[MUG] Run out of memory

[MUG] Re: Run out of memory
Author: Maple User Group    Posted: Mon, 4 Nov 2002 10:21:38 -0500 (
>> From: Maple User Group "maple_gr" -=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=- From: "Dr Francis J. Wright" "F.J.Wright" To: "maple-list" Subject: Run out of memory Date: Fri, 1 Nov 2002 16:41:30 -0000 From: "Robert Fischer" "rfischer" | At first I work with Maple 5 Release 5 under Unix. | I wrote a loop aiming to do the following: | Maple reads in data produced by an external C programm using the | readdata-command. After some computation and conversion of the data in | a list of list of points the data is given to the surfdata-command to | yield a 3d plot. This plot is saved in the jpg-format and put into a | directory using interface and plotoutput commands. | This loop should serve to produce hundreds of pictures of my data. | After about 20 goings of my loop the following error occurs: could not | fork process. I have found out that Maple has used all memory my computer | provides. Have you an idea how to avoid this problem ? | | The second problem which may be connected to my problem mentioned above is | : Within the loop all results and assignments are presented on the screen. | I did not put : behind the od of the loop in order to prevent the | presentation on the screen because if I did so my pictures would not be | produced in the jpeg and put into the directory. | Do you have a suggestion how to produce the plots avoiding the screen | output? I wouldn't use Maple for this kind of plotting; I would use something like gnuplot (which is free). Maple graphics are excellent for investigating data generated within Maple, but trying to use Maple just as a graphics back-end does not seem like a good idea to me. Francis -=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=- Date: Fri, 1 Nov 2002 08:39:51 -0800 (PST) From: Robert Israel "israel" To: "maple-list" Subject: Run out of memory Worksheets with lots of 3D plots can sometimes take up inordinate amounts of memory under Unix. But there's no need to display the plots, or any other results, on the screen. All you have to do is something like this: for ... do ... plotsetup(jpeg, plotoutput=..., plotoptions=...); print(surfdata(...)); ... od: plotsetup(default); Robert Israel "israel" Department of Mathematics http://www.math.ubc.ca/~israel University of British Columbia Vancouver, BC, Canada V6T 1Z2 -=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=- Date: Fri, 01 Nov 2002 11:10:43 -0800 From: Allan Wittkopf "awittkop" Subject: Run out of memory To: "maple-list" Could you send us the code for this problem. Thanks, Allan -=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=- Date: Sat, 2 Nov 2002 02:17:25 -0500 (EST) From: Carl Devore "devore" To: "maple-list" Subject: Run out of memory You mention using plotoutput, but not plotsetup. That might be the problem. I have not tested the following in Maple 5, but it works in Maple 8 without any appreciable build up of memory and without any screen display: R:= rand(-50..50): for n to 100 do plotsetup(jpeg, plotoutput= sprintf("%d.jpg", n)); print(plots[surfdata]([seq([seq([i,j,R()], i= 1..50)], j= 1..50)])) od:

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