Mercurial > octave
view libinterp/corefcn/filter.cc @ 22407:34ce5be04942
maint: Style check C++ code in libinterp/.
* build-env.h, build-env.in.cc, builtins.h, Cell.cc, Cell.h, __contourc__.cc,
__dispatch__.cc, __dsearchn__.cc, __ilu__.cc, __lin_interpn__.cc, __luinc__.cc,
__magick_read__.cc, __pchip_deriv__.cc, __qp__.cc, balance.cc,
base-text-renderer.h, besselj.cc, bitfcns.cc, bsxfun.cc, c-file-ptr-stream.cc,
c-file-ptr-stream.h, call-stack.cc, call-stack.h, cdisplay.c, cdisplay.h,
cellfun.cc, coct-hdf5-types.c, comment-list.cc, comment-list.h, conv2.cc,
daspk.cc, dasrt.cc, dassl.cc, data.cc, data.h, debug.cc, debug.h, defaults.cc,
defaults.in.h, defun-dld.h, defun-int.h, defun.h, det.cc, dirfns.cc, dirfns.h,
display.cc, display.h, dlmread.cc, dynamic-ld.cc, dynamic-ld.h, eig.cc,
error.cc, error.h, errwarn.h, event-queue.cc, event-queue.h, fft.cc, fft2.cc,
fftn.cc, file-io.cc, file-io.h, filter.cc, find.cc, ft-text-renderer.cc,
ft-text-renderer.h, gammainc.cc, gcd.cc, getgrent.cc, getpwent.cc, givens.cc,
gl-render.cc, gl-render.h, gl2ps-print.cc, gl2ps-print.h, graphics.cc,
graphics.in.h, gripes.h, gsvd.cc, hash.cc, help.cc, help.h, hess.cc,
hex2num.cc, hook-fcn.cc, hook-fcn.h, input.cc, input.h, interpreter.cc,
interpreter.h, inv.cc, jit-ir.cc, jit-ir.h, jit-typeinfo.cc, jit-typeinfo.h,
jit-util.cc, jit-util.h, kron.cc, load-path.cc, load-path.h, load-save.cc,
load-save.h, lookup.cc, ls-ascii-helper.cc, ls-ascii-helper.h, ls-hdf5.cc,
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ls-oct-binary.cc, ls-oct-binary.h, ls-oct-text.cc, ls-oct-text.h, ls-utils.cc,
ls-utils.h, lsode.cc, lu.cc, matrix_type.cc, max.cc, mex.cc, mex.h, mexproto.h,
mgorth.cc, mxarray.in.h, nproc.cc, oct-errno.h, oct-errno.in.cc, oct-fstrm.cc,
oct-fstrm.h, oct-handle.h, oct-hdf5-types.cc, oct-hdf5-types.h, oct-hdf5.h,
oct-hist.cc, oct-hist.h, oct-iostrm.cc, oct-iostrm.h, oct-lvalue.cc,
oct-lvalue.h, oct-map.h, oct-obj.h, oct-opengl.h, oct-prcstrm.cc,
oct-prcstrm.h, oct-procbuf.cc, oct-procbuf.h, oct-stdstrm.h, oct-stream.cc,
oct-stream.h, oct-strstrm.cc, oct-strstrm.h, oct.h, octave-default-image.h,
octave-link.h, octave-preserve-stream-state.h, ordschur.cc, pager.cc, pager.h,
pinv.cc, pr-output.cc, pr-output.h, procstream.cc, procstream.h, profiler.h,
psi.cc, pt-jit.cc, pt-jit.h, quad.cc, quadcc.cc, qz.cc, rand.cc, rcond.cc,
regexp.cc, schur.cc, sighandlers.cc, sighandlers.h, sparse-xdiv.cc,
sparse-xdiv.h, sparse-xpow.cc, sparse-xpow.h, sparse.cc, spparms.cc, sqrtm.cc,
str2double.cc, strfind.cc, strfns.cc, sub2ind.cc, svd.cc, sylvester.cc,
symtab.cc, symtab.h, syscalls.cc, sysdep.cc, sysdep.h, text-renderer.cc,
text-renderer.h, time.cc, toplev.cc, toplev.h, tril.cc, tsearch.cc, txt-eng.cc,
txt-eng.h, typecast.cc, urlwrite.cc, utils.cc, utils.h, variables.cc,
variables.h, workspace-element.h, xdiv.cc, xdiv.h, xnorm.cc, xnorm.h, xpow.cc,
