Community Profile

# George

### MathWorks

174 2014 年以降の合計貢献数

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

#### George's バッジ

dotenv-for-MATLAB
Load environment variables from a .env file.

Return unique values without sorting
If the input vector A is [42 1 1], the output value B must be the unique values [42 1] The *values of B are in the s...

3年以上 前

Generate N equally spaced intervals between -L and L
Given N and L, return a list of numbers (in ascending order) that divides the interval [-L L] into N equal-length segments. F...

3年以上 前

Set the array elements whose value is 13 to 0
Input A either an array or a vector (which can be empty) Output B will be the same size as A . All elements of A equal to 13...

3年以上 前

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...

3年以上 前 | 1

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...

3年以上 前 | 0

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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...

3年以上 前 | 0

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...

3年以上 前 | 0

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

3年以上 前 | 0

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...

3年以上 前 | 0

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; ...

3年以上 前 | 0

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.

3年以上 前 | 0

Elapsed Time
Given two date strings d1 and d2 of the form yyyy/mm/dd HH:MM:SS (assume hours HH is in 24 hour mode), determine how much time, ...

3年以上 前

Binary numbers
Given a positive, scalar integer n, create a (2^n)-by-n double-precision matrix containing the binary numbers from 0 through 2^n...

3年以上 前

How to remove corrupted data lines from text file

3年以上 前 | 0

Counting Money
Add the numbers given in the cell array of strings. The strings represent amounts of money using this notation: \$99,999.99. E...

3年以上 前

Sums with Excluded Digits
Add all the integers from 1 to n in which the digit m does not appear. m will always be a single digit integer from 0 to 9. no...

3年以上 前

Multielement indexing of a row array
The row array birthRateChina stores the China birth rate (per 1000 people) for years 2000 to 2012. Write a statement that create...

3年以上 前

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/...

3年以上 前 | 1

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Replace NaNs with the number that appears to its left in the row.
Replace NaNs with the number that appears to its left in the row. If there are more than one consecutive NaNs, they should all ...

3年以上 前

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...

3年以上 前 | 2

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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...

3年以上 前 | 0

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...

3年以上 前 | 0

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

3年以上 前 | 1

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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...

3年以上 前 | 3

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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...

3年以上 前 | 0

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.

3年以上 前 | 0

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

3年以上 前 | 0

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...

3年以上 前 | 0