calc_area

calculate the correlation and convolution

uiopen('E:\matlab code\calc_area',1)
cd('C:\MATLAB6p5\work');
calc_area
??? Undefined function or variable 'calc_area'.

cd('E:\matlab code');
calc_area
the area of the circle is : 19.635
path

		MATLABPATH

	C:\MATLAB6p5\toolbox\matlab\general
	C:\MATLAB6p5\toolbox\matlab\ops
	C:\MATLAB6p5\toolbox\matlab\lang
	C:\MATLAB6p5\toolbox\matlab\elmat
	C:\MATLAB6p5\toolbox\matlab\elfun
	C:\MATLAB6p5\toolbox\matlab\specfun
	C:\MATLAB6p5\toolbox\matlab\matfun
	C:\MATLAB6p5\toolbox\matlab\datafun
	C:\MATLAB6p5\toolbox\matlab\audio
	C:\MATLAB6p5\toolbox\matlab\polyfun
	C:\MATLAB6p5\toolbox\matlab\funfun
	C:\MATLAB6p5\toolbox\matlab\sparfun
	C:\MATLAB6p5\toolbox\matlab\graph2d
	C:\MATLAB6p5\toolbox\matlab\graph3d
	C:\MATLAB6p5\toolbox\matlab\specgraph
	C:\MATLAB6p5\toolbox\matlab\graphics
	C:\MATLAB6p5\toolbox\matlab\uitools
	C:\MATLAB6p5\toolbox\matlab\strfun
	C:\MATLAB6p5\toolbox\matlab\iofun
	C:\MATLAB6p5\toolbox\matlab\timefun
	C:\MATLAB6p5\toolbox\matlab\datatypes
	C:\MATLAB6p5\toolbox\matlab\verctrl
	C:\MATLAB6p5\toolbox\matlab\winfun
	C:\MATLAB6p5\toolbox\matlab\winfun\comcli
	C:\MATLAB6p5\toolbox\matlab\demos
	C:\MATLAB6p5\toolbox\local
	C:\MATLAB6p5\toolbox\simulink\simulink
	C:\MATLAB6p5\toolbox\simulink\blocks
	C:\MATLAB6p5\toolbox\simulink\components
	C:\MATLAB6p5\toolbox\simulink\fixedandfloat
	C:\MATLAB6p5\toolbox\simulink\fixedandfloat\fxpdemos
	C:\MATLAB6p5\toolbox\simulink\fixedandfloat\obsolete
	C:\MATLAB6p5\toolbox\simulink\simdemos
	C:\MATLAB6p5\toolbox\simulink\simdemos\aerospace
	C:\MATLAB6p5\toolbox\simulink\simdemos\automotive
	C:\MATLAB6p5\toolbox\simulink\simdemos\simfeatures
	C:\MATLAB6p5\toolbox\simulink\simdemos\simgeneral
	C:\MATLAB6p5\toolbox\simulink\simdemos\simnew
	C:\MATLAB6p5\toolbox\simulink\dee
	C:\MATLAB6p5\toolbox\simulink\dastudio
	C:\MATLAB6p5\toolbox\stateflow\stateflow
	C:\MATLAB6p5\toolbox\stateflow\sfdemos
	C:\MATLAB6p5\toolbox\stateflow\coder
	C:\MATLAB6p5\toolbox\rtw\rtw
	C:\MATLAB6p5\toolbox\rtw\rtwdemos
	C:\MATLAB6p5\toolbox\rtw\rtwdemos\rsimdemos
	C:\MATLAB6p5\toolbox\rtw\targets\asap2\asap2
	C:\MATLAB6p5\toolbox\rtw\targets\asap2\asap2\user
	C:\MATLAB6p5\toolbox\rtw\targets\rtwin\rtwin
	C:\MATLAB6p5\toolbox\aeroblks\aeroblks
	C:\MATLAB6p5\toolbox\aeroblks\aerodemos
	C:\MATLAB6p5\toolbox\ccslink\ccslink
	C:\MATLAB6p5\toolbox\ccslink\ccsdemos
	C:\MATLAB6p5\toolbox\ccslink\rtdxblks
	C:\MATLAB6p5\toolbox\cdma\cdma
	C:\MATLAB6p5\toolbox\cdma\cdmamasks
	C:\MATLAB6p5\toolbox\cdma\cdmamex
	C:\MATLAB6p5\toolbox\cdma\cdmademos
	C:\MATLAB6p5\toolbox\combuilder\combuilder
	C:\MATLAB6p5\toolbox\comm\comm
	C:\MATLAB6p5\toolbox\comm\commdemos
	C:\MATLAB6p5\toolbox\comm\commobsolete
	C:\MATLAB6p5\toolbox\commblks\commblks
