comparison doc/interpreter/stmt.txi @ 19627:446c46af4b42 stable

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author John W. Eaton <jwe@octave.org>
date Tue, 20 Jan 2015 08:26:57 -0500
parents faf32a725693
children 0e1f5a750d00
comparison
equal deleted inserted replaced
19488:8dbd55742112 19627:446c46af4b42
4 @c 4 @c
5 @c Octave is free software; you can redistribute it and/or modify it 5 @c Octave is free software; you can redistribute it and/or modify it
6 @c under the terms of the GNU General Public License as published by the 6 @c under the terms of the GNU General Public License as published by the
7 @c Free Software Foundation; either version 3 of the License, or (at 7 @c Free Software Foundation; either version 3 of the License, or (at
8 @c your option) any later version. 8 @c your option) any later version.
9 @c 9 @c
10 @c Octave is distributed in the hope that it will be useful, but WITHOUT 10 @c Octave is distributed in the hope that it will be useful, but WITHOUT
11 @c ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 @c ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 @c FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 @c FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 @c for more details. 13 @c for more details.
14 @c 14 @c
15 @c You should have received a copy of the GNU General Public License 15 @c You should have received a copy of the GNU General Public License
16 @c along with Octave; see the file COPYING. If not, see 16 @c along with Octave; see the file COPYING. If not, see
17 @c <http://www.gnu.org/licenses/>. 17 @c <http://www.gnu.org/licenses/>.
18 18
19 @node Statements 19 @node Statements
463 true, and the test of the condition is at the end of the loop, so the 463 true, and the test of the condition is at the end of the loop, so the
464 body of the loop is always executed at least once. As with the 464 body of the loop is always executed at least once. As with the
465 condition in an @code{if} statement, the condition in a @code{do-until} 465 condition in an @code{if} statement, the condition in a @code{do-until}
466 statement is considered true if its value is non-zero, and false if its 466 statement is considered true if its value is non-zero, and false if its
467 value is zero. If the value of the conditional expression in a 467 value is zero. If the value of the conditional expression in a
468 @code{do-until} statement is a vector or a matrix, it is considered 468 @code{do-until} statement is a vector or a matrix, it is considered
469 true only if it is non-empty and @emph{all} of the elements are non-zero. 469 true only if it is non-empty and @emph{all} of the elements are non-zero.
470 470
471 Octave's @code{do-until} statement looks like this: 471 Octave's @code{do-until} statement looks like this:
472 472
473 @example 473 @example
566 endfor 566 endfor
567 disp ("Loop over a cell array") 567 disp ("Loop over a cell array")
568 for i = @{1,"two";"three",4@} 568 for i = @{1,"two";"three",4@}
569 i 569 i
570 endfor 570 endfor
571 @end group 571 @end group
572 @end example 572 @end example
573 573
574 @noindent 574 @noindent
575 In this case the variable @code{i} takes on the value of the columns of 575 In this case the variable @code{i} takes on the value of the columns of
576 the matrix or cell matrix. So the first loop iterates twice, producing 576 the matrix or cell matrix. So the first loop iterates twice, producing
582 @group 582 @group
583 a = [1,3;2,4]; c = cat (3, a, 2*a); 583 a = [1,3;2,4]; c = cat (3, a, 2*a);
584 for i = c 584 for i = c
585 i 585 i
586 endfor 586 endfor
587 @end group 587 @end group
588 @end example 588 @end example
589 589
590 @noindent 590 @noindent
591 In the above case, the multi-dimensional matrix @var{c} is reshaped to a 591 In the above case, the multi-dimensional matrix @var{c} is reshaped to a
592 two-dimensional matrix as @code{reshape (c, rows (c), 592 two-dimensional matrix as @code{reshape (c, rows (c),
638 638
639 @print{} key = a 639 @print{} key = a
640 @print{} val = 1 640 @print{} val = 1
641 @print{} key = b 641 @print{} key = b
642 @print{} val = 642 @print{} val =
643 @print{} 643 @print{}
644 @print{} 1 2 644 @print{} 1 2
645 @print{} 3 4 645 @print{} 3 4
646 @print{} 646 @print{}
647 @print{} key = c 647 @print{} key = c
648 @print{} val = string 648 @print{} val = string
649 @end group 649 @end group
650 @end example 650 @end example
651 651
769 @cindex @code{unwind_protect} statement 769 @cindex @code{unwind_protect} statement
770 @cindex @code{unwind_protect_cleanup} 770 @cindex @code{unwind_protect_cleanup}
771 @cindex @code{end_unwind_protect} 771 @cindex @code{end_unwind_protect}
772 772
773 Octave supports a limited form of exception handling modeled after the 773 Octave supports a limited form of exception handling modeled after the
774 unwind-protect form of Lisp. 774 unwind-protect form of Lisp.
775 775
776 The general form of an @code{unwind_protect} block looks like this: 776 The general form of an @code{unwind_protect} block looks like this:
777 777
778 @example 778 @example
779 @group 779 @group
785 @end group 785 @end group
786 @end example 786 @end example
787 787
788 @noindent 788 @noindent
789 where @var{body} and @var{cleanup} are both optional and may contain any 789 where @var{body} and @var{cleanup} are both optional and may contain any
790 Octave expressions or commands. The statements in @var{cleanup} are 790 Octave expressions or commands. The statements in @var{cleanup} are
791 guaranteed to be executed regardless of how control exits @var{body}. 791 guaranteed to be executed regardless of how control exits @var{body}.
792 792
793 This is useful to protect temporary changes to global variables from 793 This is useful to protect temporary changes to global variables from
794 possible errors. For example, the following code will always restore 794 possible errors. For example, the following code will always restore
795 the original value of the global variable @code{frobnosticate} 795 the original value of the global variable @code{frobnosticate}