xpow.h, zfstream.cc, zfstream.h, deprecated-config.h, __delaunayn__.cc,
__eigs__.cc, __fltk_uigetfile__.cc, __glpk__.cc, __init_fltk__.cc,
__init_gnuplot__.cc, __osmesa_print__.cc, __voronoi__.cc, amd.cc,
audiodevinfo.cc, audioread.cc, ccolamd.cc, chol.cc, colamd.cc, convhulln.cc,
dmperm.cc, fftw.cc, gzip.cc, oct-qhull.h, qr.cc, symbfact.cc, symrcm.cc,
liboctinterp-build-info.h, liboctinterp-build-info.in.cc, ov-base-diag.h,
ov-base-int.cc, ov-base-int.h, ov-base-mat.cc, ov-base-mat.h, ov-base-scalar.h,
ov-base-sparse.cc, ov-base-sparse.h, ov-base.cc, ov-base.h, ov-bool-mat.cc,
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ov-builtin.cc, ov-builtin.h, ov-cell.cc, ov-cell.h, ov-ch-mat.cc, ov-ch-mat.h,
ov-class.cc, ov-class.h, ov-classdef.cc, ov-classdef.h, ov-colon.cc,
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ov-dld-fcn.cc, ov-dld-fcn.h, ov-fcn-handle.cc, ov-fcn-handle.h,
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ov-int8.cc, ov-int8.h, ov-intx.h, ov-java.cc, ov-java.h, ov-lazy-idx.cc,
ov-lazy-idx.h, ov-mex-fcn.cc, ov-mex-fcn.h, ov-null-mat.cc, ov-null-mat.h,
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ovl.cc, ovl.h, octave.cc, octave.h, op-b-b.cc, op-b-bm.cc, op-b-sbm.cc,
op-bm-b.cc, op-bm-bm.cc, op-bm-sbm.cc, op-cdm-cdm.cc, op-cell.cc, op-chm.cc,
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op-dm-template.cc, op-dms-template.cc, op-fcdm-fcdm.cc, op-fcm-fcm.cc,
op-fcm-fcs.cc, op-fcm-fm.cc, op-fcm-fs.cc, op-fcm-pm.cc, op-fcn.cc,
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op-fs-fcm.cc, op-fs-fcs.cc, op-fs-fm.cc, op-fs-fs.cc, op-i16-i16.cc,
op-i32-i32.cc, op-i64-i64.cc, op-i8-i8.cc, op-int-concat.cc, op-int.h,
op-m-cm.cc, op-m-cs.cc, op-m-m.cc, op-m-pm.cc, op-m-s.cc, op-m-scm.cc,
op-m-sm.cc, op-pm-cm.cc, op-pm-fcm.cc, op-pm-fm.cc, op-pm-m.cc, op-pm-pm.cc,
op-pm-scm.cc, op-pm-sm.cc, op-pm-template.cc, op-range.cc, op-s-cm.cc,
op-s-cs.cc, op-s-m.cc, op-s-s.cc, op-s-scm.cc, op-s-sm.cc, op-sbm-b.cc,
op-sbm-bm.cc, op-sbm-sbm.cc, op-scm-cm.cc, op-scm-cs.cc, op-scm-m.cc,
op-scm-s.cc, op-scm-scm.cc, op-scm-sm.cc, op-sm-cm.cc, op-sm-cs.cc, op-sm-m.cc,
op-sm-s.cc, op-sm-scm.cc, op-sm-sm.cc, op-str-m.cc, op-str-s.cc, op-str-str.cc,
op-struct.cc, op-ui16-ui16.cc, op-ui32-ui32.cc, op-ui64-ui64.cc, op-ui8-ui8.cc,
ops.h, options-usage.h, lex.h, parse.h, pt-all.h, pt-arg-list.cc,
pt-arg-list.h, pt-array-list.h, pt-assign.cc, pt-assign.h, pt-binop.cc,
pt-binop.h, pt-bp.cc, pt-bp.h, pt-cbinop.cc, pt-cbinop.h, pt-cell.cc,
pt-cell.h, pt-check.cc, pt-check.h, pt-classdef.cc, pt-classdef.h, pt-cmd.cc,
pt-cmd.h, pt-colon.cc, pt-colon.h, pt-const.cc, pt-const.h, pt-decl.cc,
pt-decl.h, pt-eval.cc, pt-eval.h, pt-except.cc, pt-except.h, pt-exp.cc,
pt-exp.h, pt-fcn-handle.cc, pt-fcn-handle.h, pt-funcall.cc, pt-funcall.h,
pt-id.cc, pt-id.h, pt-idx.cc, pt-idx.h, pt-jump.cc, pt-jump.h, pt-loop.cc,
pt-loop.h, pt-mat.cc, pt-mat.h, pt-misc.cc, pt-misc.h, pt-pr-code.cc,
