# Wolfgang Schwanghart

### University of Postdam

Followers: 0 Following: 0

Professional Interests: GIS, Physical Geography, Hydrology, Geomorphology

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**4** Questions

**41** Answers

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**Feeds**

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...

mer än ett år 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: ...

ungefär 2 år 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 ...

ungefär 2 år 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...

ungefär 2 år 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 ...

ungefär 2 år 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 ...

ungefär 2 år ago | 0

| accepted

Submitted

TopoToolbox

A MATLAB program for the analysis of digital elevation models

ungefär 3 år ago | 94 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...

mer än 3 år 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] ...

mer än 3 år 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.

mer än 3 år 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...

mer än 4 år 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...

ungefär 5 år 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...

nästan 6 år ago | 0

Submitted

Non-crossing polynomial quantile regression

Non-crossing polynomial quantile regression

mer än 8 år ago | 1 download |

Submitted

Flow Accumulation (upslope area)

Flow accumulation algorithm that routes through flats

mer än 9 år ago | 5 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...

ungefär 10 år 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 ...

ungefär 10 år 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...

ungefär 10 år 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 ...

mer än 10 år ago

Solved

Check if equal

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

mer än 10 år ago

Solved

Add a row of zeros on top of a matrix

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

mer än 10 år 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'...

mer än 10 år 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...

mer än 10 år 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 ...

mer än 10 år 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 [...

mer än 10 år 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; ...

mer än 10 år 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...

mer än 10 år ago