27 results found

1. Add script mode of working and feature to upload data from external datafiles
   6 votes

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   2 comments  ·  Delete…  ·  Admin →
   declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

   Due to lack of clarification, we are closing this ticket. Please open a new ticket with a more specific feature request and it will be considered.

2. Add ability to rename functions
   4 votes

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   declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

   Thank you for the feedback. You may be able to do this by adding settings to your .octaverc file. For more information, you can e-mail GNU Octave at help@octave.org.

   In Octave Online, you can currently edit .octaverc manually using the octave prompt. A feature planned for a future release of Octave Online includes a more streamlined approach to editing .octaverc.

3. Increase the default time limit

   Hi,

   The 10 seconds for signed in users is not enough. I am working with the symbolic package, and here are some sample times. Note how elementary the computations are.

   octave:110> tic, [x, y ,z]=solve(x+y+z==6, x-y+z==2, x+2*y-z==2, x, y, z), toc
   x = (sym)!!! OUT OF TIME !!!
   1
   y = (sym) 2
   z = (sym) 3
   Elapsed time is 10.021 seconds.

   octave:108> tic, [x, y ,z]=solve(x+y+z==6, x-y+z==2, x+2*y-z==2, x, y, z), toc
   x = (sym) 1
   y = (sym) 2
   z = (sym) 3
   Elapsed time is 8.73142 seconds.

   octave:93> tic, [x, y ,z]=solve(x+y+z==6, x-y+z==2, x+2*y-z==2, x, y, z), toc

   !!! OUT OF TIME !!!

   In fact, just declaring some symbolic equations takes a lot of time:

   ---

   octave:104> tic, e1=x+y+z==6, e2=x-y+z==2, e3=x+2*y-z==2, toc
   e1 = (sym) x + y + z = 6
   e2 = (sym) x - y + z = 2
   e3 = (sym) x + 2⋅y - z = 2
   Elapsed time is 8.5904 seconds.

   Hi,

   The 10 seconds for signed in users is not enough. I am working with the symbolic package, and here are some sample times. Note how elementary the computations are.

   octave:110> tic, [x, y ,z]=solve(x+y+z==6, x-y+z==2, x+2*y-z==2, x, y, z), toc
   x = (sym)!!! OUT OF TIME !!!
   1
   y = (sym) 2
   z = (sym) 3
   Elapsed time is 10.021 seconds.

   octave:108> tic, [x, y ,z]=solve(x+y+z==6, x-y+z==2, x+2*y-z==2, x, y, z), toc
   x = (sym) 1
   y = (sym) 2
   z = (sym) 3
   Elapsed time is 8.73142 seconds.

   octave:93> tic, [x, y ,z]=solve(x+y+z==6, x-y+z==2, x+2*y-z==2, x, y, z),… more

   3 votes

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   1 comment  ·  Delete…  ·  Admin →
   declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

   Hi Victorel! I’m merging this ticket with the main idea ticket for “Increase Time Limit”. I posted your note as a comment on that idea ticket.

4. syms Matlab command doesn't work

   the 'syms x' command doesn't work in online terminal:
   octave:33> syms x
   out = <output_block>
   <list>
   <item>
   <f>
   1003
   </f>
   <f>
   Communication established.
   </f>
   </item>
   <item>
   <f>
   1003
   </f>
   <f>
   0.7.6
   </f>
   </item>
   <item>
   <f>
   1003
   </f>
   <f>
   2.6.6 (r266:84292, Jan 22 2014, 09:42:36)
   [GCC 4.4.7 20120313 (Red Hat 4.4.7-4)]
   </f>
   </item>
   </list>
   </output_block>

   A =
   {
   [1,1] =
   Communication established.

