[EE] Forum and Sites
DSP related:
http://www.dsprelated.com/
Wednesday, November 15, 2006
Monday, November 06, 2006
Friday, November 03, 2006
Monday, October 02, 2006
[Matlab][Cpp] Time Telling
[Matlab] Generate file name with time
Codes:
fname = sprintf('myfilename_%02d%02d%02d%02d.txt', currTime(2:5) );
[Matlab]Timer
Measure how many seconds were elapsed.Source:
Matlab HelpCodes:
%%%%%%%%%%%%%%%%
% 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.htmlCodes:
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.htmlCodes:
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 timeSource:
http://www.cplusplus.com/reference/clibrary/ctime/ctime.htmlCodes:
#include <stdio.h>
#include <time.h>
int main ()
{
time_t rawtime; }
time ( &rawtime );
printf ( "The current local time is: %s", ctime (&rawtime) );
return 0;
Monday, August 28, 2006
[Tools] Site Links
Equation Sheet
A website containing many frequently used equations including following fields:Calculus
Chemistry
Geometry
Physics
Signal Processing
Statistics
Trigonometry
Thursday, August 24, 2006
[Matlab][CPP] Execute Command Line Commands
[Matlab] Execute Command Line Commands
Source
Matlab HelpsSyntax:
[status, result] = system('command')[CPP] Execute Command Line Commands
Source
Microsoft MSDNSyntax:
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.htmlhttp://www.mathworks.com/access/helpdesk/help/techdoc/ref/print.html
Syntax:
Method 1:
saveas(h,'filename','format')
Method 2: (Using print function which allows user-defined print size)
set(h, 'PaperUnits', 'points');
set(h, 'PaperSize', [width height] );
print -dformat -rresolution filename;
Example:
Method 1:
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:
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:
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.htmlSyntax
xlim([xmin xmax]);[Matlab] Startup Options
Source:
Matlab Help: Startup OptionsOptions:
/c licensefilefor options use '/' in Windows; use '-' in UNIX.
Example:
matlab -r "plot( sin([1:10]) )" % Call a function with argument
NOTES:
matlab won't automatically close after running the script/function. Better to put "exit;" at the end of the script or after the funtion likeTuesday, August 22, 2006
[Perl] Site Links
Forums
http://forums.devshed.com/perl-programming-6/Sites
Perl Beginners First Response A website that provides many FAQ search results (Not sure if there are resources other than search results). I have difficulty using the search engine in this website, but an alternative is to google my question with keyword "Perl Beginners First Response"Monday, August 21, 2006
[Perl] Basic Hash operations
Source:
Perl Howto --> Hash by Alex BATKO <abatko AT cs.mcgill.ca>Codes:
my %hash = ();%hash = ( 'key1', 'value1', 'key2', 'value2', 'key3', 'value3');
%hash = ( 'key1' => 'value1',
'key2' => 'value2',
'key3' => 'value3' );
$hash{ $key } = $value;
my %hash_copy = %hash;
if exists $hash{ $key };
if defined $hash{ $key };
if $hash{ $key };
delete $hash{$key}
# size of a hash
my $hash_size = keys( %hash );
# Process each key of the hash
while ( my ($key, $value) = each(%hash) ) { print "$key => $value\n"; }
for my $key ( keys %hash )
{
For Hash references:
my $hash_ref = 0;
$hash_ref->{ $key } = $value; # $hash_ref is a reference of a hash.
delete $hash_ref->{$key};
# size of a hash
my $hash_ref_copy = $hash_ref;
my $hash_ref_size = 0; $hash_ref_size += scalar keys %$hash_ref;
# Process each key of the hash
while ( my ($key, $value) = each(%$hash_ref) ) { print "$key => $value\n"; }
[Life] Site Links
http://www.flightstats.com/
A website to check the U.S. Flight status.How Far Is It?
A website calculating how far two locations (on earth? Not sure about the universe) are.Friday, August 11, 2006
[ENGL] Site Links
WordReference Forums
A forum discussing words and idioms.Englishforums.com
A forum for learning English / Letter writing / GrammaMonday, July 31, 2006
[Matlab]Functions
B = squeeze(A):
Remove the dimensions of size 1;
Remove the redundant dimensions.
B = repmat(A,[m n p...]):
B = sub2ind(size,sub1, sub2, ...);
B = ind2sub(size, index);
profile on;
...
profile viewer;
Thursday, July 27, 2006
Wednesday, July 26, 2006
Tuesday, July 18, 2006
Monday, July 17, 2006
[Matlab] reshape
OUT = reshape(IN, [m n p ...] );
For input matrix IN, the data to be taken is of the following order:
IN[2,1,1,...];
IN[3,1,1,...];
...
IN[1,2,1,...];
IN[2,2,1,...];
...
Similarly, the data to be assigned in output matrix OUT is of the following order:
OUT[2,1,1,...];
OUT[3,1,1,...];
...
OUT[1,2,1,...];
OUT[2,2,1,...];
...
Monday, July 10, 2006
[CPP] Using const
Source:
Declaring a const variable
- General Rule: The 'const' qualifier works on everything on the left of it.
- Convention: If a type T is not a reference or a pointer, a constant variable of type T can be declared by putting 'const' in front of T
Passing reference-to-const v.s. passing pointer-to-const
Taking the pointer to a temporary is not allowed but it is possible to pass a temporary to a function as a reference-to-const:void foobar(T const&);
foobar( T() ); // Allowed.
