Re: [Matplotlib-users] Fwd: speed of clearing and creating a new array
Alan G Isaac wrote: > On Tuesday 08 April 2008 10:46:32 am Bryan Fodness wrote: >> I am starting with a zero array, populate it according to >> some condition, save the graph > > I am going to need something along this line pretty soon. > What is the difference between matshow and pcolormesh for > this? (Besides the aspect ratio?) matshow is a compatibility interface to imshow, which is restricted to regular rectangular grids, but is the fastest way to make an image-like plot. pcolormesh is not as fast, but can handle arbitrary quadrilateral grids. There is also code to handle irregular rectangular grids at a speed intermediate between imshow and pcolormesh (which is a wrapper for quadmesh). A unified interface to all of these is provided by the pcolorfast axes method in svn. Its API may need tweaking; suggestions are welcome. Eric > > Thank you, > Alan Isaac > > > > > > - > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > Register now and save $200. Hurry, offer ends at 11:59 p.m., > Monday, April 7! Use priority code J8TLD2. > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > ___ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users - This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Register now and save $200. Hurry, offer ends at 11:59 p.m., Monday, April 7! Use priority code J8TLD2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Fwd: speed of clearing and creating a new array
On Tuesday 08 April 2008 10:46:32 Bryan Fodness wrote: > I am starting with a zero array, populate it according to some > condition, save the graph, and then reset the array to zero. Can > someone tell me if there is a better (faster) way to do this? My 2c: * Use inplace addition to save some space while something: if something: if something: a[y,x] += 1 * To set all the values to 0: a.flat = 0 - This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Register now and save $200. Hurry, offer ends at 11:59 p.m., Monday, April 7! Use priority code J8TLD2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Fwd: speed of clearing and creating a new array
On Tuesday 08 April 2008 10:46:32 am Bryan Fodness wrote: > I am starting with a zero array, populate it according to some > condition, save the graph, and then reset the array to zero. Can > someone tell me if there is a better (faster) way to do this? You might ask at the numpy mailing list, but I suspect that a *= 0 might be faster. > Or am I > just doing that much, and that is how long it will take? I have a > couple hundred graphs that I am creating, that will ultimately be > combined for animation. > > ay=4000 > ax=60 > #create empty array > a = zeros((ay,ax), int) > > while something: > pcolormesh(X, Y, a) > figname = 'Frame%03d' %int(field) > print figname > savefig(figname) > # reset values > a = zeros((ay,ax), int) > if something: > if something: > a[y,x] = a[y,x]+1 - This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Register now and save $200. Hurry, offer ends at 11:59 p.m., Monday, April 7! Use priority code J8TLD2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Fwd: speed of clearing and creating a new array
I am starting with a zero array, populate it according to some condition, save the graph, and then reset the array to zero. Can someone tell me if there is a better (faster) way to do this? Or am I just doing that much, and that is how long it will take? I have a couple hundred graphs that I am creating, that will ultimately be combined for animation. ay=4000 ax=60 #create empty array a = zeros((ay,ax), int) while something: pcolormesh(X, Y, a) figname = 'Frame%03d' %int(field) print figname savefig(figname) # reset values a = zeros((ay,ax), int) if something: if something: a[y,x] = a[y,x]+1 - This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Register now and save $200. Hurry, offer ends at 11:59 p.m., Monday, April 7! Use priority code J8TLD2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
