MATLAB Function Reference Volume 1: A - E - Bad Request

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detrend 2detrend Purpose Remove linear trends. Syntax y = detrend(x) y = detrend(x,'constant') y = detrend(x,'linear',bp) Description detrend removes the mean value or linear trend from a vector or matrix, usually for FFT processing. 2-436 y = detrend(x) removes the best straight-line fit from vector x and returns it in y. If x is a matrix, detrend removes the trend from each column. y = detrend(x,'constant') removes the mean value from vector x or, if x is a matrix, from each column of the matrix. y = detrend(x,'linear',bp) removes a continuous, piecewise linear trend from vector x or, if x is a matrix, from each column of the matrix. Vector bp contains the indices of the breakpoints between adjacent linear segments. The breakpoint between two segments is defined as the data point that the two segments share. breakpoints detrend(x,'linear'), with no breakpoint vector specified, is the same as detrend(x). Example sig = [0 1 -2 1 0 1 -2 1 0]; % signal with no linear trend trend = [0 1 2 3 4 3 2 1 0]; % two-segment linear trend x = sig+trend; % signal with added trend y = detrend(x,'linear',5) % breakpoint at 5th element
y = -0.0000 1.0000 -2.0000 1.0000 0.0000 1.0000 -2.0000 1.0000 -0.0000 detrend Note that the breakpoint is specified to be the fifth element, which is the data point shared by the two segments. Algorithm detrend computes the least-squares fit of a straight line (or composite line for piecewise linear trends) to the data and subtracts the resulting function from the data. To obtain the equation of the straight-line fit, use polyfit. See Also polyfit 2-437
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MATLAB® MATLAB Function Reference
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1 Functions By Category Development
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Functions By Category 1
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Development Environment Development
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ls List directory on UNIX matlabroo
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Mathematics Mathematics Functions f
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Slash or right matrix divide ' Tran
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Matrix Analysis cond Condition numb
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atan, atanh Inverse tangent and inv
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Correlation corrcoef Correlation co
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Convex Hull convhull Convex hull co
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etainc Incomplete beta function bet
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Tree Operations etree Elimination t
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permute Rearrange dimensions of mul
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int8 Convert to signed 8-bit intege
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Array Manipulation : Specify range
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itxor Bit-wise XOR Relational Opera
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evalc Evaluate MATLAB expression wi
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methodsview Display information on
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open Open files of various types us
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Microsoft WAVE Sound Functions wavp
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gtext Place text on 2-D graph using
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tsearch Search for enclosing Delaun
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3-D Visualization 3-D Visualization
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• Selecting Region of Interest Co
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Creating Graphical User Interfaces
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Controlling Program Execution uires
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Alphabetical List of Functions 2
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axis . . . . . . . . . . . . . . .
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clear . . . . . . . . . . . . . . .
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dbup . . . . . . . . . . . . . . .
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expm . . . . . . . . . . . . . . .
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Arithmetic Operators + - * / \ ^ '
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See Also all, any, find, strcmp Rel
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Logical Operators & | ~ expression
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Special Characters [ ] ( ) {} = ' .
