matlab/general
- General purpose commands.
matlab/ops
- Operators and special characters.matlab/lang
- Language constructs
and debugging.matlab/elmat - Elementary matrices
and matrix manipulation.matlab/specmat - Specialized
matrices.matlab/elfun - Elementary math
functions.matlab/specfun - Specialized math functions.
matlab/matfun
- Matrix functions - numerical linear algebra.matlab/datafun
- Data analysis and Fourier transform functions.matlab/polyfun
- Polynomial and interpolation functions.matlab/funfun
- Function functions - nonlinear numerical methods.matlab/sparfun
- Sparse matrix functions.matlab/plotxy - Two dimensional graphics.
matlab/plotxyz - Three dimensional graphics.
matlab/graphics - General purpose
graphics functions.matlab/color - Color control
and lighting model functions.matlab/sounds - Sound
processing functions.matlab/strfun - Character string functions.
matlab/iofun
- Low-level file I/O functions.matlab/demos - The MATLAB Expo and other demonstrations.
toolbox/chem - Chemometrics Toolbox
toolbox/control -
Control System Toolbox.fdident/fdident - Frequency Domain
System Identification Toolboxfdident/fddemos - Demonstrations
for the FDIDENT Toolboxtoolbox/hispec - Hi-Spec
Toolboxtoolbox/ident - System Identification
Toolbox.toolbox/images - Image Processing Toolbox.
toolbox/local
- Local function library.toolbox/mmle3 - MMLE3 Identification Toolbox.
mpc/mpccmds
- Model Predictive Control Toolboxmpc/mpcdemos - Model Predictive Control Toolbox
mutools/commands - Mu-Analysis and Synthesis Toolbox.: Commands directory
mutools/subs - Mu-Analysis and Synthesis Toolbox -- Supplement
toolbox/ncd - Nonlinear Control Design
Toolbox.nnet/nnet - Neural
Network Toolbox.nnet/nndemos - Neural Network
Demonstrations and Applications.toolbox/optim - Optimization
Toolbox.toolbox/robust - Robust Control Toolbox.
toolbox/signal
- Signal Processing Toolbox.toolbox/splines - Spline Toolbox.
toolbox/stats - Statistics
Toolbox.toolbox/symbolic - Symbolic Math Toolbox.
toolbox/wavbox
- (No table of contents file)simulink/simulink - SIMULINK model analysis
and construction functions.simulink/blocks - SIMULINK block
library.simulink/simdemos - SIMULINK demonstrations and samples.
toolbox/codegen
- Real-Time Workshop
For more help
on directory/topic, type "help topic".>>
help elmat
Elementary matrices and matrix manipulation.
Elementary matrices.
zeros - Zeros matrix.
ones - Ones matrix.
eye
- Identity matrix. rand - Uniformly
distributed random numbers. randn - Normally distributed
random numbers.
linspace - Linearly spaced vector. logspace - Logarithmically spaced vector.
meshgrid
- X and Y arrays for 3-D plots. :
- Regularly spaced vector.
Special variables and constants.
ans
- Most recent answer. eps - Floating
point relative accuracy. realmax - Largest floating point number.
realmin - Smallest positive floating point number.
pi
- 3.1415926535897.... i, j - Imaginary
unit.
inf - Infinity. NaN
- Not-a-Number.
flops - Count of floating
point operations. nargin - Number of function
input arguments. nargout - Number of function output
arguments.
computer - Computer type. isieee - True for computers with IEEE arithmetic.
isstudent
- True for the Student Edition. why
- Succinct answer. version - MATLAB version number.
Time and dates.
clock - Wall clock.
cputime - Elapsed CPU time.
date
- Calendar. etime - Elapsed time function.
tic, toc - Stopwatch timer functions.
Matrix manipulation.
diag - Create or extract diagonals.
fliplr
- Flip matrix in the left/right direction. flipud -
Flip matrix in the up/down direction. reshape - Change
size.
rot90 - Rotate matrix 90 degrees. tril - Extract lower triangular part.
triu - Extract upper triangular part.
: - Index into matrix, rearrange matrix.
>> help specmat
Specialized matrices.
compan
- Companion matrix. gallery - Several small test matrices.
hadamard - Hadamard matrix.
hankel -
Hankel matrix.
hilb - Hilbert matrix. invhilb - Inverse Hilbert matrix.
kron
- Kronecker tensor product. magic - Magic square.
pascal - Pascal matrix.
rosser
- Classic symmetric eigenvalue test problem. toeplitz -
Toeplitz matrix. vander - Vandermonde matrix.
wilkinson - Wilkinson's eigenvalue test matrix.