pt-pr-code.h, pt-select.cc, pt-select.h, pt-stmt.cc, pt-stmt.h, pt-unop.cc,
pt-unop.h, pt-walk.h, pt.cc, pt.h, token.cc, token.h, Array-jit.cc,
Array-tc.cc, version.cc, version.in.h:
Style check C++ code in libinterp/
author | Rik <rik@octave.org> |
---|---|
date | Tue, 30 Aug 2016 21:46:47 -0700 |
parents | bac0d6f07a3e |
children | 7abc25e6206a e9a0469dedd9 |
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/* Copyright (C) 1996-2016 John W. Eaton This file is part of Octave. Octave is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. Octave is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Octave; see the file COPYING. If not, see <http://www.gnu.org/licenses/>. */ // Based on Tony Richardson's filter.m. // // Originally translated to C++ by KH (Kurt.Hornik@wu-wien.ac.at) // with help from Fritz Leisch and Andreas Weingessel on Oct 20, 1994. // // Rewritten to use templates to handle both real and complex cases by // jwe, Wed Nov 1 19:15:29 1995. #if defined (HAVE_CONFIG_H) # include "config.h" #endif #include "quit.h" #include "defun.h" #include "error.h" #include "ovl.h" template <typename T> MArray<T> filter (MArray<T>& b, MArray<T>& a, MArray<T>& x, MArray<T>& si, int dim = 0) { MArray<T> y; octave_idx_type a_len = a.numel (); octave_idx_type b_len = b.numel (); octave_idx_type ab_len = a_len > b_len ? a_len : b_len; // FIXME: The two lines below should be unecessary because // this template is called with a and b as column vectors // already. However the a.resize line is currently (2011/04/26) // necessary to stop bug #33164. b.resize (dim_vector (ab_len, 1), 0.0); if (a_len > 1) a.resize (dim_vector (ab_len, 1), 0.0); T norm = a (0); if (norm == static_cast<T> (0.0)) error ("filter: the first element of A must be nonzero"); dim_vector x_dims = x.dims (); if (dim < 0 || dim > x_dims.ndims ()) error ("filter: DIM must be a valid dimension"); octave_idx_type x_len = x_dims(dim); dim_vector si_dims = si.dims (); octave_idx_type si_len = si_dims(0); if (si_len != ab_len - 1) error ("filter: first dimension of SI must be of length max (length (a), length (b)) - 1"); if (si_dims.ndims () != x_dims.ndims ()) error ("filter: dimensionality of SI and X must agree"); for (octave_idx_type i = 1; i < dim; i++) { if (si_dims(i) != x_dims(i-1)) error ("filter: dimensionality of SI and X must agree"); } for (octave_idx_type i = dim+1; i < x_dims.ndims (); i++) { if (si_dims(i) != x_dims(i)) error ("filter: dimensionality of SI and X must agree"); } if (x_len == 0) return x; if (norm != static_cast<T> (1.0)) { a /= norm; b /= norm; } if (a_len <= 1 && si_len <= 0) return b(0) * x; y.resize (x_dims, 0.0); octave_idx_type x_stride = 1; for (int i = 0; i < dim; i++) x_stride *= x_dims(i); octave_idx_type x_num = x_dims.numel () / x_len; for (octave_idx_type num = 0; num < x_num; num++) { octave_idx_type x_offset; if (x_stride == 1) x_offset = num * x_len; else { octave_idx_type x_offset2 = 0; x_offset = num; while (x_offset >= x_stride) { x_offset -= x_stride; x_offset2++; } x_offset += x_offset2 * x_stride * x_len; } octave_idx_type si_offset = num * si_len; if (a_len > 1) { T *py = y.fortran_vec (); T *psi = si.fortran_vec (); const T *pa = a.data (); const T *pb = b.data (); const T *px = x.data (); psi += si_offset; for (octave_idx_type i = 0, idx = x_offset; i < x_len; i++, idx += x_stride) { py[idx] = psi[0] + pb[0] * px[idx]; if (si_len > 0) { for (octave_idx_type j = 0; j < si_len - 1; j++) { OCTAVE_QUIT; psi[j] = psi[j+1] - pa[j+1] * py[idx] + pb[j+1] * px[idx]; } psi[si_len-1] = pb[si_len] * px[idx] - pa[si_len] * py[idx]; } else { OCTAVE_QUIT; psi[0] = pb[si_len] * px[idx] - pa[si_len] * py[idx]; } } } else if (si_len > 0) { T *py = y.fortran_vec (); T *psi = si.fortran_vec (); const T *pb = b.data (); const T *px = x.data (); psi += si_offset; for (octave_idx_type i = 0, idx = x_offset; i < x_len; i++, idx += x_stride) { py[idx] = psi[0] + pb[0] * px[idx]; if (si_len > 1) { for (octave_idx_type j = 0; j < si_len - 1; j++) { OCTAVE_QUIT; psi[j] = psi[j+1] + pb[j+1] * px[idx]; } psi[si_len-1] = pb[si_len] * px[idx]; } else { OCTAVE_QUIT; psi[0] = pb[1] * px[idx]; } } } } return y; } template <typename T> MArray<T> filter (MArray<T>& b, MArray<T>& a, MArray<T>& x, int dim = -1) { dim_vector x_dims = x.dims (); if (dim < 0) dim = x_dims.first_non_singleton (); else if (dim > x_dims.ndims ()) error ("filter: DIM must be a valid dimension"); octave_idx_type a_len = a.numel (); octave_idx_type b_len = b.numel (); octave_idx_type si_len = (a_len > b_len ? a_len : b_len) - 1; dim_vector si_dims = x.dims (); for (int i = dim; i > 0; i--) si_dims(i) = si_dims(i-1); si_dims(0) = si_len; MArray<T> si (si_dims, T (0.0)); return filter (b, a, x, si, dim); } DEFUN (filter, args, , doc: /* -*- texinfo -*- @deftypefn {} {@var{y} =} filter (@var{b}, @var{a}, @var{x}) @deftypefnx {} {[@var{y}, @var{sf}] =} filter (@var{b}, @var{a}, @var{x}, @var{si}) @deftypefnx {} {[@var{y}, @var{sf}] =} filter (@var{b}, @var{a}, @var{x}, [], @var{dim}) @deftypefnx {} {[@var{y}, @var{sf}] =} filter (@var{b}, @var{a}, @var{x}, @var{si}, @var{dim}) Apply a 1-D digital filter to the data @var{x}. @code{filter} returns the solution to the following linear, time-invariant difference equation: @tex $$ \sum_{k=0}^N a_{k+1} y_{n-k} = \sum_{k=0}^M b_{k+1} x_{n-k}, \qquad 1 \le n \le P $$ @end tex @ifnottex @c Set example in small font to prevent overfull line @smallexample @group N M SUM a(k+1) y(n-k) = SUM b(k+1) x(n-k) for 1<=n<=length(x) k=0 k=0 @end group @end smallexample @end ifnottex @noindent where @ifnottex N=length(a)-1 and M=length(b)-1. @end ifnottex @tex $a \in \Re^{N-1}$, $b \in \Re^{M-1}$, and $x \in \Re^P$. @end tex The result is calculated over the first non-singleton dimension of @var{x} or over @var{dim} if