George

MathWorks

Last seen: 2 years ago | Active since 2014

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I've worked at MathWorks since 2013. Using MATLAB isn't part of my job, but I enjoy learning about it.

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How can I create a cell array by combining arrays?
What are you having trouble with? The code you posted works. >> cellArray={['X','Y','Z'],[1 2 3],[4 5 6],[7 8 9]} c...

8 years ago | 1

Answered
Using save with -v7.3 takes a long time and the mat file size is enormous
I've run into this before too. From the <https://www.mathworks.com/help/matlab/import_export/mat-file-versions.html matfile> pag...

8 years ago | 1

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Answered
How do I get Matlab to recognise a text file as numerical values when importing it ?
Check out the <https://www.mathworks.com/help/matlab/ref/textscan.html#inputarg_formatSpec |formatSpec|> portion of the textscan...

8 years ago | 0

Answered
how to get the specific member data from a struct array?
From the doc on <https://www.mathworks.com/help/matlab/ref/struct.html |struct|> "When you access a field of a nonscalar stru...

8 years ago | 0

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Answered
Can anybody help me in writing MATLAB code?i have an .xls file of 2950 sequence .i want a function to read my file and select sequence 1,11,21,31 and write it on another new .xls file, then select 2,12,22 and similarly uptill 10,20,30...etc
% Pseudocode T = readtable('file.xlsx'); for ii=1:10 rows = ii:10:height(T); writetable(T(rows,:), ['fil...

8 years ago | 0

Answered
predict data for input
Have you tried <https://www.mathworks.com/help/stats/compactclassificationdiscriminant.predict.html |predict()|>? results =...

8 years ago | 0

Answered
I'm trying to create a loop in which i can extract 4 columns and multiple rows from 18 difference txt files and save the extracted data in one file. Is this possible? This is my code from one file
Untested, but this should basically work. Get an array of filenames with <https://www.mathworks.com/help/matlab/ref/ls.html?s_ti...

8 years ago | 0

Answered
How can I make a random array with values of either -1 or 1?
You can use rand % pseudo code x = rand(50,1); pos = x >= .5; neg = x < .5; x(pos) = 1; x(neg) = -1; ...

8 years ago | 0

Answered
I'm doing iteration of credit card. In it, there are looping of month ,balance, and pay every month . How to plot graph with these three variable as the value changes everytime looping happen . Thanks
Don't try and plot it everytime it changes. Store the elements in vectors and plot those at the end.

8 years ago | 0

Answered
How to remove corrupted data lines from text file
Add a NameValue pair of <https://www.mathworks.com/help/matlab/ref/textscan.html#namevaluepairs CommentStyle>. e.g., C = t...

8 years ago | 0

Answered
How to set names to column vectors?
If you want to associate a variable name with a piece of data I think your best bet is to use a <https://www.mathworks.com/help/...

8 years ago | 1

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Answered
How to speed up a for loop ?
Are you sure this is correct? angle=asin(A(:,3))/(sqrt(A(:,3).^2+A(:,2).^2+A(:,1).^2)); That's doing matrix division. In...

8 years ago | 2

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Answered
How to find which column consists character 'example' in cell c{1,2}(:,1)
strcmp(c{1,2}(:,1), 'example') will return a logical array. You may need to surround 'example' with |cellstr()|, I can't re...

8 years ago | 0

Answered
how to convert minute rainfall to daily rainfall with missing value?
This assumes you can get the data into the tables you want. Here is a way if you have data in one station per file. ds = da...

8 years ago | 0

Answered
Replace a missing string in a table
This should work: dblVar = [NaN; 3; 7; 9]; cellstrVar = {'one'; 'three'; ''; 'nine'}; categoryVar = categorical({''; ...

8 years ago | 1

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Answered
How to process multiple txt files in a loop?
Get an array of file names and loop over that array. e.g., files = ['file1.txt' 'file2.txt' 'file3.txt']; for ii = 1:nu...

8 years ago | 3

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Answered
How do I calculate a mean value of a vector and ignore from the "0" when appears inside the vectors?
Replacing the 0s with NaN and using the 'omitnan' flag should do what you want. >> A A = NaN NaN...

8 years ago | 0

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How can i rotate Confusion Matrix?
ax = gca; ax.XAxisLocation = 'top'; You can also do this with the set command, but I think the above is more clear.

8 years ago | 0

Answered
Merge Date and Time in Tall Tables
Try adding them together. <https://in.mathworks.com/help/matlab/matlab_prog/compute-elapsed-time.html Examples>.

8 years ago | 0

Answered
Extract values from single data matrix
Take a look at <https://www.mathworks.com/help/matlab/ref/horzcat.html |horzcat|> and <https://www.mathworks.com/help/matlab/ref...

8 years ago | 0

Answered
How can I count frequency in array?
<https://www.mathworks.com/help/matlab/ref/fprintf.html |fprintf|> prints to a file. You want to use <https://www.mathworks.com/...

8 years ago | 2

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Answered
find the matching strings in tables
You can use <https://www.mathworks.com/help/matlab/ref/regexp.html |regexp|>. a = 'Country1-Area1,CityA-52'; expression ...

8 years ago | 0

Answered
help! writing afunction for isprime
Do you know how to test whether a number is prime? Here is one way you can start: # Generate numbers between 2:(n/2) # Test ...

8 years ago | 0

Answered
How to read images in a folder
You can try <https://www.mathworks.com/help/matlab/ref/imagedatastore-object.html |ImageDatastore|>

8 years ago | 1

Answered
How convert date and time to number that excel will recognize the really date and time?
Use <https://www.mathworks.com/help/matlab/ref/datetime.html |datetime|> and <https://www.mathworks.com/help/matlab/ref/writetab...

8 years ago | 0

Answered
Find index with multiple condition, using find function
The first thing I would try is to be more liberal with your use of parenthesis. In your statement: index = find(datachunk...

8 years ago | 5

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Answered
How I can eliminate days with incomplete hours?
You can do this with <https://www.mathworks.com/help/matlab/ref/findgroups.html |findgroups()|> and <https://www.mathworks.com/h...

8 years ago | 0

Answered
Error installing Python on Matlab
Assuming that you're trying to execute the python command this won't work: cd "matlabroot\extern\engines\python" python...

8 years ago | 0

Answered
Applying function to cell array
Define a <https://www.mathworks.com/help/matlab/matlab_prog/creating-a-function-handle.html function handle> and use that as an ...

8 years ago | 0

Answered
How can I remove elements divisible by 3,4, and 5 in a vector?
You can do this using <https://www.mathworks.com/help/matlab/ref/mod.html |mod()|>.

8 years ago | 0

George

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