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2Colon : Purpose Create vectors, ar
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2abs Purpose Absolute value and com
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Algorithm acos and acosh use these
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Algorithm acot and acoth use these
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See Also csc, csch acsc, acsch 2-33
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actxcontrol Note There are two ways
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actxserver 2actxserver Purpose Crea
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fig=figure; set(fig,'DoubleBuffer',
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Verify that the files were added to
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[W,ierr] = airy(k,Z) also returns a
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2all Purpose Test to determine if a
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2allchild Purpose Find all children
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• 'rand' - set the AlphaData prop
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2alphamap Purpose Specify the figur
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2angle Purpose Phase angle Syntax P
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2any Purpose Test for any nonzeros
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2area Purpose Area fill of a two-di
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2asec, asech Purpose Inverse secant
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2asin, asinh Purpose Inverse sine a
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2assignin Purpose Assign a value to
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2atan, atanh Purpose Inverse tangen
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2atan2 Purpose Four-quadrant invers
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2audioplayer Purpose Create an audi
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Property Description Type Type Name
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Method Description audiorecorder is
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audiorecorder Examples Example 1 Us
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2auwrite Purpose Write NeXT/SUN (.a
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Parameter Value Default You can als
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2aviinfo Purpose Return information
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2aviread Purpose Read an Audio Vide
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While the basic purpose of an axes
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In this example, the first plot occ
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Property Name Property Description
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Axes Properties objects in the axes
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CameraView Angle [0 1 0] (positive
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Color {none} | ColorSpec Axes Prope
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X-, Y-, Z-Limits following table de
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Axes Properties FontName A name suc
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Axes Properties When a handle’s v
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Axes Properties • replacechildren
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Axes Properties define object handl
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Visible {on} | off Axes Properties
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XMinorGrid, YMinorGrid, ZMinorGrido
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2axis Purpose Axis scaling and appe
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Examples The statements axis off tu
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5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 axis(
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2balance Purpose Improve accuracy o
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Now the eigenvectors are well behav
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ar, barh distinct elements and show
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See Also bar3, ColorSpec, patch, st
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ar3, bar3h •'stacked' displays on
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See Also bar, LineSpec, patch 1 0.5
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2beep Purpose Produce a beep sound
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[H,ierr] = besselh(...) also return
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esseli, besselk and the other is a
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2besselj, bessely Purpose Bessel fu
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0.19602657795532 0.28670098806392 0
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1/168 1/252 1/360 1/495 1/660 In th
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Examples Example 1. bicg(afun,b,tol
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flag = relres = iter = 1 1 0 The va
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4559 This time U2 is nonsingular an
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time to precondition and converge t
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Example Example 1. bicgstab bicgsta
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icgstab flag2 is 0 because bicgstab
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2bin2dec Purpose Binary to decimal
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2bitcmp Purpose Complement bits Syn
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2bitmax Purpose Maximum floating-po
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2bitset Purpose Set bit Syntax C =
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2bitxor Purpose Bit-wise XOR Syntax
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2blkdiag Purpose Construct a block
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2break Purpose Terminate execution
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2builtin Purpose Execute builtin fu
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parameters Optional. A vector that
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function dydx = twoode(x,y) dydx =
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fprintf('The fourth eigenvalue is a
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2bvpget Purpose Extract properties
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solinit is a structure with the fol
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Property Value Description Vectoriz
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2calendar Purpose Calendar Syntax c
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camdolly Remarks camdolly sets the
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Examples This example creates a lig