supplied. An equivalent form of the equation is: @tex $$ y_n = -\sum_{k=1}^N c_{k+1} y_{n-k} + \sum_{k=0}^M d_{k+1} x_{n-k}, \qquad 1 \le n \le P $$ @end tex @ifnottex @c Set example in small font to prevent overfull line @smallexample @group N M y(n) = - SUM c(k+1) y(n-k) + SUM d(k+1) x(n-k) for 1<=n<=length(x) k=1 k=0 @end group @end smallexample @end ifnottex @noindent where @ifnottex c = a/a(1) and d = b/a(1). @end ifnottex @tex $c = a/a_1$ and $d = b/a_1$. @end tex If the fourth argument @var{si} is provided, it is taken as the initial state of the system and the final state is returned as @var{sf}. The state vector is a column vector whose length is equal to the length of the longest coefficient vector minus one. If @var{si} is not supplied, the initial state vector is set to all zeros. In terms of the Z Transform, @var{y} is the result of passing the discrete-time signal @var{x} through a system characterized by the following rational system function: @tex $$ H(z) = {\displaystyle\sum_{k=0}^M d_{k+1} z^{-k} \over 1 + \displaystyle\sum_{k+1}^N c_{k+1} z^{-k}} $$ @end tex @ifnottex @example @group M SUM d(k+1) z^(-k) k=0 H(z) = --------------------- N 1 + SUM c(k+1) z^(-k) k=1 @end group @end example @end ifnottex @seealso{filter2, fftfilt, freqz} @end deftypefn */) { int nargin = args.length (); if (nargin < 3 || nargin > 5) print_usage (); int dim; dim_vector x_dims = args(2).dims (); if (nargin == 5) { dim = args(4).nint_value () - 1; if (dim < 0 || dim >= x_dims.ndims ()) error ("filter: DIM must be a valid dimension"); } else dim = x_dims.first_non_singleton (); octave_value_list retval; const char *a_b_errmsg = "filter: A and B must be vectors"; const char *x_si_errmsg = "filter: X and SI must be arrays"; bool isfloat = (args(0).is_single_type () || args(1).is_single_type () || args(2).is_single_type () || (nargin >= 4 && args(3).is_single_type ())); if (args(0).is_complex_type () || args(1).is_complex_type () || args(2).is_complex_type () || (nargin >= 4 && args(3).is_complex_type ())) { if (isfloat) { FloatComplexColumnVector b = args(0).xfloat_complex_vector_value (a_b_errmsg); FloatComplexColumnVector a = args(1).xfloat_complex_vector_value (a_b_errmsg); FloatComplexNDArray x = args(2).xfloat_complex_array_value (x_si_errmsg); FloatComplexNDArray si; if (nargin == 3 || args(3).is_empty ()) { octave_idx_type a_len = a.numel (); octave_idx_type b_len = b.numel (); octave_idx_type si_len = (a_len > b_len ? a_len : b_len) - 1; dim_vector si_dims = x.dims (); for (int i = dim; i > 0; i--) si_dims(i) = si_dims(i-1); si_dims(0) = si_len; si.resize (si_dims, 0.0); } else { si = args(3).xfloat_complex_array_value (x_si_errmsg); if (si.is_vector () && x.is_vector ()) si = si.reshape (dim_vector (si.numel (), 1)); } FloatComplexNDArray y (filter (b, a, x, si, dim)); retval = ovl (y, si); } else { ComplexColumnVector b = args(0).xcomplex_vector_value (a_b_errmsg); ComplexColumnVector a = args(1).xcomplex_vector_value (a_b_errmsg); ComplexNDArray x = args(2).xcomplex_array_value (x_si_errmsg); ComplexNDArray si; if (nargin == 3 || args(3).is_empty ()) { octave_idx_type a_len = a.numel (); octave_idx_type b_len = b.numel (); octave_idx_type si_len = (a_len > b_len ? a_len : b_len) - 1; dim_vector si_dims = x.dims (); for (int i = dim; i > 0; i--) si_dims(i) = si_dims(i-1); si_dims(0) = si_len; si.resize (si_dims, 0.0); } else { si = args(3).xcomplex_array_value (x_si_errmsg); if (si.is_vector () && x.is_vector ()) si = si.reshape (dim_vector (si.numel (), 1)); } ComplexNDArray y (filter (b, a, x, si, dim)); retval = ovl (y, si); } } else { if (isfloat) { FloatColumnVector b = args(0).xfloat_vector_value (a_b_errmsg); FloatColumnVector a = args(1).xfloat_vector_value (a_b_errmsg); FloatNDArray x = args(2).xfloat_array_value (x_si_errmsg); FloatNDArray si; if (nargin == 3 || args(3).is_empty ()) { octave_idx_type a_len = a.numel (); octave_idx_type b_len = b.numel (); octave_idx_type si_len = (a_len > b_len ? a_len : b_len) - 1; dim_vector si_dims = x.dims (); for (int i = dim; i > 0; i--) si_dims(i) = si_dims(i-1); si_dims(0) = si_len; si.resize (si_dims, 0.0); } else { si = args(3).xfloat_array_value (x_si_errmsg); if (si.is_vector () && x.is_vector ()) si = si.reshape (dim_vector (si.numel (), 1)); } FloatNDArray y (filter (b, a, x, si, dim)); retval = ovl (y, si); } else { ColumnVector b = args(0).xvector_value (a_b_errmsg); ColumnVector a = args(1).xvector_value (a_b_errmsg); NDArray x = args(2).xarray_value (x_si_errmsg); NDArray si; if (nargin == 3 || args(3).is_empty ()) { octave_idx_type a_len = a.numel (); octave_idx_type b_len = b.numel (); octave_idx_type si_len = (a_len > b_len ? a_len : b_len) - 1; dim_vector si_dims = x.dims (); for (int i = dim; i > 0; i--) si_dims(i) = si_dims(i-1); si_dims(0) = si_len; si.resize (si_dims, 0.0); } else { si = args(3).xarray_value (x_si_errmsg); if (si.is_vector () && x.is_vector ()) si = si.reshape (dim_vector (si.numel (), 1)); } NDArray y (filter (b, a, x, si, dim)); retval = ovl (y, si); } } return retval; } template MArray<double> filter (MArray<double>&, MArray<double>&, MArray<double>&, MArray<double>&, int dim); template MArray<double> filter (MArray<double>&, MArray<double>&, MArray<double>&, int dim); template MArray<Complex> filter (MArray<Complex>&, MArray<Complex>&, MArray<Complex>&, MArray<Complex>&, int dim); template MArray<Complex> filter (MArray<Complex>&, MArray<Complex>&, MArray<Complex>&, int dim); template MArray<float> filter (MArray<float>&, MArray<float>&, MArray<float>&, MArray<float>&, int dim); template MArray<float> filter (MArray<float>&, MArray<float>&, MArray<float>&, int dim); template MArray<FloatComplex> filter (MArray<FloatComplex>&, MArray<FloatComplex>&, MArray<FloatComplex>&, MArray<FloatComplex>&, int dim); template