>> help elfun
Elementary math functions.
Trigonometric.
sin - Sine.
sinh
- Hyperbolic sine. asin - Inverse sine.
asinh - Inverse hyperbolic sine.
cos
- Cosine. cosh - Hyperbolic
cosine.
acos - Inverse cosine. acosh - Inverse hyperbolic cosine.
tan
- Tangent. tanh - Hyperbolic
tangent.
atan - Inverse tangent. atan2 - Four quadrant inverse tangent.
atanh
- Inverse hyperbolic tangent. sec - Secant.
sech - Hyperbolic secant.
asec
- Inverse secant. asech - Inverse hyperbolic
secant.
csc - Cosecant. csch - Hyperbolic cosecant.
acsc
- Inverse cosecant. acsch - Inverse hyperbolic
cosecant.
cot - Cotangent. coth - Hyperbolic cotangent.
acot
- Inverse cotangent. acoth - Inverse hyperbolic
cotangent.
Exponential.
exp - Exponential.
log
- Natural logarithm. log10 - Common logarithm.
sqrt - Square root.
Complex.
abs - Absolute value.
angle
- Phase angle. conj - Complex conjugate.
imag - Complex imaginary part.
real
- Complex real part.
Numeric.
fix
- Round towards zero. floor - Round towards
minus infinity.
ceil - Round towards plus infinity. round - Round towards nearest integer.
rem
- Remainder after division. sign - Signum function.
>> help specfun
Specialized math
functions.
besselj - Bessel function of the first kind.
bessely
- Bessel function of the second kind. besseli - Modified
Bessel function of the first kind. besselk - Modified Bessel function
of the second kind. beta - Beta function.
betainc - Incomplete beta function.
betaln
- Logarithm of beta function. ellipj - Jacobi elliptic functions.
ellipke - Complete elliptic integral.
erf - Error function.
erfc
- Complementary error function. erfcx -
Scaled complementary error function. erfinv - Inverse error function.
expint - Exponential integral function.
gamma
- Gamma function. gcd - Greatest
common divisor.
gammainc - Incomplete gamma function. lcm - Least common multiple.
legendre
- Associated Legendre function. gammaln - Logarithm
of gamma function. log2 - Dissect floating
point numbers.
pow2 - Scale floating point numbers. rat - Rational approximation.
rats
- Rational output. cart2sph - Transform from Cartesian to spherical
coordinates.
cart2pol - Transform from Cartesian to polar coordinates. pol2cart - Transform from polar to Cartesian coordinates.
sph2cart
- Transform from spherical to Cartesian coordinates.>> help matfun
Matrix functions - numerical linear algebra.
Matrix analysis.
cond - Matrix condition
number.
norm - Matrix or vector norm. rcond - LINPACK reciprocal condition estimator.
rank - Number of linearly independent rows or columns.
det - Determinant.
trace
- Sum of diagonal elements. null - Null space.
orth - Orthogonalization.
rref
- Reduced row echelon form.
Linear equations.
\ and /
- Linear equation solution; use "help slash". chol
- Cholesky factorization. lu -
Factors from Gaussian elimination. inv - Matrix
inverse.
qr - Orthogonal-triangular
decomposition.
qrdelete - Delete a column from the QR factorization. qrinsert - Insert a column in the QR factorization.
nnls
- Non-negative least-squares. pinv - Pseudoinverse.
lscov - Least squares in the presence of known covariance.
Eigenvalues and singular values.
eig
- Eigenvalues and eigenvectors. poly
- Characteristic polynomial. polyeig - Polynomial eigenvalue problem.
hess - Hessenberg form.
qz
- Generalized eigenvalues. rsf2csf - Real block diagonal form
to complex diagonal form. cdf2rdf - Complex diagonal form to
real block diagonal form. schur - Schur decomposition.
balance - Diagonal scaling to improve eigenvalue accuracy.
svd - Singular value decomposition.
Matrix functions.
expm - Matrix exponential.
expm1 - M-file implementation of expm.
expm2
- Matrix exponential via Taylor series. expm3 - Matrix exponential via eigenvalues and eigenvectors.
logm - Matrix logarithm.
sqrtm
- Matrix square root. funm - Evaluate
general matrix function.>> help general
General purpose commands.
