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Question
Customizing tab completion
I have a function that accepts paired name/value arguments, e.g. solve(A,b,'accuracy',1e-13,'method','LU','threshold',1e-...
ungefär 12 år ago | 1 answer | 0
1
answerProblem
Column norms of a matrix
Given a matrix M, return a vector y such that for each k y(k)=norm(M(:,k)) (y(k) is the Euclidean norm of the k-th col...
ungefär 12 år ago | 9 | 432 solvers
Solved
Sort a list of complex numbers based on far they are from the origin.
Given a list of complex numbers z, return a list zSorted such that the numbers that are farthest from the origin (0+0i) appear f...
ungefär 12 år ago
Solved
The Hitchhiker's Guide to MATLAB
Output logical "true" if the input is the answer to life, the universe and everything. Otherwise, output logical "false".
ungefär 12 år ago
Solved
Column norms of a matrix
Given a matrix M, return a vector y such that for each k y(k)=norm(M(:,k)) (y(k) is the Euclidean norm of the k-th col...
ungefär 12 år ago
return value optimization when overwriting
It seems that you can indeed, see http://blogs.mathworks.com/loren/2007/03/22/in-place-operations-on-data/? I cannot understa...
ungefär 12 år ago | 0
Question
overloading x=[a b; c d]
Suppose a,b,c,d are instances of a custom Matlab class. I can redefine [a b] and [a;b] by overloading horzcat() and vertcat(); h...
ungefär 12 år ago | 1 answer | 2
1
answerSolved
Remove any row in which a NaN appears
Given the matrix A, return B in which all the rows that have one or more <http://www.mathworks.com/help/techdoc/ref/nan.html NaN...
ungefär 12 år 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...
ungefär 12 år 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...
ungefär 12 år 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...
ungefär 12 år 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 ...
ungefär 12 år 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.
ungefär 12 år ago
Solved
Sorted highest to lowest?
Return 1 if the input is sorted from highest to lowest, 0 if not. Example: 1:7 -> 0 [7 5 2] -> 1
ungefär 12 år ago
Solved
Determine if input is odd
Given the input n, return true if n is odd or false if n is even.
ungefär 12 år 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:...
ungefär 12 år ago
Question
return value optimization when overwriting
Consider the following scenario. function A=frobnicate(A) A(1)=1; end X=zeros(2000,2000); X=frobnicate(X); ...
ungefär 12 år ago | 2 answers | 0
2
answersQuestion
Detecting "a and b are the same variable" in O(1) via pointers
I know Matlab uses copy-on-write; that is, if I assign |a=b| and then never modify |a| and |b|, they point to the same chunk of ...
ungefär 12 år ago | 2 answers | 0
2
answersQuestion
GLOBAL could be very inefficient
I am using a GLOBAL statement inside an if command, so that I import the global variable into the local namespace only if it is ...
mer än 12 år ago | 1 answer | 0
1
answerQuestion
GLOBAL could be very inefficient
I am using the GLOBAL instruction inside an if statement, to create a global variable only if it is needed. However, the code an...
mer än 12 år ago | 0 answers | 0