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See Also campos, camtarget camlooka
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end camorbit Rotation in the camera
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2campos Purpose Set or query the ca
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2camproj Purpose Set or query the p
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2camtarget Purpose Set or query the
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2camup Purpose Set or query the cam
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2camva Purpose Set or query the cam
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2camzoom Purpose Zoom in and out on
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2cart2pol Purpose Transform Cartesi
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2case Purpose Case switch Descripti
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2catch Purpose Begin catch block De
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each time they render. CData values
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The blue color of the ocean is the
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2cdf2rdf Purpose Convert complex di
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2cdfinfo Purpose Return details abo
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Column 5 - Record and Dimension Var
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Examples Read all of the data from
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2cell Purpose Create cell array Syn
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2cell2struct Purpose Convert cell a
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2cellfun Purpose Apply a function t
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2cellplot Purpose Graphically displ
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2cgs Purpose Conjugate Gradients Sq
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Alternatively, use this matrix-vect
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2char Purpose Create character arra
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2checkin Purpose Check file into so
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2checkout Purpose Check file out of
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Example 2 - Check out Multiple File
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Destroy the positive definiteness (
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cholinc michol stands for modified
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0 20 40 60 80 100 120 140 0 50 nz =
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cholinc For hilb(20), the Cholesky
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2cholupdate Purpose Rank 1 update t
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Compare chol with cholupdate: R1 =
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2clabel Purpose Contour plot elevat
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2class Purpose Create object or ret
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2clc Purpose Clear Command Window G
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clear keyword clears the items indi
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To clear all compiled M- and MEX-fu
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2clf Purpose Clear current figure w
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2clock Purpose Current time as a da
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See Also delete, figure, gcf must s
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2closereq Purpose Default figure cl
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2colamd Purpose Column approximate
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2colmmd Purpose Sparse column minim
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See Also colamd, colperm, lu, sppar
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colorbar See Also colormap 10 8 6 4
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2colormap Purpose Set and get the c
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The rgbplot function plots colormap
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2ColorSpec Purpose Color specificat
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2colperm Purpose Sparse column perm
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2comet3 Purpose Three-dimensional c
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2compass Purpose Plot arrows emanat
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2complex Purpose Construct complex
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2computer Purpose Identify informat
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2cond Purpose Condition number with
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2condest Purpose 1-norm condition n
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coneplot(...,'method') specifies th
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3. Add the Slice Planes coneplot
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2conj Purpose Complex conjugate Syn
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2contour Purpose Two-dimensional co
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3 2.5 2 1.5 1 0.5 0 −0.5 −1 −
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2contour3 Purpose Three-dimensional
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2contourc Purpose Low-level contour
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2contourf Purpose Filled two-dimens
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2contourslice Purpose Draw contours
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3 2 1 0 −1 −2 −3 3 2 1 0 −1
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2conv Purpose Convolution and polyn
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In practice however, conv2 computes
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4 2 0 −2 −4 15 This figure comb
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2convhull Purpose Convex hull Synta
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2convhulln Purpose n-D convex hull
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2convn Purpose N-dimensional convol
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2copyobj Purpose Copy graphics obje
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2corrcoef Purpose Correlation coeff
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Algorithm cos and cosh use these al
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Algorithm cot and coth use these al
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2cplxpair Purpose Sort complex numb
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2cross Purpose Vector cross product
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Algorithm csc and csch use these al
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5 10 15 20 25 30 7 14 21 28 35 42 1
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2cumprod Purpose Cumulative product