	C:\MATLAB6p5\toolbox\commblks\commmasks
	C:\MATLAB6p5\toolbox\commblks\commmex
	C:\MATLAB6p5\toolbox\commblks\commblksdemos
	C:\MATLAB6p5\toolbox\commblks\commblksobsolete\commblksobsolete
	C:\MATLAB6p5\toolbox\compiler
	C:\MATLAB6p5\toolbox\control\control
	C:\MATLAB6p5\toolbox\control\ctrlguis
	C:\MATLAB6p5\toolbox\control\ctrlobsolete
	C:\MATLAB6p5\toolbox\control\ctrlutil
	C:\MATLAB6p5\toolbox\control\ctrldemos
	C:\MATLAB6p5\toolbox\curvefit\curvefit
	C:\MATLAB6p5\toolbox\curvefit\cftoolgui
	C:\MATLAB6p5\toolbox\daq\daq
	C:\MATLAB6p5\toolbox\daq\daqguis
	C:\MATLAB6p5\toolbox\daq\daqdemos
	C:\MATLAB6p5\toolbox\database\database
	C:\MATLAB6p5\toolbox\database\dbdemos
	C:\MATLAB6p5\toolbox\database\vqb
	C:\MATLAB6p5\toolbox\datafeed\datafeed
	C:\MATLAB6p5\toolbox\datafeed\dfgui
	C:\MATLAB6p5\toolbox\dials
	C:\MATLAB6p5\toolbox\dspblks\dspblks
	C:\MATLAB6p5\toolbox\dspblks\dspmasks
	C:\MATLAB6p5\toolbox\dspblks\dspmex
	C:\MATLAB6p5\toolbox\dspblks\dspdemos
	C:\MATLAB6p5\toolbox\rtw\targets\ecoder
	C:\MATLAB6p5\toolbox\rtw\targets\ecoder\ecoderdemos
	C:\MATLAB6p5\toolbox\exlink
	C:\MATLAB6p5\toolbox\filterdesign\filterdesign
	C:\MATLAB6p5\toolbox\filterdesign\quantization
	C:\MATLAB6p5\toolbox\filterdesign\filtdesdemos
	C:\MATLAB6p5\toolbox\finance\finance
	C:\MATLAB6p5\toolbox\finance\calendar
	C:\MATLAB6p5\toolbox\finance\findemos
	C:\MATLAB6p5\toolbox\finance\finsupport
	C:\MATLAB6p5\toolbox\finderiv\finderiv
	C:\MATLAB6p5\toolbox\fixpoint
	C:\MATLAB6p5\toolbox\ftseries\ftseries
	C:\MATLAB6p5\toolbox\ftseries\ftsdemos
	C:\MATLAB6p5\toolbox\ftseries\ftsdata
	C:\MATLAB6p5\toolbox\ftseries\ftstutorials
	C:\MATLAB6p5\toolbox\fuzzy\fuzzy
	C:\MATLAB6p5\toolbox\fuzzy\fuzdemos
	C:\MATLAB6p5\toolbox\garch\garch
	C:\MATLAB6p5\toolbox\garch\garchdemos
	C:\MATLAB6p5\toolbox\ident\ident
	C:\MATLAB6p5\toolbox\ident\idobsolete
	C:\MATLAB6p5\toolbox\ident\idguis
	C:\MATLAB6p5\toolbox\ident\idutils
	C:\MATLAB6p5\toolbox\ident\iddemos
	C:\MATLAB6p5\toolbox\ident\idhelp
	C:\MATLAB6p5\toolbox\images\images
	C:\MATLAB6p5\toolbox\images\imdemos
	C:\MATLAB6p5\toolbox\instrument\instrument
	C:\MATLAB6p5\toolbox\instrument\instrumentdemos
	C:\MATLAB6p5\toolbox\lmi\lmictrl
	C:\MATLAB6p5\toolbox\lmi\lmilab
	C:\MATLAB6p5\toolbox\map\map
	C:\MATLAB6p5\toolbox\map\mapdisp
	C:\MATLAB6p5\toolbox\map\mapproj
	C:\MATLAB6p5\toolbox\matlabxl\matlabxl
	C:\MATLAB6p5\toolbox\mbc\mbc
	C:\MATLAB6p5\toolbox\mbc\mbcdata
	C:\MATLAB6p5\toolbox\mbc\mbcdesign
	C:\MATLAB6p5\toolbox\mbc\mbcexpr
	C:\MATLAB6p5\toolbox\mbc\mbcguitools
	C:\MATLAB6p5\toolbox\mbc\mbclayouts
	C:\MATLAB6p5\toolbox\mbc\mbcmodels
	C:\MATLAB6p5\toolbox\mbc\mbcsimulink
	C:\MATLAB6p5\toolbox\mbc\mbctools
	C:\MATLAB6p5\toolbox\mbc\mbcview
	C:\MATLAB6p5\toolbox\physmod\mech\mech