   [1,2] =
   0.7.6

   [1,3] =
   2.6.6 (r266:84292, Jan 22 2014, 09:42:36)
   [GCC 4.4.7 20120313 (Red Hat 4.4.7-4)]

   }
   error: ipcpopen2: failed to send variables to python?
   error: called from:
   error: /usr/local/share/octave/packages/symbolic-2.1.0/private/pythonipcpopen2.m at line 115, column 5
   error: /usr/local/share/octave/packages/symbolic-2.1.0/private/pythonipcdriver.m at line 30, column 13
   error: /usr/local/share/octave/packages/symbolic-2.1.0/pythoncmd.m at line 120, column 9
   error: /usr/local/share/octave/packages/symbolic-2.1.0/@sym/sym.m at line 279, column 5
   error: evaluating argument list element number 3
   error: /usr/local/share/octave/packages/symbolic-2.1.0/syms.m at line 157, column 9

   the 'syms x' command doesn't work in online terminal:
   octave:33> syms x
   out = <output_block>
   <list>
   <item>
   <f>
   1003
   </f>
   <f>
   Communication established.
   </f>
   </item>
   <item>
   <f>
   1003
   </f>
   <f>
   0.7.6
   </f>
   </item>
   <item>
   <f>
   1003
   </f>
   <f>
   2.6.6 (r266:84292, Jan 22 2014, 09:42:36)
   [GCC 4.4.7 20120313 (Red Hat 4.4.7-4)]
   </f>
   </item>
   </list>
   </output_block>

   A =
   {
   [1,1] =
   Communication established.

   [1,2] =
   0.7.6

   [1,3] =
   2.6.6 (r266:84292, Jan 22 2014, 09:42:36)
   [GCC 4.4.7 20120313 (Red Hat 4.4.7-4)]

   }
   error: ipcpopen2: failed to send variables to python?
   error: called from:
   error: /usr/local/share/octave/packages/symbolic-2.1.0/private/pythonipcpopen2.m at line 115, column 5… more

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   0 comments  ·  Delete…  ·  Admin →
   declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

   I’m unable to reproduce this issue. It may have had to do with heavy server load.

5. fix parsing/display problem

   When an incomplete line is input, the interface doesn't display that. You have to type Enter for a second time to see the line continuation prompt

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   1 comment  ·  Delete…  ·  Admin →
   declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

   Thank you for using Octave Online. We do not have enough detail to understand the issue you reported. If you can provide more information we my re-open this ticket.

6. Allow Variable Saving!

   I noticed that connection losses reset the variables. Saving the variables would be helpful in case of disconnects.

   P.S. This is Ryan

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   0 comments  ·  Delete…  ·  Admin →
   declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

   Hi Ryan,

   Sorry for the late response.

   Sessions and variables should be saved for up to 15 seconds if your connection is temporarily lost. If you have frequent disconnects, it is good practice to periodically save variables to a *.mat file (using Octave’s “save” function).

   Shane

7. octave did not read image
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   0 comments  ·  Delete…  ·  Admin →
   declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

   See https://octaveonline.uservoice.com/forums/211888-general/suggestions/7148012-support-image-i-o

8. error: 'fitcsvm' undefined

   error: 'fitcsvm' undefined

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   0 comments  ·  Delete…  ·  Admin →
   declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

   Thanks for the idea. This function is unavailable in GNU Octave. You should consider contributing an implementation of it to the community: for more information, visit http://www.octave.org/missing.html.

9. Correcting the trigonometric results

   sin(100000000000000000000000000000000000000000000 * pi) = 0 I think, but the service told me that ans = -0.99999, it's very strange

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   0 comments  ·  Delete…  ·  Admin →
   declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

   Hi Alexander. The problem you are running into is a numerical precision issue. Numbers on the order of 1e44 do not have the level of precision required to make the sin() function evaluate them to their true algebraic value.

10. I realized the problem is because your warning "syms ..."

    The idea is to upload the Matlab syms.m function and change its name to ssyms for instance, then

    sssyms x y z

    it works fine

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    0 comments  ·  Delete…  ·  Admin →
    declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

    Hi, thanks for pointing this out. I’ve gone ahead and made the Symbolic package automatically in the Octave load path, including the built-in “syms” function. There was a major upgrade to the Symbolic package last month, which seems to have significantly improved the stability.

