Loren, what you ideally want is a plugin architecture like Visual Studio whereby someone can write a ReSharper addin. Possibly one of the single most productivity and code-clarity beneficial addins I have ever used. Although the “beast of Redmond” is much derided I would urge any language developer to look at the functionality and usability of their IDE.

—Loren

The method requires some trial and error regarding the step size, particularly near the start and stop when the data is a bit noisy (you need at least 3 points in each step). But it seems to work reasonably well and a modified version could be used to calculating the area under a planar surface.

I work with scattered data representing a surface frequently (usually seafloor mapping efforts) and are always looking for better ways of thinking about it. I usually grid the data to reduce the data density and noise in the measurements.

There are some nuances to doing this that many folks forget. GRIDDATA is, in general, NOT the tool of choice, as it is an interpolating algorithm which, is better suited to fill in the gaps of sparsely sampled data. Indeed, if one were to try to quantify the uncertainty in the results of GRIDDATA, they should find it to be larger than that of their original data.

There are plenty of Krigging functions on the FEX but this method assumes a-priori knowledge of the surface’s roughness statistics (a variogram) which I am loath to guess.

To my knowledge MATLAB does not have a simple average spacial gridding function. I have written my own with several variants for weighting of data points and estimating the uncertainty of the resulting grid from the standard deviation of the input data within each grid cell. These are standard techniques in seafloor mapping that are largely not addressed in MATLAB to my knowledge.

-Val

Moreover, I think the ability to do this at this low level is great, but why must it always be so hard? Here’s the level at which I think it should work:

One should be able to list all instances of MATLAB running on the local network (or specify an IP address for a specific computer). Then one should be able to select an instance and “send” it any MATLAB variable/matrix/object/structure/cellarray/etc. The receiver should be able to automatically accept objects sent from known senders or should be prompted for acceptance. All the details regarding the connection should be completely transparent. It should just work.

Another feature should include the ability to share a workspace between two instances of MATLAB. In that way, users collaborating on a data set could work simultaneously and see each other’s results. One could even select which plots should show up on the other person’s workstation.

My 2 cents.

Val

I would be interested to see a similar post (and the comments) for finding the intersection between 2 lines in 3D space. Certainly not a straight-forward problem. Perhaps also the problem of finding a solution with some tolerance, or rather their closest point of intersection.

Thanks,
Val

I’ve experimented with memory mapped files assigned under the struct and this works sometimes but requires a whole directory of files (1 per field) and keeping the paths consistent has proved problematic.

So please register my vote for access to cell arrays and struct fields.

Thanks,

Val

We have chosen to support CUDA and not Open CL due to the fact that CUDA currently has the only ecosystem with all of the libraries necessary for technical computing. This may change as open CL libraries advance and evolve.

Cheers,
Sarah

“% each element of ROI, tar and cor is 128×128
for i=1:47*2
if i<=48
ROI{i} = logical(cor{i}) ;
else
ROI{i} = logical(tar{i-47}) ;
end
end"

this seems right.