Question

Self-Organized Map Gaussian Neighborhood Function

I typically use linkdist when running a SOM in MATLAB, however, the research shows that a Gaussian neighborhood function may oft...

1 year ago | 0 answers | 0

Question

Crop figures or create custom bounding box for geographical data

I would like to eliminate the extra white space within the black boarder of the map created by this particular map projection. M...

2 years ago | 0 answers | 0

Question

Best CPU for large data - Intel i9900k or AMD Threadripper 2950x

I work with large datasets (> 2TB) and have matrices often larger than 1,000,000 x 1,000,000 rows/cols. Computation times are on...

2 years ago | 0 answers | 0

Question

Compute Mode of values in array greater than 0

I need to compute the mode from values in my array (9x9 array) greater than 0. This is because I only care about the values grea...

2 years ago | 1 answer | 0

Question

Circular Indexing of Array

I have a question that has been addressed in some capacity here: https://www.mathworks.com/matlabcentral/answers/44993-circular-...

2 years ago | 1 answer | 0

Question

Connected Component Labeling with Different Pixel/Cell Sizes

I have a 3D matrix ( 73 x 144 x 25738 ) in which I am using the following code to label clusters of pixels, then further group c...

2 years ago | 0 answers | 0

Question

3-Dimensional Clustering

I have a 3D matrix (73 X 144 X 25738) where the first 2 dimensions are data in a lat / long grid and the 3rd dimension is time. ...

2 years ago | 0 answers | 0

Question

Find Natural Breaks in Time Series Data

I need to break my time series data at natural break points, like a Jenks Natural Break in ArcGIS. In the graph, you can clearly...

3 years ago | 2 answers | 0

Question

Z-scores of time series data (temperatures)

I need to compute the z-scores of daily temperature data. My data runs from 1975 - 2010, November - March. Each November - March...

3 years ago | 1 answer | 0

Question

Lagged/Cross Correlations with missing values

I need to compute the cross correlation (up to 7 days lag) for each column in my matrix. However, many of the cells contain miss...

3 years ago | 2 answers | 1

Question

Colormap based on contour values

I want to make my color map such that it uses white for the 0 value and applies a diverging ramp of color (blue and red) for cma...

4 years ago | 1 answer | 0

Question

Array Row Similarity/Comparison

I want to compare rows of two arrays to see which rows are most similar to one another, sort of like clustering. To be clear, I ...

4 years ago | 1 answer | 0

Question

Loop backwards and select subset of rows that meet criteria

I am trying to loop backwards to select rows that meet a certain criteria. The criteria is "t" which is a date. From there I n...

4 years ago | 2 answers | 0

Question

Compute different length mean when cell equals number

I need to compute the mean of "x" number of rows in a column of data when a cell in another column is repeated. For example: I h...

4 years ago | 1 answer | 0

Question

Delete rows from Cell Array

I have a cell array as seen in the image. I want to delete the rows of the cell array where the first column is less than 3. Tha...

4 years ago | 3 answers | 0

Question

Number to string within numeric matrix

I have numbers (1-20) which correspond to a city. I want to convert each number to a string to more easily read the city. For ex...

4 years ago | 4 answers | 0

Question

Combine rows of 2 Matrices based on a columns cell value

I have two matrices. The first matrix "A" has 2 columns and 425 rows of data. Matrix "B" has 10 columns and 468 rows of data. ...

4 years ago | 1 answer | 0

Question

Approximate matching of numbers across 20 Matrices

I have 20 matrices which house multiple columns of data. The first column is the datenum. I need to essentially look through all...

4 years ago | 2 answers | 0

Question

Plot Self Organizing Map Pattern Trajectories

I am using SOMs to represent Sea Level Pressure (SLP) data. I am needing to map trajectories (line vectors to each pattern) of t...

4 years ago | 1 answer | 0

Question

Average of consecutively increasing numbers

I have 4 columns of data in an array. The first three columns are year, month, day. The 4th column is a z-score. I need to compu...

4 years ago | 1 answer | 0

Question

Fill in sequential numbers between two numbers

I have two matrices, A = (1,2,3,4,5) and B = (6,8,14,12,11). I need to generate an array in which all the numbers between A(row,...

4 years ago | 2 answers | 0

Question

Run length of consecutive integers in array

I am working with an array and need to determine the run length of consecutive integers in the 4th column of the array. Here is ...

4 years ago | 2 answers | 0