11. syms

    I tried to upload the Matlab syms (see below) function but, for instance

    syms s t

    do not works.

    ---

    function syms(varargin)
    %SYMS Short-cut for constructing symbolic objects.
    % SYMS arg1 arg2 ...
    % is short-hand notation for
    % arg1 = sym('arg1');
    % arg2 = sym('arg2'); ...
    %
    % SYMS arg1 arg2 ... real
    % is short-hand notation for
    % arg1 = sym('arg1','real');
    % arg2 = sym('arg2','real'); ...
    %
    % SYMS arg1 arg2 ... positive
    % is short-hand notation for
    % arg1 = sym('arg1','positive');
    % arg2 = sym('arg2','positive'); ...
    %
    % SYMS arg1 arg2 ... clear
    % is short-hand notation for
    % arg1 = sym('arg1','clear');
    % arg2 = sym('arg2','clear'); ...
    %
    % Each input argument must begin with a letter and must contain only
    % alphanumeric characters.
    %
    % By itself, SYMS lists the symbolic objects in the workspace.
    %
    % Examples:
    % syms x beta real
    % is equivalent to:
    % x = sym('x','real');
    % beta = sym('beta','real');
    %
    % syms k positive
    % is equivalent to:
    % k = sym('k','positive');
    %
    % To clear the symbolic objects x and beta of 'real' or 'positive' status, type
    % syms x beta clear
    %
    % See also SYM.

    % Deprecated API:
    % The 'unreal' keyword can be used instead of 'clear'.

    % Copyright 1993-2008 The MathWorks, Inc.
    % $Revision: 1.18.4.4 $ $Date: 2008/08/20 23:06:29 $

    if nargin < 1
    w = evalin('caller','whos');
    k = strmatch('sym',char({w.class,''}));
    disp(' ')
    disp({w(k).name})
    disp(' ')
    return
    end

    n = numel(varargin);
    for k = 1:n
    if ~isvarname(varargin{k})
    error('symbolic:sym:errmsg1','Not a valid variable name.')
    end
    end
    reals = strcmp(varargin{n},'real');
    unreals = strcmp(varargin{n},'unreal') | strcmp(varargin{n},'clear');
    pos = strcmp(varargin{n},'positive');
    if any(reals | unreals | pos), n = n-1; end
    for k = 1:n
    x = varargin{k};
    if reals
    assignin('caller',x,sym(x,'real'));
    elseif unreals
    assignin('caller',x,sym(x,'unreal'));
    elseif pos
    assignin('caller',x,sym(x,'positive'));
    else
    assignin('caller',x,sym(x));
    end
    end

    I tried to upload the Matlab syms (see below) function but, for instance

    syms s t

    do not works.

    ---

    function syms(varargin)
    %SYMS Short-cut for constructing symbolic objects.
    % SYMS arg1 arg2 ...
    % is short-hand notation for
    % arg1 = sym('arg1');
    % arg2 = sym('arg2'); ...
    %
    % SYMS arg1 arg2 ... real
    % is short-hand notation for
    % arg1 = sym('arg1','real');
    % arg2 = sym('arg2','real'); ...
    %
    % SYMS arg1 arg2 ... positive
    % is short-hand notation for
    % arg1 = sym('arg1','positive');
    % arg2 = sym('arg2','positive'); ...
    %
    % SYMS arg1 arg2 ... clear
    % is short-hand notation for… more

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    0 comments  ·  Delete…  ·  Admin →
    declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

    Hi, thanks for pointing this out. I’ve gone ahead and made the Symbolic package automatically in the Octave load path, including the built-in “syms” function. There was a major upgrade to the Symbolic package last month, which seems to have significantly improved the stability.