	C:\MATLAB6p5\toolbox\physmod\mech\mechdemos
	C:\MATLAB6p5\toolbox\mpc\mpccmds
	C:\MATLAB6p5\toolbox\mpc\mpcdemos
	C:\MATLAB6p5\toolbox\rtw\targets\mpc555dk\mpc555dk
	C:\MATLAB6p5\toolbox\rtw\targets\mpc555dk\common\canlib\blockset
	C:\MATLAB6p5\toolbox\rtw\targets\mpc555dk\common\canlib\blockset\mfiles
	C:\MATLAB6p5\toolbox\rtw\targets\mpc555dk\common\vectorlib\blockset
	C:\MATLAB6p5\toolbox\rtw\targets\mpc555dk\common\vectorlib\blockset\mfiles
	C:\MATLAB6p5\toolbox\rtw\targets\mpc555dk\common\configuration
	C:\MATLAB6p5\toolbox\rtw\targets\mpc555dk\pil
	C:\MATLAB6p5\toolbox\rtw\targets\mpc555dk\rt\blockset
	C:\MATLAB6p5\toolbox\rtw\targets\mpc555dk\rt\blockset\mfiles
	C:\MATLAB6p5\toolbox\rtw\targets\mpc555dk\rt\blockset\mfiles\SimulinkUtilities
	C:\MATLAB6p5\toolbox\rtw\targets\mpc555dk\mpc555demos
	C:\MATLAB6p5\toolbox\mutools\commands
	C:\MATLAB6p5\toolbox\mutools\subs
	C:\MATLAB6p5\toolbox\ncd
	C:\MATLAB6p5\toolbox\nnet\nnet
	C:\MATLAB6p5\toolbox\nnet\nnutils
	C:\MATLAB6p5\toolbox\nnet\nncontrol
	C:\MATLAB6p5\toolbox\nnet\nndemos
	C:\MATLAB6p5\toolbox\nnet\nnobsolete
	C:\MATLAB6p5\toolbox\optim
	C:\MATLAB6p5\toolbox\pde
	C:\MATLAB6p5\toolbox\simulink\perftools
	C:\MATLAB6p5\toolbox\simulink\mdldiff
	C:\MATLAB6p5\toolbox\simulink\simcoverage
	C:\MATLAB6p5\toolbox\rtw\accel
	C:\MATLAB6p5\toolbox\powersys\powersys
	C:\MATLAB6p5\toolbox\powersys\powerdemo
	C:\MATLAB6p5\toolbox\reqmgt
	C:\MATLAB6p5\toolbox\robust
	C:\MATLAB6p5\toolbox\rptgen
	C:\MATLAB6p5\toolbox\rptgenext
	C:\MATLAB6p5\toolbox\runtime
	C:\MATLAB6p5\toolbox\sb2sl
	C:\MATLAB6p5\toolbox\signal\signal
	C:\MATLAB6p5\toolbox\signal\sigtools
	C:\MATLAB6p5\toolbox\signal\sptoolgui
	C:\MATLAB6p5\toolbox\signal\sigdemos
	C:\MATLAB6p5\toolbox\splines
	C:\MATLAB6p5\toolbox\stats
	C:\MATLAB6p5\toolbox\symbolic
	C:\MATLAB6p5\toolbox\rtw\targets\tic6000\tic6000
	C:\MATLAB6p5\toolbox\rtw\targets\tic6000\blks
	C:\MATLAB6p5\toolbox\vr\vr
	C:\MATLAB6p5\toolbox\vr\vrdemos
	C:\MATLAB6p5\toolbox\wavelet\wavelet
	C:\MATLAB6p5\toolbox\wavelet\wavedemo
	C:\MATLAB6p5\toolbox\webserver\webserver
	C:\MATLAB6p5\toolbox\webserver\wsdemos
	C:\MATLAB6p5\toolbox\rtw\targets\xpc\xpc
	C:\MATLAB6p5\toolbox\rtw\targets\xpc\target\build\xpcblocks
	C:\MATLAB6p5\toolbox\rtw\targets\xpc\xpcdemos
	C:\MATLAB6p5\toolbox\rtw\targets\xpc\target\kernel\embedded
	C:\MATLAB6p5\work
which xcorr
C:\MATLAB6p5\toolbox\signal\signal\xcorr.m
clc
rmpath
which xcorr
C:\MATLAB6p5\toolbox\signal\signal\xcorr.m
e
??? Undefined function or variable 'e'.

ln10
??? Undefined function or variable 'ln10'.

log2
??? Error using ==> log2
Not enough input arguments.

log(2)

ans =

    0.6931

pi

ans =

    3.1416

comm = 'i am a good boy'

comm =

i am a good boy

x = [1 2 4 4];
y = zeros(1,10