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Matthias


Actif depuis 2013

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Question


What does this error message mean?
I've got two vectors: times = 0 0.0005 0.0050 0.0500 0.5000 5.0000 mittel = ...

environ 10 ans il y a | 3 réponses | 2

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Réponse apportée
Calculate max(diff(A)) fast and memory efficient.
Just as a comparison: I implemented the for loop way in Julia: elapsed time: 0.016319368 seconds

plus de 10 ans il y a | 0

Question


Calculate max(diff(A)) fast and memory efficient.
Say I have a giant array A of 2 gb and I want to make something like an analog edge-detection: [max, index] = max(diff(A))...

plus de 10 ans il y a | 3 réponses | 0

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Question


How do i calculate the frequency of signal with low sampling rate
I've got a sinusoidal signal with a low sampling rate: x = 0:0.2*pi:6*pi; y = sin(x) -0.25 + 0.5* rand(size(x)); Is...

plus de 10 ans il y a | 1 réponse | 0

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Question


How can I calculate max and min in degree?
I've got an Array with my Phase Phi in degrees:[ 170°,179°,180°,-179°...] ranging from -180° to 180° and I want to calculate how...

plus de 10 ans il y a | 2 réponses | 0

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Question


Improper Arguments. Waitbar Error
I have problems using my waitbar. This is the code I want to run: h = waitbar(0,'uiae'); for file_num = 1:numel(files)...

plus de 11 ans il y a | 1 réponse | 0

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Question


Vectorizing the creation of an offset vector
Is there any possibility to vectorize this piece of code: BIN_1 = 7; C = randi(10,1000,1); offset_vec = zeros(size(C...

plus de 11 ans il y a | 2 réponses | 0

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Réponse apportée
How to reduce the time to calculate the inverse of a matrix
I think the inv function implemented by Mathworks is as fast as it gets for the general purpose. There are two inv-functions in ...

plus de 11 ans il y a | 0

Question


Optimize this program on a GPU
I'm trying to speed up my program on a GPU. But it is much slower than the CPU version, although I use a very powerful GPU. I ha...

plus de 11 ans il y a | 1 réponse | 0

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A résolu


Nearest Numbers
Given a row vector of numbers, find the indices of the two nearest numbers. Examples: [index1 index2] = nearestNumbers([2 5 3...

plus de 11 ans il y a

A résolu


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...

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How to find the position of an element in a vector without using the find function
Write a function posX=findPosition(x,y) where x is a vector and y is the number that you are searching for. Examples: fin...

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A résolu


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...

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Too mean-spirited
Find the mean of each consecutive pair of numbers in the input row vector. For example, x=[1 2 3] ----> y = [1.5 2.5] x=[1...

plus de 11 ans il y a

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Distance walked 1D
Suppose you go from position 7 to 10 to 6 to 4. Then you have walked 9 units of distance, since 7 to 10 is 3 units, 10 to 6 is 4...

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Reverse the vector
Reverse the vector elements. Example: Input x = [1,2,3,4,5,6,7,8,9] Output y = [9,8,7,6,5,4,3,2,1]

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Which values occur exactly three times?
Return a list of all values (sorted smallest to largest) that appear exactly three times in the input vector x. So if x = [1 2...

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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".

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Back and Forth Rows
Given a number n, create an n-by-n matrix in which the integers from 1 to n^2 wind back and forth along the rows as shown in the...

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Find the numeric mean of the prime numbers in a matrix.
There will always be at least one prime in the matrix. Example: Input in = [ 8 3 5 9 ] Output out is 4...

plus de 11 ans il y a

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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.

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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...

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Check if sorted
Check if sorted. Example: Input x = [1 2 0] Output y is 0

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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...

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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 ...

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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...

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Réponse apportée
how do i sort a single row in terms of descending terms
If you only want to sort the first column have a look at B = sort(A,dim) http://www.mathworks.de/de/help/matlab/ref/sor...

plus de 11 ans il y a | 0

Réponse apportée
How can you separate incoming serial data?
I don't have an Arduino, so I couldn't test it. But how about that: c_str=regexp(C,'?','split');

plus de 11 ans il y a | 0

| A accepté

A résolu


Which doors are open?
There are n doors in an alley. Initially they are all shut. You have been tasked to go down the alley n times, and open/shut the...

plus de 11 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...

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