matlab - Speed up creation of impoint objects -


i have create draggable points on axes. however, seems slow process, on machine taking bit more second when done so:

x = rand(100,1); y = rand(100,1);  tic; = 1:100     h(i) = impoint(gca, x(i), y(i)); end toc;

any ideas on speed highly appreciated.

the idea provide user possibility correct positions in figure have been calculated matlab, here exemplified random numbers.

you can use the ginput cursor within while loop mark points want edit. afterwards click outside axes leave loop, move points , accept key.

f = figure(1); scatter(x,y); ax = gca; = 1;  while 1         [u,v] = ginput(1);         if ~inpolygon(u,v,ax.xlim,ax.ylim); break; end;         [~, ind] = min(hypot(x-u,y-v));         h(i).handle = impoint(gca, x(ind), y(ind));         h(i).index  = ind;         = + 1;  end

enter image description here

depending on how you're updating plot can gain general speedup using functions clf (clear figure) , cla (clear axes) instead of opening new figure window explained in this answer may useful.

alternatively following rough idea of meant in comments. throws various errors , don't have time debug right now. maybe helps starting point.

1) conventional plotting of data , activating of datacursormode

x = rand(100,1); y = rand(100,1); xlim([0 1]); ylim([0 1])  f = figure(1) scatter(x,y)  datacursormode on dcm = datacursormode(f); set(dcm,'displaystyle','datatip','enable','on','updatefcn',@customupdatefunction)

2) custom update function evaluating chosen datatip , creating impoint

function txt = customupdatefunction(empt,event_obj)  pos = get(event_obj,'position'); ax = get(event_obj.target,'parent'); sc = get(ax,'children');  x = sc.xdata; y = sc.ydata; mask = x == pos(1) & y == pos(2); x(mask) = nan; y(mask) = nan; set(sc, 'xdata', x, 'ydata', y); set(datacursormode(gcf),'enable','off')  impoint(ax, pos(1),pos(2)); delete(findall(ax,'type','hggroup','handlevisibility','off'));  txt = {};

it works the, if you'd want move 1 point. reactivating datacursormode , setting second point fails:

enter image description here

maybe can find error.


Comments

Post a Comment

Popular posts from this blog

toolbar - How to add link to user registration inside toobar in admin joomla 3 custom component -

im trying write component admin side , need add user creation. dont want duplicate existing codes add link. know how add task not simple link toolbar. thx help. if wanting button opens new user screen can try in component: $bar = jtoolbar::getinstance('toolbar'); $bar->appendbutton('link', 'users', 'new user','index.php?option=com_users&task=user.add'); you need add view.html.php file wherever you're creating toolbar. is need?
Read more

linux - disk space limitation when creating war file -

i have 1 gb disk space limitation hosting app , have used 700mb of it. however want create war file directory big (around 600mb) using command : jar -cvf root.war folderpath that's why encounter quota limitation , can't following. i'm looking way delete folder content when it's applying archive conserve disk space take note can't install zip tool in ssh shell ~ the code works on test directories, test first anyway, deletes files. it's not efficient. assumptions: 300mb free space, in destructively compress 600mb folderpath directory. none of files big -- if file in folderpath 300mb or larger, fail. notes: if ' $out ' file exists, nothing. first find pipes file list while , if ' $out ' doesn't exist in loop, create it, don't update -- if does exist, update it. each pass adds 1 more file, deletes unless file directory. after loop finishes delete empty directories too. unset u ; in=folderpath ; out=roo...
Read more