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Thomas Lai


University of British Columbia

Actif depuis 2012

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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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A résolu


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

presque 12 ans il y a

A résolu


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

presque 12 ans il y a

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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...

environ 12 ans il y a

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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...

environ 12 ans il y a

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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...

environ 12 ans il y a

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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...

environ 12 ans il y a

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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...

environ 12 ans il y a

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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 ...

environ 12 ans il y a

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

environ 12 ans il y a

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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...

environ 12 ans il y a

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

environ 12 ans il y a

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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.

environ 12 ans il y a

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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 ...

environ 12 ans il y a

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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:...

environ 12 ans il y a

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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 ...

environ 12 ans il y a

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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...

environ 12 ans il y a

A résolu


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...

environ 12 ans il y a

Réponse apportée
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 12 ans il y a | 0

Réponse apportée
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 12 ans il y a | 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...

plus de 12 ans il y a | 1 réponse | 0

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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. ...

plus de 12 ans il y a | 1 réponse | 0

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Réponse apportée
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...

plus de 12 ans il y a | 0