Constant/non-constant method and constant/non-constant returned value
class Foo
{
public:
/* private:
* Modifies m_widget and the user
* may modify the returned widget.
*/
Widget *widget();
/*
* Does not modify m_widget but the
* user may modify the returned widget.
*/
Widget *widget() const;
/*
* Modifies m_widget, but the user
* may not modify the returned widget.
*/
const Widget *cWidget();
/*
* Does not modify m_widget and the user
* may not modify the returned widget.
*/
const Widget *cWidget() const;
Widget *m_widget; }
- Const method: A method that does not modify the member variables of a class. Calling non-constant methods within a const method is not allowed.
Friday, July 07, 2006
[FINANCE] Site Links
MarketingShift
San Diego Source | San Diego Daily Transcript
I saw some investing info from the columnist Brent Wilsey楚狂人的Blog
(Trad. Chinese)Thursday, July 06, 2006
[HTML] Special Characters
Source:
http://www.w3.org/MarkUp/html-spec/html-spec_13.html
REFERENCE DESCRIPTION
-------------- -----------
� -  Unused
	 Horizontal tab
Line feed
 -  Unused
Carriage Return
 -  Unused
  Space
! Exclamation mark
" Quotation mark
# Number sign
$ Dollar sign
% Percent sign
& Ampersand
' Apostrophe
( Left parenthesis
) Right parenthesis
* Asterisk
+ Plus sign
, Comma
- Hyphen
. Period (fullstop)
/ Solidus (slash)
0 - 9 Digits 0-9
: Colon
; Semi-colon
< Less than
= Equals sign
> Greater than
? Question mark
@ Commercial at
A - Z Letters A-Z
[ Left square bracket
\ Reverse solidus (backslash)
] Right square bracket
^ Caret
_ Horizontal bar (underscore)
` Acute accent
a - z Letters a-z
{ Left curly brace
| Vertical bar
} Right curly brace
~ Tilde
 - Ÿ Unused
  Non-breaking Space
¡ Inverted exclamation
¢ Cent sign
£ Pound sterling
¤ General currency sign
¥ Yen sign
¦ Broken vertical bar
§ Section sign
¨ Umlaut (dieresis)
© Copyright
ª Feminine ordinal
« Left angle quote, guillemotleft
¬ Not sign
­ Soft hyphen
® Registered trademark
¯ Macron accent
° Degree sign
± Plus or minus
² Superscript two
³ Superscript three
´ Acute accent
µ Micro sign
¶ Paragraph sign
· Middle dot
¸ Cedilla
¹ Superscript one
º Masculine ordinal
» Right angle quote, guillemotright
¼ Fraction one-fourth
½ Fraction one-half
¾ Fraction three-fourths
¿ Inverted question mark
À Capital A, grave accent
Á Capital A, acute accent
 Capital A, circumflex accent
à Capital A, tilde
Ä Capital A, dieresis or umlaut mark
Å Capital A, ring
Æ Capital AE dipthong (ligature)
Ç Capital C, cedilla
È Capital E, grave accent
É Capital E, acute accent
Ê Capital E, circumflex accent
Ë Capital E, dieresis or umlaut mark
Ì Capital I, grave accent
Í Capital I, acute accent
Î Capital I, circumflex accent
Ï Capital I, dieresis or umlaut mark
Ð Capital Eth, Icelandic
Ñ Capital N, tilde
Ò Capital O, grave accent
Ó Capital O, acute accent
Ô Capital O, circumflex accent
Õ Capital O, tilde
Ö Capital O, dieresis or umlaut mark
× Multiply sign
Ø Capital O, slash
Ù Capital U, grave accent
Ú Capital U, acute accent
Û Capital U, circumflex accent
Ü Capital U, dieresis or umlaut mark
Ý Capital Y, acute accent
Þ Capital THORN, Icelandic
ß Small sharp s, German (sz ligature)
à Small a, grave accent
á Small a, acute accent
â Small a, circumflex accent
ã Small a, tilde
ä Small a, dieresis or umlaut mark
å Small a, ring
æ Small ae dipthong (ligature)
ç Small c, cedilla
è Small e, grave accent
é Small e, acute accent
ê Small e, circumflex accent
ë Small e, dieresis or umlaut mark
ì Small i, grave accent
í Small i, acute accent
î Small i, circumflex accent
ï Small i, dieresis or umlaut mark
ð Small eth, Icelandic
ñ Small n, tilde
ò Small o, grave accent
ó Small o, acute accent
ô Small o, circumflex accent
õ Small o, tilde
ö Small o, dieresis or umlaut mark
÷ Division sign
ø Small o, slash
ù Small u, grave accent
ú Small u, acute accent
û Small u, circumflex accent
ü Small u, dieresis or umlaut mark
ý Small y, acute accent
þ Small thorn, Icelandic
ÿ Small y, dieresis or umlaut mark
[SOFTWARE] List of my favorites
ExamDiff
http://www.prestosoft.com/ps.asp?page=edp_examdiffA freeware to compare text or binary files.
PSPad
A free text editor for various programming languages. DownloadVirtuaWin
Virtual Desktops for WindowsPersonal Brain
A thought mapping tool. Download
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