Mercurial > octave-dspies
view scripts/signal/freqz_plot.m @ 19010:3fb030666878 draft default tip dspies
Added special-case logical-indexing function
* logical-index.h (New file) : Logical-indexing function. May be called on
octave_value types via call_bool_index
* nz-iterators.h : Add base-class nz_iterator for iterator types. Array has
template bool for whether to internally store row-col or compute on the fly
Add skip_ahead method which skips forward to the next nonzero after its
argument
Add flat_index for computing octave_idx_type index of current position (with
assertion failure in the case of overflow)
Move is_zero to separate file
* ov-base-diag.cc, ov-base-mat.cc, ov-base-sparse.cc, ov-perm.cc
(do_index_op): Add call to call_bool_index in logical-index.h
* Array.h : Move forward-declaration for array_iterator to separate header file
* dim-vector.cc (dim_max): Refers to idx-bounds.h (max_idx)
* array-iter-decl.h (New file): Header file for forward declaration of
array-iterator
* direction.h : Add constants fdirc and bdirc to avoid having to reconstruct
them
* dv-utils.h, dv-utils.cc (New files) :
Utility functions for querying and constructing dim-vectors
* idx-bounds.h (New file) :
Utility constants and functions for determining whether things will overflow
the maximum allowed bounds
* interp-idx.h (New function : to_flat_idx) : Converts row-col pair to linear
index of octave_idx_type
* is-zero.h (New file) : Function for determining whether an element is zero
* logical-index.tst : Add tests for correct return-value dimensions and large
sparse matrix behavior
author | David Spies <dnspies@gmail.com> |
---|---|
date | Fri, 25 Jul 2014 13:39:31 -0600 |
parents | 9d59bc3dc12d |
children |
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## Copyright (C) 2002-2013 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/>. ## -*- texinfo -*- ## @deftypefn {Function File} {} freqz_plot (@var{w}, @var{h}) ## @deftypefnx {Function File} {} freqz_plot (@var{w}, @var{h}, @var{freq_norm}) ## Plot the magnitude and phase response of @var{h}. ## ## If the optional @var{freq_norm} argument is true, the frequency vector ## @var{w} is in units of normalized radians. If @var{freq_norm} is false, or ## not given, then @var{w} is measured in Hertz. ## @seealso{freqz} ## @end deftypefn ## Author: Paul Kienzle <pkienzle@users.sf.net> function freqz_plot (w, h, freq_norm = false) if (nargin < 2 || nargin > 3) print_usage (); endif n = length (w); ## ## exclude zero-frequency ## h = h (2 : length (h)); ## w = w (2 : length (w)); ## n = n-1; mag = 20 * log10 (abs (h)); phase = unwrap (arg (h)); if (freq_norm) x_label = 'Normalized Frequency (\times\pi rad/sample)'; else x_label = "Frequency (Hz)"; endif subplot (2, 1, 1); plot (w, mag); grid ("on"); axis ([w(1), w(n)], "autoy"); xlabel (x_label); ylabel ("Magnitude (dB)"); subplot (2, 1, 2); plot (w, phase*360/(2*pi)); grid ("on"); axis ([w(1), w(n)], "autoy"); xlabel (x_label); ylabel ("Phase (degrees)"); endfunction