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Nathan Greco


Active since 2011

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Basic arrays operations.
Apply element-by-element binary operation 'fun' to two arrays (A and B).

5 years ago

Solved


Deleting an element in a matrix
For vector Grades=[98 56 78 34 100 88 87], delete the number 78 to get the following matrix Grades=[98 56 34 100 88 87] **re...

5 years ago

Solved


Fibonacci sequence
Calculate the nth Fibonacci number. Given n, return f where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2, ... Examples: Inpu...

5 years ago

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...

6 years ago

Solved


Weighted average
Given two lists of numbers, determine the weighted average. Example [1 2 3] and [10 15 20] should result in 33.333...

6 years ago

Solved


Triangle Numbers
Triangle numbers are the sums of successive integers. So 6 is a triangle number because 6 = 1 + 2 + 3 which can be displa...

6 years ago

Solved


Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

6 years ago

Solved


Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

10 years ago

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...

10 years ago

Solved


Determine whether a vector is monotonically increasing
Return true if the elements of the input vector increase monotonically (i.e. each element is larger than the previous). Return f...

10 years ago

Solved


Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

10 years ago

Solved


Swap the first and last columns
Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All oth...

10 years ago

Solved


Make a checkerboard matrix
Given an integer n, make an n-by-n matrix made up of alternating ones and zeros as shown below. The a(1,1) should be 1. Example...

10 years ago

Solved


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

10 years ago

Solved


Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; and ...

10 years ago

Solved


Determine if input is odd
Given the input n, return true if n is odd or false if n is even.

10 years ago

Solved


Add two numbers
Given a and b, return the sum a+b in c.

10 years ago

Solved


Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

10 years ago

Solved


Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

10 years ago

Answered
for loop
The only thing that doesn't look right to me is where you have elseif size(qq)==[1,#] / size(qq)==[1,#+1] Where # is 6...

10 years ago | 0

Answered
Store fllepath in variable
Yes. Just store it as a string. filepath = 'C:\Users\ecorbett\Documents\MATLAB\Labelers\fred'; filename = 'text.csv'; ...

11 years ago | 1

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Answered
Determining Host ID
Does this help? http://www.mathworks.com/support/solutions/en/data/1-171PI/

11 years ago | 0

Answered
How do I access and modify only the non diagonal entries in a matrix?
If tmp is your matrix, try: tmp-diag(diag(tmp)) %works only with square matrices OR triu(tmp,1)+tril(tmp,-1) Both of...

11 years ago | 0

Answered
How did you learn MATLAB?
I started Matlab by being thrown into it through my internship at Sandia Natl. Labs two years ago. I learned how to program in M...

11 years ago | 0

Answered
Changing the names of text files in a directory
Maybe this will do? (Run this under your NAIC directory.) Assuming you are on a windows machine: files = dir('*.txt.*'); na...

11 years ago | 1

Answered
Nested loop problem !
Will this do what you are looking for: *EDIT:* a(:,3:end) = b(:,1:end-2); OR, if you really wanted a for loop: d = ...

11 years ago | 1

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Answered
Finding diag of two cells
Does this work for you? diag(cell2mat([a b])) Note that the solution is the same as: diag([a{1} a{2}]) To get the di...

11 years ago | 0

Answered
changes of data
You would not be able to use a matrix, as matrices can only contain the same data types (all numerical or all character arrays) ...

11 years ago | 0

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Answered
Marking where one clicked with ginput
I did something similar to this when measuring diameters of soot particles. I would frequently get lost as to where I last click...

11 years ago | 1

| accepted

Answered
Control Break Processing
Here's a dirty method, but no handwritten loops as requested. Assume tmp contains your 22x3 cell array of data (the 4th column ...

11 years ago | 0

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