MATLAB Toolbox Version 4.2a 25-Jul-94
Managing commands and functions.
help - On-line documentation.
doc
- Load hypertext documentation. what
- Directory listing of M-, MAT- and MEX-files. type
- List M-file. lookfor - Keyword search through the
HELP entries.
which - Locate functions and files. demo - Run demos.
path
- Control MATLAB's search path.
Managing variables and the workspace.
who
- List current variables. whos - List current
variables, long form. load - Retrieve
variables from disk. save - Save workspace
variables to disk. clear - Clear variables
and functions from memory. pack - Consolidate
workspace memory. size - Size of matrix.
length - Length of vector.
disp
- Display matrix or text.
Working with files and the operating system.
cd - Change current working directory.
dir - Directory listing.
delete
- Delete file. getenv - Get environment value.
! - Execute operating system command.
unix - Execute operating system command & return result.
diary - Save text of MATLAB session.
Controlling
the command window. cedit - Set command line
edit/recall facility parameters. clc - Clear
command window.
home - Send cursor home. format - Set output format.
echo
- Echo commands inside script files. more
- Control paged output in command window.
Starting and quitting from MATLAB.
quit
- Terminate MATLAB. startup - M-file executed when MATLAB
is invoked.
matlabrc - Master startup M-file.
General information.
info - Information
about MATLAB and The MathWorks, Inc. subscribe - Become subscribing user of MATLAB.
hostid - MATLAB server host identification number.
whatsnew
- Information about new features not yet documented. ver
- MATLAB, SIMULINK, and TOOLBOX version information.>> help funfun
Function functions - nonlinear numerical methods.
ode23
- Solve differential equations, low order method. ode23p
- Solve and plot solutions. ode45 - Solve differential
equations, high order method. quad - Numerically
evaluate integral, low order method. quad8 - Numerically evaluate
integral, high order method. fmin - Minimize
function of one variable. fmins - Minimize function
of several variables. fzero - Find zero of function
of one variable. fplot - Plot function.
See also The Optimization Toolbox, which has a comprehensive
set of function functions for optimizing and minimizing functions.
>> help polyfun
Polynomial and interpolation
functions.
Polynomials.
roots
- Find polynomial roots. poly - Construct
polynomial with specified roots. polyval - Evaluate polynomial.
polyvalm - Evaluate polynomial with matrix argument.
residue
- Partial-fraction expansion (residues). polyfit - Fit
polynomial to data. polyder - Differentiate polynomial.
conv - Multiply polynomials.
deconv
- Divide polynomials.
Data interpolation.
interp1
- 1-D interpolation (1-D table lookup). interp2 - 2-D
interpolation (2-D table lookup). interpft - 1-D interpolation using FFT method.
griddata - Data gridding.
Spline interpolation.
spline
- Cubic spline data interpolation. ppval -
Evaluate piecewise polynomial.>> help
ops
Operators and special characters.
Char Name
HELP topic
+ Plus
arith
- Minus
arith *
Matrix multiplication arith .* Array multiplication
arith
^ Matrix power
arith
.^ Array power
arith
\ Backslash or left division slash
/ Slash or right division
slash
./ Array division
slash
kron Kronecker tensor product
kron
: Colon
colon
( ) Parentheses
paren
[ ] Brackets
paren
. Decimal point punct
.. Parent directory
punct
... Continuation
punct
, Comma
punct
; Semicolon
punct
% Comment
punct !
Exclamation point
punct
' Transpose and quote punct =
Assignment
punct
== Equality
relop
<,> Relational operators
relop
& Logical AND
relop | Logical OR
relop
~ Logical NOT
relop
xor Logical EXCLUSIVE OR
xor
Logical characteristics.
exist
- Check if variables or functions are defined. any
- True if any element of vector is true. all - True if all elements of vector are true.
find - Find indices of non-zero elements.
isnan - True for Not-A-Number.
isinf
- True for infinite elements. finite - True for finite elements.
isempty - True for empty matrix.
isreal
- True for real matrix. issparse - True for sparse matrix.
isstr - True for text string.
isglobal
- True for global variables.>>
help lang
Language constructs and debugging.
MATLAB as a programming language.
script -
About MATLAB scripts and M-files. function - Add new function.
eval - Execute string with MATLAB expression.
feval - Execute function specified by string.
global - Define global variable.
nargchk
- Validate number of input arguments. lasterr - Last
error message.
