# D

 d2c [control] [octave/scripts/control/system/d2c.m]
Convert discrete (sub)system to a purely continuous system.
 d2_min [optimization] [octave-forge/main/optim/d2_min.m]
Newton-like minimization
 damp [control] [octave/scripts/control/base/damp.m]
Displays eigenvalues, natural frequencies and damping ratios of the eigenvalues of a matrix P or the A-matrix of a system P, respectively.
 dare [control] [octave/scripts/control/base/dare.m]
Return the solution, X of the discrete-time algebraic Riccati equation
 daspk [calculus] [octave/src/DLD-FUNCTIONS/daspk.cc]
Solve the set of differential-algebraic equations
 daspk_options [calculus]
not implemented
 dasrt [calculus] [octave/src/DLD-FUNCTIONS/dasrt.cc]
Solve the set of differential-algebraic equations
 dasrt_options [calculus]
not implemented
 dassl [calculus] [octave/src/DLD-FUNCTIONS/dassl.cc]
Solve the set of differential-algebraic equations
 dassl_options [calculus]
not implemented
 date [system] [octave/scripts/time/date.m]
Return the date as a character string in the form DD-MMM-YY.
 datenum [system] [octave-forge/main/time/datenum.m]
Returns the specified local time as a day number, with Jan 1, 0000 being day 1.
 datestr [system] [octave-forge/main/time/datestr.m]
Format the given date/time according to the format code'.
 datetick [system] [plotcontrol]
use gset xdata time; gset timefmt "%d/%m"; gset format x "%b %d"
 datevec [system] [octave-forge/main/time/datevec.m]
Breaks the number of days since Jan 1, 0000 into a year-month-day hour-minute-second format.
 dawson [math] [octave-forge/main/gsl/gsl_sf.cc]
The Dawson integral is defined by \\exp(-x^2) \\int_0^x dt \\exp(t^2).
 dbclear [interpreter] [octave/src/debug.cc]
Delete a breakpoint in a function
not implemented
 dbstatus [interpreter] [octave/src/debug.cc]
Return a vector containing the lines on which a function has breakpoints set.
 dbstop [interpreter] [octave/src/debug.cc]
Set a breakpoint in a function
 dbtype [interpreter] [octave/src/debug.cc]
List script file with line numbers.
 dbwhere [interpreter] [octave/src/debug.cc]
Show where we are in the code
 dcgain [control] [octave/scripts/control/base/dcgain.m]
Returns dc-gain matrix.
 dct [signal] [octave-forge/main/signal/dct.m]
Computes the disrete cosine transform of x.
 dct2 [signal] [octave-forge/main/signal/dct2.m]
Computes the 2-D discrete cosine transform of matrix x
 dctmtx [signal] [octave-forge/main/signal/dctmtx.m]
Return the DCT transformation matrix of size n x n.
 ddemod [communications]
not implemented
 ddemodce [communications]
not implemented
 de2bi [communications] [octave-forge/main/comm/de2bi.m]
Convert a non-negative integer to bit vector.
 deal [language] [octave/scripts/general/deal.m]
Copy the input parameters into the corresponding output parameters.
 deblank [strings] [octave/scripts/strings/deblank.m]
Removes the trailing blanks and nulls from the string S.
 debug_on_error [interpreter] [variables] [octave/src/error.cc]
If the value of debug_on_error' is nonzero, Octave will try to enter the debugger when an error is encountered.
 debug_on_interrupt [interpreter] [octave/src/sighandlers.cc]
If debug_on_interrupt' is nonzero, Octave will try to enter debugging mode when it receives an interrupt signal (typically generated with C-c').
 debug_on_warning [interpreter] [variables] [octave/src/error.cc]
If the value of debug_on_warning' is nonzero, Octave will try to enter the debugger when a warning is encountered.
 debug_symtab_lookups [interpreter] [octave/src/symtab.cc]
If the value of this variable is nonzero, print debugging info when searching for symbols in the symbol tables.
 debye_1 [math] [octave-forge/main/gsl/gsl_sf.cc]
The Debye functions are defined by the integral
 debye_2 [math] [octave-forge/main/gsl/gsl_sf.cc]
The Debye functions are defined by the integral
 debye_3 [math] [octave-forge/main/gsl/gsl_sf.cc]
The Debye functions are defined by the integral
 debye_4 [math] [octave-forge/main/gsl/gsl_sf.cc]
The Debye functions are defined by the integral
 dec2base [strings] [octave/scripts/strings/dec2base.m]
Return a string of symbols in base B corresponding to the the nonnegative integer N.
 dec2bin [strings] [octave/scripts/strings/dec2bin.m]
Return a binary number corresponding the nonnegative decimal number N, as a string of ones and zeros.
 dec2hex [strings] [octave/scripts/strings/dec2hex.m]
Return the hexadecimal string corresponding to the nonnegative integer N.
 decimate [signal] [octave-forge/main/signal/decimate.m]
Downsample the signal x by a factor of q, using an order n filter of ftype 'fir' or 'iir'.
 decode [communications] [octave-forge/main/comm/decode.m]
Top level block decoder.
 deconv [analysis] [octave/scripts/polynomial/deconv.m]
Deconvolve two vectors.
