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Code Listing by Wolfgang Schwanghart

Code 1-9 of 9   






dpsimplify uses the recursive Douglas-Peucker line simplification algorithm to reduce the number of vertices in a polyline according to a specified tolerance. The algorithm is also know as Iterative Endpoint Fit algorithm. dpsimplify can handle polylines and polygones in 2d and higher dimensions.

The submission now contains another m-file (dpsimplify_octave.m) that has been slightly modified to run with GNU Octave.



shufflelabel randomly changes the order of label values in a label matrix. Zeros and nans are ignored. The label matrix can be every numerical data type, char or a cell array of strings.


Example

L = kron([1 2 3;3 2...



Often I have to extract a subset of a two-dimensional array for further analysis. Usually I do this with logical indexing. But most often the problem with logical indexing is that I get a column vector which I then have to reshape or index into a...



How much water flows where? Use this algorithm to calculate the upslope area of each cell in a digital elevation model.

Algorithm specifications:
- multiple flow direction
- single flow direction
- routes across flats



variogram calculates the isotropic and anisotropic experimental variogram in various dimensions.

Syntax:
d = variogram(x,y)
d = variogram(x,y,'pn','pv',...)

The function uses parseargs (objectId=10670) by Malcolm...



accumconncomps creates vectors by accumulating elements in one vector using the connected components in another vector of same size. Connected components are regarded as subsequent, identical elements in a vector.

Example:
Sum the...



This function completes what I have started with the functions variogram and variogramfit. It is not intended to be a highly optimized code for performing kriging but may have educational value. Note that for using kriging, you should download the...



The Strahler Stream Order is a way to classify rivers based on a hierarchy of tributaries. First-order streams don't have tributaries. When two first-order streams come together, they form a second-order stream. When two second-order streams come...



variogramfit performs a least squares fit of various theoretical variograms to an experimental, isotropic variogram. The user can choose between various bounded (e.g. spherical) and unbounded (e.g. exponential) models. A nugget variance can be...