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George

MathWorks

Last seen: 2 years 前 |  自 2014 起处于活动状态

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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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已回答
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 前 | 1

已回答
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 前 | 1

| 已接受

已回答
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 前 | 0

已回答
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 前 | 0

| 已接受

已回答
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 前 | 0

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

8 years 前 | 0

已回答
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 前 | 0

已回答
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 前 | 0

已回答
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 前 | 0

已回答
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 前 | 0

已回答
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 前 | 1

| 已接受

已回答
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 前 | 2

| 已接受

已回答
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 前 | 0

已回答
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 前 | 0

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

8 years 前 | 1

| 已接受

已回答
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 前 | 3

| 已接受

已回答
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 前 | 0

已回答
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 前 | 0

已回答
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 前 | 0

已回答
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 前 | 0

已回答
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 前 | 2

| 已接受

已回答
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 前 | 0

已回答
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 前 | 0

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

8 years 前 | 1

已回答
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 前 | 0

已回答
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 前 | 5

| 已接受

已回答
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 前 | 0

已回答
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 前 | 0

已回答
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 前 | 0

已回答
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 前 | 0

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