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How I can use K-fold cross validation for training selection sequentially not randomly?
I suggest identifying each group with a grouping variable. groupID is the grouping variable. % Set these values n = 540; ...

14 days ago | 0

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How to highlight a point?
There are 3 steps to this process. Get the current point of the cursor Find the closest point to the cursor when the cursor i...

15 days ago | 0

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Is it possible to only allow brush to select data from certain lines in a plot?
Set HandleVisibility to off (or callback) for the graphics objects you'd like to hide from the brush tool. Note that this will...

15 days ago | 1

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Answered
Trying to create a table with a char array as variable names
This demo creates the table you described using random text. histcounts is used to count the number of each letter. The counts...

15 days ago | 0

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how do you define a matrix and its variable
Learn about preallocation. Options: i = 4; j = 3; M = nan(i,j) M = ones(i,j) M = zeros(i,j)

15 days ago | 0

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how do i create a concentric black and white circles on a color image with different brightness
This uses the gray colormap. n = 20; % number of circles r = [1,10]; % [smallest, largest] radius center = [0,0]; % cen...

15 days ago | 0

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How do I start a function at the exact computer clock time?
> How do I start a function at the exact computer clock time? It depends on how you define "exact" and "start". If "start" m...

15 days ago | 0

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I have to select mode from matrix with sliding window of 3X3. How to do that?
n*m sliding mode; slides by intervals of 1 This computes the sliding mode within a 2D window that slides by 1 unit horizontally...

15 days ago | 1

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Answered
"Index exceeds the number of array elements (2)" when it shouldn't?
It looks like this for k = (((j - 1)*5000) + 1):(j*5000) a(k) = y(k); end could be replaced with k = (((j - 1)*5000)...

15 days ago | 0

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Answered
How to separate and order timetable data by year
> I now want to be able to obtain a metric for each year and to do this i will need to separate the data into years, keeping th...

15 days ago | 0

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Creating a table with only headers
To create an emtpy table with 4 headers, T = array2table(nan(0,4), 'VariableNames', {'Observations', 'Mean', 'Treatment', 'Res...

15 days ago | 1

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Answered
How to download Matlab Version 2021a
Download previous releases here https://www.mathworks.com/products/new_products/previous_release_overview.html

15 days ago | 0

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How to compare the index values in the different matrices
See isequal. or ismember Demo: a = [2 3 4] b = sqrt(a) ismember(a,b) To understand why your conditional statement does n...

21 days ago | 0

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Answered
How to recursively reduce the function arguments
x1 = rand(1); x2 = rand(1); x3 = rand(1); x4 = rand(1); p = [x1, x2, x3, x4]; f5([p,1]) p = [x1, x2, x3]; f5([p,1]) ...

21 days ago | 0

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How can I plot a 2D variable with a slider for the 3rd dimension?
This demo produces data as you described and a slider is used to select the 3rd dimension of the data to be plotted. data = r...

22 days ago | 0

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Remove the Last Entry of Many Fields of a Structure
dataTrimmed = structfun(@(s)s(1:end-1),data,'UniformOutput',false);

22 days ago | 0

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Why the Vertical Coverage button does not appear in my radar designer app?
The image from the R2021a documentation does not include that button which probably means it became available in R2021b. R20...

22 days ago | 0

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Plot numbers in geoplot
Specifying the coordinates in geoplots can be tricky since. Don't forget that South and West are negative values. See this demo...

22 days ago | 0

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Correlation regression lines between two parameters
Common methods of adding a simple linear regression line 1. Use lsline which will add a regression line for each set of data in...

22 days ago | 1

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How to remove NaN cells inside a structure with several cell arrays inside?
You can't remove the NaN values without changing the shape of the data. You could replace the NaN values with a different place...

22 days ago | 0

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craters
Generates a cratered spherical surface such as a moon or asteroid.

23 days ago | 3 downloads |

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Answered
Link Geoplot zoom to subplots
Yes, this is complicated. The goal would be to link the axis limits (linaxes) but ... Latitude in non-linear in geoaxes The...

23 days ago | 1

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How to extract certain values in an array
Use datetime values instead of any other form of date/time. That allows you to easily index by hour etc. % Load the data ...

29 days ago | 1

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Answered
How do you set a default datatip callback function?
> I'm trying to add callback code to a scatterplot that activates when the use clicks on a data point > I want to set a default...

29 days ago | 0

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How do you set a default datatip callback function?
It doesn't appear that there is a factory CreateFcn for Data Tips and its default value is an empty character array (''). The ...

1 month ago | 1

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Copy axes to uiaxes
Use copyobj instead to copy the entire external axes to a uipanel in your app. Demo: % Simulate the app with a uifigure and ...

1 month ago | 0

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bootstrap regression giving 2 different answers, not sure why
According to the bootstrp documentation, bootfun should be a function handle but bootstrp merely calls feval which accepts chara...

2 months ago | 0

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fprint f help with printing a list
In Matlab R2021a or later, you can use formattedDisplayText() to convert the matrix to a string. See this community highlight f...

2 months ago | 0

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How to select multiple sets of data points from a scatter plot (like gating in flow cytometry/cell sorting)?
Using the slope and y-intercept of each reference line, determine which points contain y-values less than the upper line and whi...

2 months ago | 0

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Answered
How to create an image that has random chunks of black and white pixels
Specify imageSize and blockScale to create randomly placed blocks of black and white pixels. imageSize = [1920,1080]; ...

2 months ago | 0

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