# George

### MathWorks

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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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Submitted

dotenv-for-MATLAB

Load environment variables from a .env file.

10 months ago | 4 downloads |

Solved

Magic is simple (for beginners)

Determine for a magic square of order n, the magic sum m. For example m=15 for a magic square of order 3.

3 years ago

Solved

Make a random, non-repeating vector.

This is a basic MATLAB operation. It is for instructional purposes. --- If you want to get a random permutation of integer...

3 years ago

Solved

Generate a vector like 1,2,2,3,3,3,4,4,4,4

Generate a vector like 1,2,2,3,3,3,4,4,4,4 So if n = 3, then return [1 2 2 3 3 3] And if n = 5, then return [1 2 2...

3 years ago

Solved

Number of 1s in a binary string

Find the number of 1s in the given binary string. Example. If the input string is '1100101', the output is 4. If the input stri...

3 years ago

Solved

Getting the indices from a vector

This is a basic MATLAB operation. It is for instructional purposes. --- You may already know how to <http://www.mathworks....

3 years ago

Solved

Maximum value in a matrix

Find the maximum value in the given matrix. For example, if A = [1 2 3; 4 7 8; 0 9 1]; then the answer is 9.

3 years ago

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...

7 years 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...

7 years 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...

7 years 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...

7 years 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...

7 years ago | 1

| 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...

7 years 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...

7 years ago | 0

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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...

7 years ago | 0

predict data for input

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

7 years 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...

7 years 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; ...

7 years ago | 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.

7 years 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, ...

7 years 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...

7 years ago

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...

7 years 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...

7 years 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...

7 years 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...

7 years 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/...

7 years 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 ...

7 years 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...

7 years ago | 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...

7 years ago | 0