12. Publish run-able code online
    1 vote

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    0 comments  ·  Delete…  ·  Admin →
    declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

    Thanks for your feedback. I am merging this idea with the one below:

    http://octaveonline.uservoice.com/forums/211888-general/suggestions/7451341-publish-script-files

13. adding the control toolbox.

    I use Octave online for teaching engineers. It would be nice to be able to build transfer functions.

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    0 comments  ·  Delete…  ·  Admin →
    declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

    Hi,

    I am closing this ticket. If you still have issues, feel free to open a new ticket with more details on the error you are experiencing.

    -Shane

14. square wave

    plot square wave

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    0 comments  ·  Delete…  ·  Admin →
    declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

    Hi Aya,

    Thanks for supporting Octave Online. Your question relates to GNU Octave, not the online interface. I recommend you refer to the GNU Octave documentation for more information on how to plot square waves.

    Thanks, Shane

15. correct the trigonometric function or pi constant

    There is a problem when octave calculate cos(pi/2) (and probably other trigonometric funtions). Instead of 0 it results in 3.2679e-07, which is a "good" approximation, but not the right answer. It may be corrected.

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    0 comments  ·  Delete…  ·  Admin →
    declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

    Hi Fillipi,

    This is not a bug in Octave or Octave Online, it is a result of loss of precision when using floating-point arithmetic. For more information, see:

    http://wiki.octave.org/FAQ#Why_is_this_floating_point_computation_wrong.3F

    Thanks for the support,
    Octave Online Team

16. there is a wrong in plot command. I suggest that you have to check that and get better.

    I wrote this code:

    k=1.7;
    a=1.5;
    t1=1400;
    t2=1150;
    for l=0.15:0.15:0.90;
    Q=-ka((t2-t1)/l);
    disp(Q);
    end;

    ans:
    4250
    2125
    1416.7
    1062.5
    850.00
    708.33
    and I wrote :
    plot(Q,l);
    but ıt doesnt work to plot command.

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    1 comment  ·  Delete…  ·  Admin →
    declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

    The code is not correct for plotting. When you call plot, there is a scalar inside of Q. You need a vector inside Q. Try this code instead.

    octave:1> k=1.7;
    octave:2> a=1.5;
    octave:3> t1=1400;
    octave:4> t2=1150;
    octave:5> I=0.15:0.15:0.90;
    octave:6> Q=-k*1*((t2-t1)./I);
    octave:7> plot(Q,I);

17. cannot plot histogram

    i did following

    x = randn(1,10000);
    hist(x); % doesnt work
    plot(hist(x)) % prints garbage in plot window

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    1 comment  ·  Delete…  ·  Admin →
    declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

    Seems to work fine for me. See screenshot:

    http://i.imgur.com/pmoXryx.png

    You may have hit the server at a busy time. Histogram plots tend to be resource-intensive so the plot may not have finished before the timer killed the process.

18. GUI manual rotation of 3d plot

    I'm new to octave. Is there a way to take a 3d plot, like the sombrero, and drag it around to see different angles? Auto rotate would also be cool.

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    0 comments  ·  Delete…  ·  Admin →
    declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

    Thanks for the feedback. There is another suggestion already open for this feature. I encourage you to vote for it:

    https://octaveonline.uservoice.com/forums/211888-general/suggestions/6654926-change-camera-position-perspective-in-3d-plots

    I am closing this suggestion as a duplicate.

19. In the past, Octave-Online works very well with Opera Mobile Classic. But now the display window can not be removed.
    1 vote

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    declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

    Moved to a support ticket.

20. Other ways to log in

    like fb, openid, email, ... and the ability to save scripts, functions, diary, workspace and stat of octave per user

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    0 comments  ·  Delete…  ·  Admin →
    declined  ·  AdminShane (Octave Online Webmaster, Octave Online) responded

    Thanks for your feedback. There is a ticket for adding more sign in options: https://octaveonline.uservoice.com/forums/211888-general/suggestions/4112236-add-more-sign-in-options

    Once you sign in, there are already options to save scripts and have a custom workspace per user.