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2cumtrapz Purpose Cumulative trapez
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2curl Purpose Computes the curl and
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See Also streamribbon, divergence c
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2cylinder Purpose Generate cylinder
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See Also sphere, surf 1 0.8 0.6 0.4
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daspect the window). This means set
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2date Purpose Current date string S
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Examples Convert a date string to a
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dateform (number) dateform (string)
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2datetick Purpose Label tick lines
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datetick('x',11) % Replace x-axis t
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ans = See Also clock, datenum, date
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See Also dbcont, dbdown, dbquit, db
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2dbdown Purpose Change local worksp
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dblquad The integrnd function integ
Page 439 and 440: 2dbquit Purpose Quit debug mode Gra
Page 441 and 442: 2dbstatus Purpose List all breakpoi
Page 443 and 444: 2dbstop Purpose Set breakpoints in
Page 445 and 446: Examples The file buggy, used in th
Page 447 and 448: 2dbtype Purpose List M-file with li
Page 449 and 450: 2ddeadv Purpose Set up advisory lin
Page 451 and 452: 2ddeexec Purpose Send string for ex
Page 453 and 454: 2ddepoke Purpose Send data to appli
Page 455 and 456: 2ddereq Purpose Request data from a
Page 457 and 458: 2ddeterm Purpose Terminate DDE conv
Page 459 and 460: 2deal Purpose Deal inputs to output
Page 461 and 462: 2deblank Purpose Strip trailing bla
Page 463 and 464: 2dec2bin Purpose Decimal to binary
Page 465 and 466: 2deconv Purpose Deconvolution and p
Page 467 and 468: 2del2 Purpose Discrete Laplacian Sy
Page 469 and 470: See Also diff, gradient V = 4*del2(
Page 471 and 472: Visualization Use one of these func
Page 473 and 474: 1 0.5 0 −0.5 −1 15 delaunay Nex
Page 475 and 476: 2delaunay3 Purpose 3-D Delaunay tes
Page 477 and 478: delaunay3 [2] National Science and
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Page 481 and 482: 2delete Purpose Delete files or gra
Page 483 and 484: 2delete (serial) Purpose Remove a s
Page 485 and 486: 2depfun Purpose List the dependent
Page 487 and 488: depfun not examine the files on whi
Page 489: 2det Purpose Matrix determinant Syn
Page 493 and 494: 2diag Purpose Diagonal matrices and
Page 495 and 496: 2dialog Purpose Create and display
Page 497 and 498: 2diff Purpose Differences and appro
Page 499 and 500: 2dir Purpose Display directory list
Page 501 and 502: 2disp Purpose Display text or array
Page 503 and 504: 2display Purpose Overloaded method
Page 505 and 506: 2divergence Purpose Computes the di
Page 507 and 508: 2dlmread Purpose Read an ASCII deli
Page 509 and 510: 2dmperm Purpose Dulmage-Mendelsohn
Page 511 and 512: 2docopt Purpose Display location of
Page 513 and 514: To open the notepad editor and retu
Page 515 and 516: 2double Purpose Convert to double-p
Page 517 and 518: 2drawnow Purpose Complete pending d
Page 519 and 520: 2dsearchn Purpose n-D nearest point
Page 521 and 522: 2edit Purpose Edit or create M-file
Page 523 and 524: 2eig Purpose Find eigenvalues and e
Page 525 and 526: Examples The matrix eigenvalues, it
Page 527 and 528: 2eigs Purpose Find a few eigenvalue
Page 529 and 530: eigs(A,K,sigma,opts) and eigs(A,B,k
Page 531 and 532: [dum,ind] = sort(abs(d)); plot(dlm,
Page 533 and 534: (lambda - 4.0), where lambda is an
Page 535 and 536: 2ellipj Purpose Jacobi elliptic fun
Page 537 and 538: 2ellipke Purpose Complete elliptic
Page 539 and 540: 2ellipsoid Purpose Generate ellipso
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2elseif Purpose Conditionally execu
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2end Purpose Terminate for, while,
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2eomday Purpose End of month Syntax
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2erf, erfc, erfcx, erfinv, erfcinv
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2error Purpose Display error messag
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errorbar(X,Y,E) 1.4 See Also LineSp
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displays this dialog box on a UNIX
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2etree Purpose Elimination tree Syn
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2eval Purpose Execute a string cont
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2evalc Purpose Evaluate MATLAB expr
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Limitation evalin cannot be used re
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If item is a Java class, then exist
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2exit Purpose Terminate MATLAB (sam
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2expint Purpose Exponential integra
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expm Notice that the diagonal eleme
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2ezcontour Purpose Easy to use cont
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ezcontour See Also contour, ezconto
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f( x, y) 31 ( - x) 2e x2 - ( y + 1)
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2ezmesh Purpose Easy to use 3-D mes
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2ezmeshc Purpose Easy to use combin
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2ezplot Purpose Easy to use functio
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2ezplot3 Purpose Easy to use 3-D pa
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2ezpolar Purpose Easy to use polar
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sqrt(x.^2 + y.^2); is written as: e
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2ezsurfc Purpose Easy to use combin
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See Also ezcontour, ezcontourf, ezm
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Symbols ! 2-22 - 2-10 % 2-22 & 2-20
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eta function (defined) 2-144 incomp
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colamd 2-277 colmmd 2-279 Color Axe
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dbclear 2-378 dbcont 2-380 dbdown 2
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ellipj 2-481 ellipke 2-483 elliptic
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help files, location for UNIX 2-457
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mldivide (M-file function equivalen
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sound files reading 2-76 writing 2-
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ZGrid, Axes property 2-114 ZLim, Ax
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