Control flow.
if
- Conditionally execute statements. else
- Used with IF. elseif - Used with IF.
end - Terminate the scope of FOR, WHILE and IF statements.
for - Repeat statements a specific number of times.
while - Repeat statements an indefinite number of times.
break - Terminate execution of loop.
return
- Return to invoking function. error -
Display message and abort function.
Interactive input.
input
- Prompt for user input. keyboard - Invoke keyboard as if it
were a Script-file. menu - Generate
menu of choices for user input. pause - Wait for user
response.
uimenu - Create user interface menu. uicontrol - Create user interface control.
Debugging commands.
dbstop - Set breakpoint.
dbclear -
Remove breakpoint. dbcont -
Resume execution. dbdown - Change local workspace context.
dbstack - List who called whom.
dbstatus - List
all breakpoints. dbstep - Execute one or more lines.
dbtype - List M-file with line numbers.
dbup
- Change local workspace context. dbquit - Quit
debug mode.
mexdebug - Debug MEX-files.>> help plotxy
Two dimensional graphics.
Elementary X-Y graphs.
plot - Linear plot.
loglog -
Log-log scale plot. semilogx - Semi-log scale plot.
semilogy - Semi-log scale plot.
fill -
Draw filled 2-D polygons.
Specialized X-Y graphs.
polar
- Polar coordinate plot. bar - Bar graph.
stem - Discrete sequence or "stem" plot.
stairs
- Stairstep plot. errorbar - Error bar plot.
hist - Histogram plot.
rose
- Angle histogram plot. compass - Compass plot.
feather - Feather plot.
fplot - Plot
function.
comet - Comet-like trajectory.
Graph annotation.
title -
Graph title.
xlabel - X-axis label. ylabel
- Y-axis label. text - Text annotation.
gtext - Mouse placement of text.
grid
- Grid lines.
See also PLOTXYZ, GRAPHICS.
>> help plotxyz
Three dimensional graphics.
Line and area fill commands.
plot3 -
Plot lines and points in 3-D space. fill3 - Draw filled 3-D polygons
in 3-D space.
comet3 - 3-D comet-like trajectories.
Contour and other 2-D plots of 3-D data.
contour
- Contour plot. contour3 - 3-D contour plot.
clabel - Contour plot elevation labels.
contourc
- Contour plot computation (used by contour). pcolor
- Pseudocolor (checkerboard) plot. quiver - Quiver
plot.
Surface and mesh plots.
mesh
- 3-D mesh surface. meshc - Combination mesh/contour
plot.
meshz - 3-D Mesh with zero plane. surf - 3-D shaded surface.
surfc
- Combination surf/contour plot. surfl -
3-D shaded surface with lighting. waterfall - Waterfall plot.
Volume visualization.
slice - Volumetric visualization
plots.
Graph appearance.
view - 3-D graph viewpoint specification.
viewmtx
- View transformation matrices. hidden - Mesh
hidden line removal mode. shading - Color shading mode.
axis - Axis scaling and appearance.
caxis
- Pseudocolor axis scaling. colormap - Color look-up table.
Graph annotation.
title
- Graph title. xlabel - X-axis label.
ylabel - Y-axis label.
zlabel
- Z-axis label for 3-D plots. text - Text annotation.
gtext - Mouse placement of text.
grid
- Grid lines.
3-D objects.
cylinder - Generate
cylinder.
sphere - Generate sphere.
See also COLOR, PLOTXY, GRAPHICS.
>>
help strfun
Character string functions.
General.
strings - About character strings in MATLAB.
abs
- Convert string to numeric values. setstr -
Convert numeric values to string. isstr - True for string.
blanks - String of blanks.
deblank
- Remove trailing blanks. str2mat - Form text matrix from individual
strings.
eval - Execute string with MATLAB
expression.
String comparison.
strcmp
- Compare strings. findstr - Find one string within another.
upper - Convert string to uppercase.
lower
- Convert string to lowercase. isletter - True for
letters of the alphabet. isspace - True for white space characters.
strrep - Replace a string with another.
strtok
- Find a token in a string.
String to number conversion.
num2str
- Convert number to string. int2str - Convert integer to string.
str2num - Convert string to number.
mat2str
- Convert matrix to string. sprintf - Convert number to string
under format control. sscanf - Convert string to number
under format control.
Hexadecimal to number conversion.
hex2num
- Convert hex string to IEEE floating point number. hex2dec
- Convert hex string to decimal integer. dec2hex - Convert
decimal integer to hex string.
