| T O P I C R E V I E W |
| mikkomaek |
Posted - 09/19/2017 : 05:36:38 AM
Origin Ver. and Service Release (Select Help-->About Origin): 2017 SR2
Operating System: Windows 7 on Parallels 12
Hi,
I'm trying to calculate the kernel densities of a dataset that consists of two data vectors (~1,700,000 rows). The calculation has been slow with smaller datasets, but with this one won't go through at all. I've assigned half of my 16 GB Mac RAM to the virtual machine. Any ideas how to make this happen?
The formula:
ks2density(Col(1), Col(2), Col(1), Col(2), wx, wy)
Before script:
double wx, wy;
kernel2width(Col(1), Col(2), wx, wy);
Thanks!
Mikko |
| 9 L A T E S T R E P L I E S (Newest First) |
| mikkomaek |
Posted - 11/06/2017 : 02:25:49 AM
Hi Hideo,
Sorry but I have to bother you once more on the gridding.
I tried it but didn't really succeed in calculating the densities for a specified grid. If I calculate symmetric grid intervals based on the xy-scale and XYZ grid them, I'll only have a matrix with the Z values on numbered rows and columns. I also tried to calculate the densities based on my symmetric grid, but the plotting doesn't really turn out right.
Your right, calculating the densities at 1,700,000 locations is an overkill. I can plot the densities based on less as long as the plot still includes all the points.
Thanks!
Mikko |
| Hideo Fujii |
Posted - 10/18/2017 : 1:38:53 PM
Hi Mikko,
As described in our document for ks2density(http://www.originlab.com/doc/LabTalk/ref/ks2density-func),
your formula: ks2density(Col(1), Col(2), Col(1), Col(2), wx, wy); calculates the density value at 1,700,000
points. unless you need the density value at every point, it sounds overkilling. Otherwise, you can create
grid XY points in the col(3) and col(4) (such by making a matrix of, say 25x25 with proper XY ranges
having values no matter, convert to XYZ worksheet, then paste XY columns to col(3) and col(4)). In col(5),
you can run: ks2density(col(3), col(4), Col(1), Col(2), wx, wy); In this method, it took around 12 minutes.
(In my previous test, I measured the time of 2D kernel density plotting, and this way performed much faster
to produce the output matrix - very efficient!)
If you need the density values at the input datasets, giving up to get all, but you can sample to reduce the
output data points.
Hope this suggestion helps.
--Hideo Fujii
OriginLab |
| mikkomaek |
Posted - 10/17/2017 : 02:14:09 AM
Hi Hideo,
Thanks for your reply! Could you write an example how to adjust the grid size?
BR
Mikko |
| Hideo Fujii |
Posted - 09/28/2017 : 5:14:33 PM
Hi Mikko,
I have tried 1,700,000 data points by normal random numbers with various numbers of grids at each direction on my
machine (Intel Core Duo 3.16GHz 4GB memory). #Grids Elapsed Time(min)
25 => 0.6
32 => 1.1
50 => 2.6
75 => 6.5
100 -> 30.2 Based on this, it seems time costs of the power of around 5, and rapidly becomes too slow with more than 50x50 grids.
(Then, if #Grids=200, it may take ~1000 min.)
So, at least for now, I suggest you to set the wx and wy to set the the number of grids to 50 or so (as well as to use
the native Windows machine or Boot Camp on Mac).
--Hideo Fujii
OriginLab |
| mikkomaek |
Posted - 09/28/2017 : 02:21:24 AM
Hi Origin Support,
Any reply to this question?
BR
Mikko
quote:
Originally posted by mikkomaek
Hi Aviel,
Thanks for your reply. You wrote the calculation was slow, but did it actually go through? If it did, was it on VM with OriginPro or a Windows computer?
I am ready to wait if I am able to get the plots in the end.
Thanks!
Mikko
|
| mikkomaek |
Posted - 09/21/2017 : 03:47:45 AM
Hi Aviel,
Thanks for your reply. You wrote the calculation was slow, but did it actually go through? If it did, was it on VM with OriginPro or a Windows computer?
I am ready to wait if I am able to get the plots in the end.
Thanks!
Mikko |
| arstern |
Posted - 09/20/2017 : 09:39:33 AM
Hi Mikko,
We took a look at your project file and it was very slow to use. Unfortunately, It seems that the slow calculation is reasonable. Improvements have already been made on the performance on Kernel Density plotting, therefore it seems that with the combination of using Parallels and plotting with a large dataset you have reached the limitation for plotting a kernel density plot.
Aviel
OriginLab |
| Hideo Fujii |
Posted - 09/19/2017 : 09:43:52 AM
Hi Mikko,
> my 16 GB Mac RAM to the virtual machine
Beside the intrinsic issue of your problem, if you are using Parallel, VMWare, etc., you can try "Boot Camp"
dual-boot system of Apple, if it can be an option in your situation, because it should run much faster as the
"native" Windows without performance penalty (though I guess that dealing with your 1,700,000 rows data
may not be helped enough by this way).
http://www.originlab.com/index.aspx?go=Support/DocumentationAndHelpCenter/Installation/RunOriginonaMac
--Hideo Fujii
OriginLab |
| arstern |
Posted - 09/19/2017 : 09:26:39 AM
Hi,
Could you please e-mail your opj file to Tech Support via tech@originlab.com.
Thanks,
Aviel
OriginLab |
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