MArray<FloatComplex> filter (MArray<FloatComplex>&, MArray<FloatComplex>&, MArray<FloatComplex>&, int dim); /* %!shared a, b, x, r %!test %! a = [1 1]; %! b = [1 1]; %! x = zeros (1,10); x(1) = 1; %! assert (filter (b, [1], x ), [1 1 0 0 0 0 0 0 0 0]); %! assert (filter (b, [1], x.'), [1 1 0 0 0 0 0 0 0 0].'); %! assert (filter (b.', [1], x ), [1 1 0 0 0 0 0 0 0 0] ); %! assert (filter (b.', [1], x.'), [1 1 0 0 0 0 0 0 0 0].'); %! assert (filter ([1], a, x ), [+1 -1 +1 -1 +1 -1 +1 -1 +1 -1] ); %! assert (filter ([1], a, x.'), [+1 -1 +1 -1 +1 -1 +1 -1 +1 -1].'); %! assert (filter ([1], a.', x ), [+1 -1 +1 -1 +1 -1 +1 -1 +1 -1] ); %! assert (filter ([1], a.', x.'), [+1 -1 +1 -1 +1 -1 +1 -1 +1 -1].'); %! assert (filter (b, a, x ), [1 0 0 0 0 0 0 0 0 0] ); %! assert (filter (b.', a, x ), [1 0 0 0 0 0 0 0 0 0] ); %! assert (filter (b, a.', x ), [1 0 0 0 0 0 0 0 0 0] ); %! assert (filter (b.', a, x ), [1 0 0 0 0 0 0 0 0 0] ); %! assert (filter (b, a, x.'), [1 0 0 0 0 0 0 0 0 0].'); %! assert (filter (b.', a, x.'), [1 0 0 0 0 0 0 0 0 0].'); %! assert (filter (b, a.', x.'), [1 0 0 0 0 0 0 0 0 0].'); %! assert (filter (b.', a, x.'), [1 0 0 0 0 0 0 0 0 0].'); %!test %! r = sqrt (1/2) * (1+i); %! a = a*r; %! b = b*r; %! assert (filter (b, [1], x ), r*[1 1 0 0 0 0 0 0 0 0] ); %! assert (filter (b, [1], r*x ), r*r*[1 1 0 0 0 0 0 0 0 0] ); %! assert (filter (b, [1], x.' ), r*[1 1 0 0 0 0 0 0 0 0].' ); %! assert (filter (b, a, x ), [1 0 0 0 0 0 0 0 0 0] ); %! assert (filter (b, a, r*x ), r*[1 0 0 0 0 0 0 0 0 0] ); %!shared a, b, x, y, so %!test %! a = [1,1]; %! b = [1,1]; %! x = zeros (1,10); x(1) = 1; %! [y, so] = filter (b, [1], x, [-1]); %! assert (y, [0 1 0 0 0 0 0 0 0 0]); %! assert (so, 0); %!test %! x = zeros (10,3); x(1,1) = -1; x(1,2) = 1; %! y0 = zeros (10,3); y0(1:2,1) = -1; y0(1:2,2) = 1; %! y = filter (b, [1], x); %! assert (y, y0); %!test %! a = [1,1]; %! b=[1,1]; %! x = zeros (4,4,2); x(1,1:4,1) = +1; x(1,1:4,2) = -1; %! y0 = zeros (4,4,2); y0(1:2,1:4,1) = +1; y0(1:2,1:4,2) = -1; %! y = filter (b, [1], x); %! assert (y, y0); %!assert (filter (1, ones (10,1) / 10, []), []) %!assert (filter (1, ones (10,1) / 10, zeros (0,10)), zeros (0,10)) %!assert (filter (1, ones (10,1) / 10, single (1:5)), repmat (single (10), 1, 5)) %% Test using initial conditions %!assert (filter ([1, 1, 1], [1, 1], [1 2], [1, 1]), [2 2]) %!assert (filter ([1, 1, 1], [1, 1], [1 2], [1, 1]'), [2 2]) %!assert (filter ([1, 3], [1], [1 2; 3 4; 5 6], [4, 5]), [5 7; 6 10; 14 18]) %!error (filter ([1, 3], [1], [1 2; 3 4; 5 6], [4, 5]')) %!assert (filter ([1, 3, 2], [1], [1 2; 3 4; 5 6], [1 0 0; 1 0 0], 2), [2 6; 3 13; 5 21]) ## Test of DIM parameter %!test %! x = ones (2, 1, 3, 4); %! x(1,1,:,:) = [1 2 3 4; 5 6 7 8; 9 10 11 12]; %! y0 = [1 1 6 2 15 3 2 1 8 2 18 3 3 1 10 2 21 3 4 1 12 2 24 3]; %! y0 = reshape (y0, size (x)); %! y = filter ([1 1 1], 1, x, [], 3); %! assert (y, y0); */