 DEFAULT_EXEC_PATH [variables] [octave/src/defaults.cc]
A colon separated list of directories in which to search when executing external programs.
A colon separated list of directories in which to search for function files.
ascii
Converts angles input in degrees to the equivalent in radians.
 degree [symbolic] [octave-forge/main/symbolic/symbols.cc]
degree
 del2 [calculus] [octave-forge/main/general/del2.m]
D = del2 (M) calculates the Laplace Operator
 delaunay [analysis] [octave-forge/main/geometry/delaunay.m]
The return matrix of size [n, 3] contains a set triangles which are described by the indices to the data point x and y vector.
 delaunay3 [analysis] [octave-forge/main/geometry/delaunay3.m]
A matrix of size [n, 4] is returned.
 delaunayn [analysis] [octave-forge/main/geometry/delaunayn.cc]
Form the Delaunay triangulation for a set of points.
 delete [interpreter] [octave/scripts/miscellaneous/delete.m]
Delete the named file.
 demo [interpreter] [interpreter] [octave-forge/extra/testfun/demo.m]
Runs any examples associated with the function 'name'.
 DEMOcontrol [control] [octave/scripts/control/base/DEMOcontrol.m]
Octave Control Systems Toolbox demo/tutorial program.
 demodmap [communications] [octave-forge/main/comm/demodmap.m]
Demapping of an analog signal to a digital signal.
 demoquat [analysis] [octave/scripts/quaternion/demoquat.m]
Demonstrate the functions available for manipulating quaternions.
 deref [language] [octave-forge/main/general/deref.cc]
Return the N-th element of CELL.
 deriv [optimization] [octave-forge/main/optim/deriv.m]
no description
 det [matrix] [octave/src/DLD-FUNCTIONS/det.cc]
Compute the determinant of A using LAPACK.
 detrend [extra] [tsa] [analysis] [octave/scripts/signal/detrend.m]
If X is a vector, detrend (X, P)' removes the best fit of a polynomial of order P from the data X.
 dezero [control] [octave/scripts/control/obsolete/dezero.m]
Remove trailing blank entries and all zero entries from the string s.
 dfdp [optimization] [octave-forge/main/optim/dfdp.m]
numerical partial derivatives (Jacobian) df/dp for use with leasqr
 dftmtx [signal] [octave-forge/main/signal/dftmtx.m]
If N is a scalar, produces a N-by-N matrix D such that the Fourier transform of a column vector of length N is given by dftmtx(N) * x' and the inverse Fourier transform is given by inv(dftmtx(N)) * x'.
 dgkfdemo [control] [control] [octave/scripts/control/hinf/dgkfdemo.m]
Octave Controls toolbox demo: H2/Hinfinity options demos
 dgram [control] [octave/scripts/control/base/dgram.m]
Return controllability grammian of discrete time system
 dhbar [plot] [octave-forge/main/plot/dhbar.m]
create Bar graph
 dhinfdemo [control] [control] [octave/scripts/control/hinf/dhinfdemo.m]
Demonstrate the functions available for designining a discrete H_infinity controller.
 diag [matrix] [octave/src/data.cc]
Return a diagonal matrix with vector V on diagonal K.
 diary [interpreter] [octave/src/pager.cc]
Create a list of all commands _and_ the output they produce, mixed together just as you see them on your terminal.
 diff [calculus] [octave/scripts/general/diff.m]
If X is a vector of length N, diff (X)' is the vector of first differences X(2) - X(1), ..., X(n) - X(n-1).
 differentiate [symbolic] [octave-forge/main/symbolic/differentiate.cc]
Return the Nth derivative of A with respect to X.
 diffpara [signal] [octave/scripts/signal/diffpara.m]
Return the estimator D for the differencing parameter of an integrated time series.
 digits [symbolic] [octave-forge/main/symbolic/symbols.cc]
Change the precision for the vpa type
 dilate [image] [octave-forge/main/image/dilate.m]
Perform a dilation morphological operation on a binary image.
 dir [interpreter] [file] [octave/scripts/miscellaneous/dir.m]
Display file listing for directory DIRECTORY.
