02d%02d%02d%02d.txt', currTime(2:5) );

---

[Matlab]Timer

Measure how many seconds were elapsed.

Source:

Matlab Help

Codes:

t1 = clock;
%%%%%%%%%%%%%%%%
% Run your scripts
%%%%%%%%%%%%%%%%
t2 = clock;
Elapsed = etime(t2,t1);

---

[CPP] Timer Code

Measure how many seconds were elapsed.

Source:

http://www.cplusplus.com/ref/ctime/time.html

Codes:

#include <time.h>
time_t stime, etime;
stime = time(NULL);
...<Codes to be timed.>...
etime = time(NULL);
printf("Time elapsed: %ld seconds\n", etime-stime);

---

[CPP] Wait function

Make the program wait for several seconds.

Source:

http://www.cplusplus.com/ref/ctime/clock.html

Codes:

#include <time.h>

int seconds = 10;
clock_t endwait;
endwait = clock () + seconds * CLOCKS_PER_SEC ;
while (clock() < endwait) {}

---

[CPP] Print time/date info

Print the current date and time

Source:

http://www.cplusplus.com/reference/clibrary/ctime/ctime.html

Codes:

#include <stdio.h>
#include <time.h>

int main ()
{

time_t rawtime;

time ( &rawtime );
printf ( "The current local time is: %s", ctime (&rawtime) );

return 0;

}

[Tools] Site Links

Equation Sheet

A website containing many frequently used equations including following fields:

Algebra
Calculus
Chemistry
Geometry
Physics
Signal Processing
Statistics
Trigonometry

[Matlab][CPP] Execute Command Line Commands

[Matlab] Execute Command Line Commands

Source

Matlab Helps

Syntax:

[status, result] = system('command')

---

[CPP] Execute Command Line Commands

Source

Microsoft MSDN

Syntax:

int result = system( const char *command );

Codes:

char cmd[200];
sprintf( cmd, "copy output.txt output_%d_%d_%d.txt", i, j, k);
system( cmd );

[Matlab] Figure Commands

Save Figure

Source:

http://www.mathworks.com/access/helpdesk/help/techdoc/ref/saveas.html
http://www.mathworks.com/access/helpdesk/help/techdoc/ref/print.html

Syntax:

Method 1:

saveas(h,'filename.ext')
saveas(h,'filename','format')

Method 2: (Using print function which allows user-defined print size)

set(h, 'PaperPositionMode', 'auto' );
set(h, 'PaperUnits', 'points');
set(h, 'PaperSize', [width height] );
print -dformat -rresolution filename;

Example:

Method 1:

h = figure;
plot(sin(0:0.1/2*pi:2*pi));
saveas(h, 'd:\temp\test.jpg'); %Automatically save it as a jpeg file
saveas(h, 'd:\temp\test.dat', 'fig'); % Force matlab to save it as a fig file

Method 2:

h = figure('Position', [1 100 900 500] );
plot(sin(0:0.1/2*pi:2*pi));

% Set 'PaperPositionMode' to 'auto' so that the print function will not resize the figure
set(h, 'PaperPositionMode', 'auto' );
% Set 'PaperUnits' to 'points' so that the the paper size can be defined in points.
set(h, 'PaperUnits', 'points');
% Set 'PaperSize' to the desired size in points. For some reason the value of width and height will be 4/3 times in pixels in the output file when printing the file at screen resolution (using -r0).
set(h, 'PaperSize', [900 500]*3/4 );
% use '-djpeg' to print the file in jpeg format. Use -r0 to specify the print resolution equal to screen resolution.
print -djpeg -r0 'test.jpg'

Support formats:

ai: Adobe Illustrator `88
bmp: Windows bitmap
emf: Enhanced metafile
eps: EPS Level 1
fig: MATLAB figure (invalid for Simulink models)
jpg: JPEG image (invalid for Simulink models)
m: MATLAB M-file (invalid for Simulink models)
pbm: Portable bitmap
pcx: Paintbrush 24-bit
pgm: Portable Graymap
png: Portable Network Graphic
sppm: Portable Pixmap
tif: TIFF image, compressed

Adjust the plot range

Source:

http://www.mathworks.com/access/helpdesk/help/techdoc/ref/index.html?/access/helpdesk/help/techdoc/ref/xlim.html

Syntax

xlim([xmin xmax]);