# Wolfgang Schwanghart

### University of Postdam

Professional Interests: GIS, Physical Geography, Hydrology, Geomorphology

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**4** Questions

**41** Answers

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**Content Feed**

Question

Does imread read subsets from cloud-optimized geotiffs

Hi, cloud-optimized geotiff (COG) is a format to work with spatial raster data in the cloud (https://www.cogeo.org/). I am curr...

1 year ago | 1 answer | 0

### 1

answerSolved

Create a cell array out of a struct

Create a cell array out of a (single) struct with the fieldname in the first column and the value in the second column: in: ...

1 year ago

Solved

Flip the vector from right to left

Flip the vector from right to left. Examples x=[1:5], then y=[5 4 3 2 1] x=[1 4 6], then y=[6 4 1]; Request not ...

1 year ago

Solved

Generate a vector like 1,2,2,3,3,3,4,4,4,4

Generate a vector like 1,2,2,3,3,3,4,4,4,4 So if n = 3, then return [1 2 2 3 3 3] And if n = 5, then return [1 2 2...

1 year ago

Plot line with points at given distance

Since you are working with TopoToolbox, you might want to use the function getlocation. If you have a STREAMobj S, then you can ...

2 years ago | 0

| accepted

Inverse distance weighting based on direction

Hi Christian, interesting question. First of all, if you follow the IDW-approach, you might save a lot of computing time using ...

2 years ago | 0

| accepted

Submitted

TopoToolbox

A MATLAB program for the analysis of digital elevation models

2 years ago | 82 downloads |

Solved

Create an n-by-n null matrix and fill with ones certain positions

The positions will be indicated by a z-by-2 matrix. Each row in this z-by-2 matrix will have the row and column in which a 1 has...

3 years ago

Solved

Symmetry of vector

Determine whether the vector is symmetric or not (vector could be even or odd in length). For example: x = [1 2 3 3 2 1] ...

3 years ago

Solved

Vector creation

Create a vector using square brackets going from 1 to the given value x in steps on 1. Hint: use increment.

3 years ago

Question

Fit Gaussian mixture model with weighted observations

Hi everyone, looking at the help of fitgmdist, I cannot see that there is the possibility to weight observations. Is there a rea...

4 years ago | 3 answers | 0

### 3

answers2D gaussian filter with a variable sigma

Hi Chad, below is some code that does the trick using nlfilter. To be more efficient, I created a look-up table with a finite s...

4 years ago | 0

What makes a Toolbox a Toolbox, and how is it recognized by Matlab?

Hi Chad, the trick is to have a Contents.m-file in the main folder of your toolbox. In TopoToolbox, the file starts with T...

5 years ago | 0

Submitted

Non-crossing polynomial quantile regression

Non-crossing polynomial quantile regression

8 years ago | 1 download |

Submitted

Flow Accumulation (upslope area)

Flow accumulation algorithm that routes through flats

9 years ago | 6 downloads |

Question

Customized icons in workspace

Hi all, I have written a couple of MATLAB classes and, as icing on the cake, I'd like to have customized icons in the worksp...

9 years ago | 0 answers | 1

### 0

answersSolved

index of n in magic(n)

let input=5; magic matrix 17 24 1 8 15 23 5 7 14 16 4 6 13 20 22 ...

10 years ago

Solved

Order of things - 1

Let's assume you have a number of calculations to perform, that depend on each other. E.g. 'A' can be calculated, once the outco...

10 years ago

Solved

Count decimal digits of a number

* Given an integer number you have to return the number of its digits. * For example 248 has 3 digits and 1589 has 4 digits ...

10 years ago

Solved

Check if equal

Return true if all the elements of an nD array are equal, false otherwise.

10 years ago

Solved

Add a row of zeros on top of a matrix

Given a matrix, insert a row of zeros as the top row.

10 years ago

Solved

Too Many Zeros, Dump Them!

Sometimes when I create a matrix, I use this syntax: a = zeros(1000,1000); But when the function ends, I find that I don'...

10 years ago

Solved

Enlarge array

Given an mxn numeric array (A) and a 1x2 vector (sz) indicating the dimensions [p q] to enlarge each element, return an (m*p)x(n...

10 years ago

Solved

Pascal's pyramid

In Pascal's triangle each number is the sum of the two nearest numbers in the line above: 1 1 1 ...

10 years ago

Solved

Create an index-powered vector

Given a input vector x, return y as index-powered vector as shown below. Example x = [2 3 6 9] then y should be [...

10 years ago

Solved

Matrix to column conversion

Given a matrix of any size, convert it into a column vector. e.g A=[10 20 30; 40 50 60] then, B = [10; 40; ...

10 years ago

Solved

Find the index of the largest value in any vector X=[4,3,4,5,9,12,0,4.....5]

The given function returns the index of the maximum value in a given matrix. such as X=[4,3,4,5,9,12,0,5] Ans= 6 if maxim...

10 years ago