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# Thomas

### Stockholm University

30 total contributions since 2012

Professional Interests: TEM, Image analysis, EELS, Spectral Imaging, Photography

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Question

Smooth interpolation for warping an image using a deformation map
I have a series of 2D images that I need to register similar to the one below. The registration is neither geometric nor ri...

circa un anno ago | 0 answers | 0

### 0

Solved

We love vectorized solutions. Problem 1 : remove the row average.
Given a 2-d matrix, remove the row average from each row. Your solution MUST be vectorized. The solution will be tested for ac...

circa 3 anni ago

Solved

Matrix indexing with two vectors of indices
Given a matrix M and two index vectors a and b, return a row vector x where x(i) = M(a(i),b(i)).

circa 3 anni ago

Solved

Getting logical indexes
This is a basic MATLAB operation. It is for instructional purposes. --- Logical indexing works like this. thresh = 4...

circa 3 anni ago

Solved

Sum all integers from 1 to 2^n
Given the number x, y must be the summation of all integers from 1 to 2^x. For instance if x=2 then y must be 1+2+3+4=10.

circa 3 anni ago

Solved

Return elements unique to either input
Given two numeric inputs a and b, return a row vector that contains the numbers found in only a or only b, but not both. For ex...

circa 3 anni ago

Solved

Replicate elements in vectors
Replicate each element of a row vector (with NaN) a constant number of times. Examples : n=2, A=[1 2 3] -> [1 1 2 2 3 3] n=0...

circa 3 anni 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...

circa 3 anni ago

Solved

Find the largest value in the 3D matrix
Given a 3D matrix A, find the largest value. Example >> A = 1:9; >> A = reshape(A,[3 1 3]); >> islargest(A) a...

circa 3 anni ago

Solved

Check if number exists in vector
Return 1 if number _a_ exists in vector _b_ otherwise return 0. a = 3; b = [1,2,4]; Returns 0. a = 3; b = [1,...

circa 3 anni 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...

circa 3 anni 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...

circa 3 anni 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. Examp...

circa 3 anni ago

Solved

Find all elements less than 0 or greater than 10 and replace them with NaN
Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

circa 3 anni 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 ...

circa 3 anni 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...

circa 3 anni ago

Solved

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

circa 3 anni 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...

circa 3 anni ago

Solved

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

circa 3 anni ago

Solved

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

circa 3 anni 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 ...

circa 3 anni 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:...

circa 3 anni ago

Use griddedinterpolant to interpolate over missing values
Both of the suggestions by Walter and Guillaume worked very well for me. If I choose to use the exact syntax I suggested above,...

circa 3 anni ago | 0

Question

Use griddedinterpolant to interpolate over missing values
I would like to use griddedInterpolant to interpolate over datapoints that I need to discard from an N-dimensional matrix. Spec...

circa 3 anni ago | 3 answers | 0

### 3

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...

oltre 3 anni ago

How can I insert the *contents* of a string variable directly into my code?
This solution worked very well for me, thanks! I had to make one minor modification. I should enclose the string in double quo...

oltre 3 anni ago | 0

Question

How can I insert the *contents* of a string variable directly into my code?
I am working with git version control and would like to use the following function to commit my changes: function gitCommit...

oltre 3 anni ago | 3 answers | 0

### 3

Question

Improving the consistency of the NNMF function
I'm attempting to use non-negative matrix factorization on a matrix containing spectral information (A). Whenever I run the nnm...

oltre 5 anni ago | 1 answer | 0

### 1

Question

Curve fitting for a line profile
I would like to use an automated process to describe my line profile curve (such as that in the image) as the sum of an *arbitra...

oltre 6 anni ago | 1 answer | 0