 diric [signal]
not implemented
 discrete_cdf [statistics] [octave/scripts/statistics/distributions/discrete_cdf.m]
For each element of X, compute the cumulative distribution function (CDF) at X of a univariate discrete distribution which assumes the values in v with probabilities P.
 discrete_inv [statistics] [octave/scripts/statistics/distributions/discrete_inv.m]
For each component of X, compute the quantile (the inverse of the CDF) at X of the univariate distribution which assumes the values in V with probabilities P.
 discrete_pdf [statistics] [octave/scripts/statistics/distributions/discrete_pdf.m]
For each element of X, compute the probability density function (pDF) at X of a univariate discrete distribution which assumes the values in V with probabilities P.
 discrete_rnd [statistics] [octave/scripts/statistics/distributions/discrete_rnd.m]
Generate a row vector containing a random sample of size N from the univariate distribution which assumes the values in V with probabilities P.
 disp [language] [octave/src/pr-output.cc]
Display the value of X.
 dispatch [interpreter] [octave-forge/main/miscellaneous/dispatch.cc]
Replaces the function 'f' with a dispatch so that function 'r'
 display_fixed_operations [Fixedpoint] [octave-forge/main/fixed/fixed.cc]
Displays out a summary of the number of fixed point operations of each type that have been used.
 distance [math] [octave-forge/extra/mapping/distance.m]
Calculates the distance (in degrees) between PT1 and PT2.
 dither [image]
not implemented
 dkalman [control] [octave/scripts/control/base/dkalman.m]
Construct the linear quadratic estimator (Kalman predictor) for the discrete time system
Read the matrix x from a file, with columns separated by the character sep (default is ",").
 dlmwrite [file] [octave-forge/main/io/dlmwrite.m]
write matrix to the file using delimiters (defaults to ",")
 dlqe [control] [octave/scripts/control/base/dlqe.m]
Construct the linear quadratic estimator (Kalman filter) for the discrete time system
 dlqg [control] [octave/scripts/control/obsolete/dlqg.m]
O B S O L E T E * * * D O N O T U S E!
 dlqr [control] [octave/scripts/control/base/dlqr.m]
Construct the linear quadratic regulator for the discrete time system
 dlyap [control] [octave/scripts/control/base/dlyap.m]
Solve the discrete-time Lyapunov equation
 dmod [communications]
not implemented
 dmodce [communications]
not implemented
 dmr2d [control] [octave/scripts/control/system/dmr2d.m]
convert a multirate digital system to a single rate digital system states specified by IDX, SPREFIX are sampled at TS2, all others are assumed sampled at TS1 = sysgettsam (SYS)'.
 dmult [matrix] [octave/scripts/linear-algebra/dmult.m]
If A is a vector of length rows (B)', return diag (A) * B' (but computed much more efficiently).
 document [interpreter] [octave/src/variables.cc]
Set the documentation string for SYMBOL to TEXT.
 dos [interpreter] [octave-forge/main/general/dos.m]
Execute a dos command if running under Windows.
 dot [matrix] [octave/scripts/linear-algebra/dot.m]
Computes the dot product of two vectors.
 double [strings] [octave-forge/main/general/double.m]
Convert the characters of a string into its representation as a matrix of ascii codes.
 do_string_escapes [strings] [octave/src/utils.cc]
Convert special characters in STRING to their escaped forms.
 dpcmdeco [communications]
not implemented
 dpcmenco [communications]
not implemented
 dpcmopt [communications]
not implemented
 dragrect [plotcontrol]
not implemented
 drawnow [plotcontrol] [octave-forge/main/plot/drawnow.m]
This program intensionally left blank
 dre [control] [octave/scripts/control/base/dre.m]
Solve the differential Riccati equation
 dsearch [analysis]
not implemented
 dsearchn [analysis]
not implemented
 dump_prefs [interpreter] [octave/scripts/miscellaneous/dump_prefs.m]
Have Octave dump all the current user preference variables to FILE in a format that can be parsed by Octave later.
 dup2 [file] [octave/src/syscalls.cc]
Duplicate a file descriptor.
 duplication_matrix [matrix] [octave/scripts/linear-algebra/duplication_matrix.m]
Return the duplication matrix Dn which is the unique n^2 by n*(n+1)/2 matrix such that Dn vech (A) = vec (A) for all symmetric n by n matrices A.
 durbinlevinson [signal] [octave/scripts/signal/durbinlevinson.m]
Perform one step of the Durbin-Levinson algorithm.
 durlev [tsa] [octave-forge/extra/tsa/durlev.m]
estimates AR(p) model parameter by solving the
 dxfwrite [plotcontrol] [octave-forge/main/plot/dxfwrite.m]
Write FILENAME as a DXF file.