Community Profile 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).

4 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...

4 years ago

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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...

4 years ago

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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

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

5 years ago

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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...

5 years ago

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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:...

5 years ago

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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...

9 years ago

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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...

9 years ago

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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...

9 years ago

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

9 years ago

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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...

9 years ago

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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...

9 years ago

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

9 years ago

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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 ...

9 years ago

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

9 years ago

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

9 years ago

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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

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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'; ...

10 years ago | 1

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

10 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...

10 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...

10 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...

10 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 = ...

10 years ago | 1

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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...

10 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) ...

10 years ago | 0

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