Community Profile

# George

### MathWorks

174 total contributions since 2014

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

View details...

Contributions in
View by

Submitted

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

Solved

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...

mehr als 3 Jahre ago

Solved

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...

mehr als 3 Jahre ago

Solved

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...

mehr als 3 Jahre ago

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...

mehr als 3 Jahre ago | 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...

mehr als 3 Jahre ago | 0

| accepted

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...

mehr als 3 Jahre ago | 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...

mehr als 3 Jahre ago | 0

| accepted

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

fast 4 Jahre ago | 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...

fast 4 Jahre ago | 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; ...

fast 4 Jahre ago | 0

Solved

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, ...

fast 4 Jahre ago

Solved

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...

fast 4 Jahre ago

How to remove corrupted data lines from text file

fast 4 Jahre ago | 0

Solved

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...

fast 4 Jahre ago

Solved

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...

fast 4 Jahre ago

Solved

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...

fast 4 Jahre ago

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/...

fast 4 Jahre ago | 1

| accepted

Solved

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 ...

fast 4 Jahre ago

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...

fast 4 Jahre ago | 2

| accepted

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...

fast 4 Jahre ago | 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...

fast 4 Jahre ago | 0

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

fast 4 Jahre ago | 1

| accepted

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...

fast 4 Jahre ago | 3

| accepted

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...

fast 4 Jahre ago | 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.

fast 4 Jahre ago | 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>.

fast 4 Jahre ago | 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...

fast 4 Jahre ago | 0