Mercurial > octave
annotate scripts/specfun/realsqrt.m @ 27919:1891570abac8
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2020.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 06 Jan 2020 22:29:51 -0500 |
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1 ## Copyright (C) 2008-2020 The Octave Project Developers |
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2 ## |
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3 ## See the file COPYRIGHT.md in the top-level directory of this distribution |
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4 ## or <https://octave.org/COPYRIGHT.html/>. |
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5 ## |
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6 ## |
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7 ## This file is part of Octave. |
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8 ## |
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9 ## Octave is free software: you can redistribute it and/or modify it |
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10 ## under the terms of the GNU General Public License as published by |
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11 ## the Free Software Foundation, either version 3 of the License, or |
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12 ## (at your option) any later version. |
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13 ## |
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14 ## Octave is distributed in the hope that it will be useful, but |
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15 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 ## GNU General Public License for more details. |
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18 ## |
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19 ## You should have received a copy of the GNU General Public License |
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20 ## along with Octave; see the file COPYING. If not, see |
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21 ## <https://www.gnu.org/licenses/>. |
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22 |
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23 ## -*- texinfo -*- |
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24 ## @deftypefn {} {} realsqrt (@var{x}) |
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25 ## Return the real-valued square root of each element of @var{x}. |
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26 ## |
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27 ## If any element results in a complex return value @code{realsqrt} aborts and |
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28 ## issues an error. |
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29 ## @seealso{sqrt, realpow, reallog} |
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30 ## @end deftypefn |
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31 |
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32 function y = realsqrt (x) |
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33 |
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34 if (nargin != 1) |
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35 print_usage (); |
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36 elseif (iscomplex (x) || any (x(:) < 0)) |
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37 error ("realsqrt: produced complex result"); |
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38 else |
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39 y = sqrt (x); |
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40 endif |
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41 |
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42 endfunction |
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43 |
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44 |
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45 %!assert (realsqrt (1:5), sqrt (1:5)) |
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46 %!test |
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47 %! x = rand (10, 10); |
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48 %! assert (realsqrt (x), sqrt (x)); |
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49 |
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50 %!error realsqrt () |
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51 %!error realsqrt (1,2) |
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52 %!error <produced complex result> realsqrt (-1) |