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Leon


NOAA

Last seen: 1 day ago Active since 2011

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Question


How do I get values of a certain parameter in a multi-dimensional matrix?
A is a variable with the size of 1000 x 500. % Index of those that are less than 10000 Ind = A < 10000; Why does the below gi...

3 days ago | 2 answers | 0

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answers

Question


How to convert the below colormap into a Matlab colormap?
Below is a topography colormap I got from the Generic Mapping Tools. I wonder if anyone knows how to convert this colormap into ...

1 month ago | 1 answer | 0

1

answer

Question


Does the latest version of Matlab allow more than one colormaps in one plot?
In the past, overlaying two axes was the only option, but overlaying can often causes its own problems, e.g., slight offset, etc...

1 month ago | 1 answer | 0

1

answer

Question


GMT colormap "geo"
Anyone knows how to extract the numerical values out of the "geo" colormap in the "Generic Mapping Toolbox"? https://gmt-tutori...

1 month ago | 1 answer | 0

1

answer

Question


How to plot a map like this in Matlab?
The attached map was created using GMT based on the Earth Relief data. I wonder if anyone knows how to plot it using Matlab? Ma...

1 month ago | 1 answer | 0

1

answer

Question


Is Matlab compatible with Mac OS Monterey?
I plan to upgrade my Mac OS to the latest Mac OS Montere. I wonder if that will cause any issues? I'm currently on MATLAB R20...

1 month ago | 1 answer | 0

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answer

Question


How do I identify unique rows based on multiple columns and calculate the average of the rest of the columns?
I have a matrix as below: A = [1 4 3 8; 4 5 6 9; 1 6 3 6; 2 6 9 3; 1 5 3 7]; My goal is to identify rows with both identical C...

2 months ago | 1 answer | 0

1

answer

Question


How to expand a table with more columns?
I have a table T1 with a size of 30000 x 55. How do I add 6 more columns of this table: A, B, C, D, E, F, each of them have a s...

2 months ago | 1 answer | 0

1

answer

Question


How to calculate the binned average at the center of each X and Y grid points?
I have a grid like the below and a 3-column data: x, y, z. [X Y] = ndgrid([-179.5:179.5], [-89.5:89.5]); How do I calculate t...

2 months ago | 1 answer | 0

1

answer

Question


How to specify the color of this contourf plot?
I'm trying to plot the landmask (logical 0 or 1) using a uniform color. Below is my code: % Turning the landmask from logical t...

3 months ago | 1 answer | 0

1

answer

Question


How to create a land/sea mask based on an XYZ bathymetry database?
I have a gridded global bathymetric database with X, Y, and E. X is longitude, Y is latitude, and E is the elevation. E can be p...

3 months ago | 1 answer | 0

1

answer

Question


Export a plot with predefined margins
I'm using the below command to export my plot into a jpeg file: % h is the handle for the figure % File_W is my jpeg file name...

3 months ago | 1 answer | 0

1

answer

Question


Creating depth specific contours from bathymetry data
The bathymetric data are available through NetCDF, Data GeoTiff and ESRI ASCII raster formats: https://www.gebco.net/data_and_pr...

3 months ago | 1 answer | 0

1

answer

Question


Calculation using matrix indexing for elements with a certain thresholds
I need to calculate the percentage differences of all elements that are larger than 5 in two matrices (A and B). Both A and B ha...

3 months ago | 1 answer | 0

1

answer

Question


Matlab parfor transparency violation error.
It is my first time to use Matlab parfor, and I'm getting the transparency violation error as below: Error using A02_use (line ...

4 months ago | 0 answers | 0

0

answers

Answered
How to write a parallel computing script for this situation?
Many thanks for the input, John! To clarify, the function is not my code. It is a peer-reviewed one from someone else. Were ...

4 months ago | 0

Question


How to write a parallel computing script for this situation?
I have a program that has been running for more than a week. I have no idea how many additional days it will take. Would anyone ...

4 months ago | 1 answer | 0

1

answer

Question


How to read this kind of info out of a txt file and post them into Excel files?
I receive the below info from emails and would store them into an txt file named FmEmail.txt. The info is composed of several gr...

7 months ago | 1 answer | 0

1

answer

Question


Need help using contourfm in Map plotting
Normally, I can use contourf to plot a countour like this: [C1, h1] = contourf (X, Y, Z, [7.9:0.005:8.2], 'LineStyle', 'none' )...

8 months ago | 1 answer | 0

1

answer

Question


How to blank a grid value with a boundary file?
I have a grid like the below: [X, Y] = ndgrid([-180:0.25:179.75],[-90:0.25:89.75]); Z = griddata(...); %on the same grid as X ...

8 months ago | 1 answer | 0

1

answer

Question


How to find the nearby sampling stations
I have millions of samping sations, my goal is to find the nearby stations with a certain distance threshold. What is the best w...

8 months ago | 1 answer | 0

1

answer

Question


How to convert arc length to km?
My goal is to find a good function to calculate the distance for two points for millions of data points. I found the fucntion ll...

8 months ago | 1 answer | 0

1

answer

Question


How to create a callback for radio buttons
I have a group of radio buttons with 3 choices (app.mode1, app.mode2, and app.mode3) in app-designer. When a user clicks one of ...

9 months ago | 1 answer | 0

1

answer

Question


How to change the button names depending on different situations?
I'm referring to buttons within app-designer. For example, I would want the button to be called "load" in one situation, and "p...

9 months ago | 1 answer | 0

1

answer

Answered
Matlab textArea automatic new line issue
It turns out that the issue are the square brackets. Once I replace them with strcat, everything works perfectly now. Before: ...

9 months ago | 1

| accepted

Question


Limits of app-designer spinner input field
I have an app-designer spinner input field called app.A. I can set its limits by below: app.A.Limits = [1, max(cruiseList)]; H...

9 months ago | 1 answer | 0

1

answer

Question


How to find the index of a column data whose values are equal to another column data?
For example: A = [31; 2; 57; 36; 87; 36]; B = [2; 36]; My goal is to find the inex of all the column A that are equal to any ...

9 months ago | 1 answer | 0

1

answer

Question


Matlab textArea automatic new line issue
I'm trying to generate a list of items. For each research cruise, its Year, Month, Day, Longitude, Latitude, etc. should all be ...

9 months ago | 2 answers | 0

2

answers

Question


How to establish the handle value of a personalized plot function?
I need to develop a program that will: (a) plot one set of data into a figure at a time, (b) when the next set of data is plot...

9 months ago | 1 answer | 0

1

answer

Question


How to write this line of code to create a Matlab table?
I have unknown number of column variables in cell array: Var{1} = [ 1; 2; 3; 4; 7]; Var{2} = [33; 10; 46; 7; 2]; ... If I kn...

12 months ago | 1 answer | 0

1

answer

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