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Justin


Controls and Data Services Inc

53 total contributions since 2014

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Answered
How can I eliminate unwanted zeros from a matrix?
It depends on what you are trying to end up with exactly but a good approach would be to set all zero values to NaN. NaNs wont ...

3 years ago | 2

Answered
2014b Subplot legend zoom error
Hi Lena. I got a response from mathworks that states the following: Hello Justin, I am writing in reference to your ...

4 years ago | 1

| accepted

Solved


Pattern matching
Given a matrix, m-by-n, find all the rows that have the same "increase, decrease, or stay same" pattern going across the columns...

5 years ago

Solved


Who Has the Most Change?
You have a matrix for which each row is a person and the columns represent the number of quarters, nickels, dimes, and pennies t...

5 years ago

Solved


What is the next step in Conway's Life?
Given a matrix A that represents the state of <http://en.wikipedia.org/wiki/Conway's_Game_of_Life Conway's game of Life> at one ...

5 years ago

Solved


Return the 3n+1 sequence for n
A Collatz sequence is the sequence where, for a given number n, the next number in the sequence is either n/2 if the number is e...

5 years ago

Solved


Back and Forth Rows
Given a number n, create an n-by-n matrix in which the integers from 1 to n^2 wind back and forth along the rows as shown in the...

5 years ago

Solved


Find the numeric mean of the prime numbers in a matrix.
There will always be at least one prime in the matrix. Example: Input in = [ 8 3 5 9 ] Output out is 4...

5 years ago

Answered
Solve equation with 2 variables being vectors
Edited for clarification: This may do the trick. It has a loop but only one for implementing the function. After it is run ...

5 years ago | 0

Answered
Slider Event Listener Creates a new figure instead of updating Existing figure.
Hello :) I don't have the image processing toolbox but I believe imshow will work similar to some other functions. You shoul...

5 years ago | 1

| accepted

Solved


Most nonzero elements in row
Given the matrix a, return the index r of the row with the most nonzero elements. Assume there will always be exactly one row th...

5 years ago

Answered
Plotting multiple figures from a for loop on the same graph
I'm not sure I understand exactly what you are trying to get but I will try to help. Matlab nomenclature usually refers to th...

5 years ago | 2

Answered
How can I eliminate the following error?
The problem comes in when you are defining your M as an array of doubles before the loop. I would make sure there exists no M i...

5 years ago | 2

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Answered
How do I disable the new pop-up command history window?
One way is to press the up arrow in the command window so the history shows up. Then you can right click the bar on the top of ...

5 years ago | 4

| accepted

Answered
Converting Cell to Double
There may be a better way to import the text file so the data is automatically read in as numeric values. Try using the Import ...

5 years ago | 0

| accepted

Answered
How to create a matrix of four dimensions in which the fourth dimension is not fixed?jkjsdfhlksdjhf
If you don't need to compile your code Matlab is very flexible with array sizes. For example if you have A = zeros([2 2]); you ...

5 years ago | 0

Answered
How to track numbers in the MATLAB excel sheet?
I believe the correct name for what you are referring to as the Matlab excel sheet is called the Variable Editor. A simple an...

5 years ago | 0

Answered
How to speed up the following code. I need to optimize it for fastest performance in Matlab 7.0 version
What is lat_BOX and lon_BOX and where are m and n defined? Also, what is the concept of what the conditional statements are app...

5 years ago | 0

Answered
Finding x-values from found y-values
If I understand the question correctly you want may just be able to use <http://www.mathworks.com/help/matlab/ref/ginput.html gi...

5 years ago | 0

Answered
How to pick the j-th percentile of a vector?
Is the function <http://www.mathworks.com/help/stats/prctile.html prctile> what you are looking for? It is in the statistics ...

5 years ago | 0

Answered
Interpreting varargin name-value pairs.
I'm always a fan of cellfun. inputExist = find(cellfun(@(x) strcmpi(x, 'fontname') , varargin)); if inputExist font...

5 years ago | 0

Solved


Finding Perfect Squares
Given a vector of numbers, return true if one of the numbers is a square of one of the other numbers. Otherwise return false. E...

5 years ago

Answered
problem for creating vector with for loop
This is not a difficult task to do but does take a little extra planning in how to index the first array. I'll give you an ex...

5 years ago | 0

Solved


Is my wife right?
Regardless of input, output the string 'yes'.

5 years ago

Solved


Spot the outlier
All points except for one lie on a line. Which one is the outlier? Example: You are given a list of x-y pairs in a column ...

5 years ago

Solved


Find a subset that divides the vector into equal halves
Given a vector x, return the indices to elements that will sum to exactly half of the sum of all elements. Example: Inpu...

5 years ago

Solved


Which doors are open?
There are n doors in an alley. Initially they are all shut. You have been tasked to go down the alley n times, and open/shut the...

5 years ago

Solved


Find common elements in matrix rows
Given a matrix, find all elements that exist in every row. For example, given A = 1 2 3 5 9 2 5 9 3 2 5 9 ...

5 years ago

Solved


Renaming a field in a structure array
MATLAB has a <http://www.mathworks.com/help/techdoc/ref/setfield.html setfield> and a <http://www.mathworks.com/help/techdoc/ref...

5 years ago

Solved


Test for balanced parentheses
Given the input inStr, give the boolean output out indicating whether all the parentheses are balanced. Examples: * If ...

5 years ago

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