It looks like you're new here. If you want to get involved, click one of these buttons!

- All Categories 1.6K
- General 37
- Azimuth Project 95
- - Latest Changes 345
- News and Information 222
- - Strategy 93
- - Questions 39
- Azimuth Forum 25
- - Conventions and Policies 21
- Chat 166
- Azimuth Blog 132
- - - Action 13
- - - Biodiversity 7
- - - Books 1
- - - Carbon 7
- - - Climate 41
- - - Computational methods 34
- - - Earth science 21
- - - Ecology 40
- - - Energy 28
- - - Geoengineering 0
- - - Mathematical methods 62
- - - Oceans 4
- - - Methodology 16
- - - Organizations 33
- - - People 6
- - - Reports 3
- - - Software 19
- - - Statistical methods 1
- - - Things to do 1
- - - Visualisation 1
- - - Meta 7
- - - Natural resources 4
- Azimuth Wiki 6
- - - Experiments 23
- - - Sustainability 4
- - - Publishing 3
- Azimuth Code Project 69
- - Spam 1

I need to learn how to compute the flux for sparse data.

I looked at the volumetric GPM data for precipitation and it does not look like a continuous function, rather it is sparse partitioned and distanced spread of regions of moisture.

So my previous work to compute the Laplacian might or might not apply.

I was wondering how one goes about mathematically computing the flux of sparse data.

Dara

## Comments

Kriging? http://en.wikipedia.org/wiki/Kriging

AKA Gaussian process regression and a form of geo-spatial interpolation

`Kriging? <http://en.wikipedia.org/wiki/Kriging> AKA Gaussian process regression and a form of geo-spatial interpolation`

thanx paul, I study this

`thanx paul, I study this`

Paul check out the NonlinearModelFit [ ] in Mathematica I think it is using the Gaussian process.

`Paul check out the NonlinearModelFit [ ] in Mathematica I think it is using the Gaussian process.`

Dara, I am using these options for NonLinearModelFit :

Method -> "NMinimize"

Method -> "Differential Evolution"

`Dara, I am using these options for NonLinearModelFit : Method -> "NMinimize" Method -> "Differential Evolution"`

You are a genius Paul.

Paul Mathematica's Differential Evolution is not parallelized, I want to write a version in C that is parallelized in GPU servers.

Dara

`You are a genius Paul. Paul Mathematica's Differential Evolution is not parallelized, I want to write a version in C that is parallelized in GPU servers. Dara`

Dara, I still do not know if the Eureqa tool I occasionally use incorporates Differential Evolution, but it certainly does use all 8 of the CPU's when it is running.

Paul

`Dara, I still do not know if the Eureqa tool I occasionally use incorporates Differential Evolution, but it certainly does use all 8 of the CPU's when it is running. Paul`