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**Content Feed**

Solved

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

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

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

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

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

| accepted

Determining Host ID

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

11 years ago | 0

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

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

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

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

| accepted

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

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

| accepted

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

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