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Cris LaPierre


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MathWorks

906 total contributions since 2018

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Answered
Beginner: Using SURF Function, Error: Z must be a matrix, not a scalar or vector.
A surface is a 3D plot. All your X values are repeated for every Y value, and vice versa, meaning the surface is 5001 x 5001. Su...

12 hours ago | 0

Answered
Asterisk wildcard doesn't work with fullfile
I mocked up a folder inside my current directory named "Test02_20200522" with contents "file1_100MVC.otb+" to "file4_100MVC.otb+...

17 hours ago | 0

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Answered
Segmenting EEG data into 1 second segments
The issue is the curly braces. Use parentheses instead. for i=1:600 tsout(i) = getsampleusingtime(ts,i-1,i); end

17 hours ago | 0

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How to pass variable from .m file to appdesigner?
I would suggest turning your m-file into a function that returns data as a function output. Then you can call your function from...

1 day ago | 0

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Answered
how to count data frequency by year and month?
Easier to help if you share your data. Convert your station name and station code to categoricals. Convert your time to datetim...

1 day ago | 1

Answered
How to make an histogram for month with datetime series, the data is windvelocity for a 1 year?
I don't think you want to do histograms. Try a boxplot instead. Boxplots convey information about the spread of the data, but in...

1 day ago | 0

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Answered
importdata cuts my files in half!
When I open the file you have attached (outside MATLAB), it only contains 2500 rows. Perhaps you meant to attach a different fil...

1 day ago | 0

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Find all integer values contained within an irregular volume
I wonder if the functions inpolygon and inpolyhedron might be helpful here. See this post about finding the points inside a 3D v...

2 days ago | 0

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Bin edges of discretize function excluding some bins
mtransf(102,:) = discretize(mtransf(101,:),binEgdes,"Categorical",catnames); mtransf(102,mtransf(102,:)==4)=NaN;

2 days ago | 0

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Answered
Find/return value from each row in a big matrix that corresponds with a condition/value
Is the order of the resulting vector important? You can just do a normal equality comparison, then use any to create a logical ...

2 days ago | 0

Answered
How to make a new matrix out of the combination of 12 matrix
use indexing. A = zeros(401,101); B = ones(401,101); C = [A(:,[1 3 5]), B(:,[10 20 20])];

2 days ago | 0

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Exporting matrix as .txt file
The best approach would be to define a variable for each format specified in your fprintf statement. Without it, MATLAB, which i...

2 days ago | 0

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How to reorganize the data in table?
Use groupsummary. Group the data first by E then by M. Groupsummary will tell you the count of each group. Here's an example usi...

3 days ago | 1

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Answered
AppDesigner GUI Inexplicably Moving Components
I was able to open and close your app several times without seeing the issue you are describing. If you are still seeing it, I s...

3 days ago | 0

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Answered
Read data from editing text in GUI
Keep in mind variable scope for functions. Look at the inputs to your function rhs function dxdt=rhs(t,x) The handles structur...

3 days ago | 0

Answered
undefined variable even with equal sign, tried to see if it was the () but no luck
EVS is only defined in the case where n>=3 (btw, you don't need the parentheses around n and 3). What is your value of n? If it'...

3 days ago | 0

Answered
Plotting graph with excel file
We'll have to make some assumptions, since we don't have all the details. I'm going to assume your data is in a table with 3 va...

6 days ago | 0

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Scaling of one axis only in 2D plot
Set the position property. See this post.

6 days ago | 0

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Answered
I need an established reference on optimizing Matlab code.
Not sure if this is what you are looking for, but here are some resources I'm aware of: MATLAB Performance Optimization Perfor...

6 days ago | 0

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Answered
Add text to column numbers in variables editor
I'm fairly certain only tables can have named columns. A similar post can be seen here.

7 days ago | 0

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Answered
How to prepare imagedatastore for Image to single value regression
Let's fix the error first. What is Y_train? Converting it to categorical is simple enough. Y_train = categorical(Y_train); Wit...

7 days ago | 0

Answered
detecting and removing eye blinks from 4-channel EEG signal
We don't have nearly enough information to help you. However, you might try using the Find Local Maxima and Minima task in the l...

7 days ago | 0

Answered
Z must be a matrix, not scalar or vector
z needs to be the same size as X and Y. Perhaps you mean to do something like this? t=linspace(0, 2*pi); T = meshgrid(t); x=2...

8 days ago | 1

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Answered
How to remove first 19 rows from a multidimensional cell array
Use a cellfun. % Setup A(1)={rand(100,10)}; A(2)={rand(100,11)}; A(3)={rand(100,10)}; A(4)={rand(100,15)}; % Remove firs...

8 days ago | 0

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Answered
RE-use helper function on multiple GUI components
Since the app structure is a structure, you can dynamically set the field names. There are a couple ways you could do it. Here's...

8 days ago | 1

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Answered
How to make a zoom in y map in MATLAB Visualizations Custom
Can you add this to your code? geolimits([-12.210 -11.923],[-77.306 -76.936])

8 days ago | 0

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Offline execution of a program in MATLAB online
You need to maintain an active connection or your session will time out. See Hisham's reply here.

8 days ago | 0

Answered
For loop is not working
A loop runs the same code over and over. That means you overwrite your variables each time. As you've written it, the result wil...

8 days ago | 0

Answered
overlaying 3 contourf plots into 1 figure.
All 3 contourf plots are there. You can verify this with the plot browser. You do only see the one that was plotted last. The le...

8 days ago | 0

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Answered
Put data into bins with pre-specified intervals
Use histcounts and specify the bin edges using the syntax [N,edges] = histcounts(X,edges)

8 days ago | 0

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