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Thomas Lai


University of British Columbia

22 total contributions since 2012

Developer at UBC's Seismic Laboratory for Imaging and Modelling, working on SPOT, pSPOT and SeisDataContainer
Professional Interests: SPOT, pSPOT, SeisDataContainer

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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...

environ 7 ans 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...

environ 7 ans 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...

plus de 7 ans 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...

plus de 7 ans 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...

plus de 7 ans 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...

plus de 7 ans 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...

plus de 7 ans 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 ...

plus de 7 ans ago

Solved


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

plus de 7 ans 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...

plus de 7 ans ago

Solved


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

plus de 7 ans ago

Solved


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

plus de 7 ans 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 ...

plus de 7 ans 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:...

plus de 7 ans 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 ...

plus de 7 ans 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...

plus de 7 ans 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...

plus de 7 ans ago

Answered
I have a C++ class. How can I interface to it through a MATLAB class?
As far as I know, mex does not support object persistence past its basic predefined numeric classes. I tried returning the point...

plus de 7 ans ago | 0

Answered
Persistent Object in mex-File (Segmentation violation)
I have tried a very similar method in trying to get C++ object persistence, and even though I did declare global variables in th...

plus de 7 ans ago | 0

Question


Overloading Numel
I have a need to overload numel for a data container class that i'm building. However it seems to break the overloaded subsref m...

presque 8 ans ago | 0 answers | 0

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answers

Question


spmd, composites and hidden overheads
I have a few questions regarding the inner workings of the spmd block that I wish PCT engineers would give some pointers on. ...

presque 8 ans ago | 1 answer | 0

1

answer

Answered
Memory spike when using previously declared variable in spmd block
Hi Konrad, is there any way to get around the serialization limit of 2GB? Because, 2GB is much too small for any significant lar...

presque 8 ans ago | 0