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Matthias


2013 年からアクティブ

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質問


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

10年以上 前 | 3 件の回答 | 2

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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

10年以上 前 | 0

質問


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))...

10年以上 前 | 3 件の回答 | 0

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質問


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...

10年以上 前 | 1 件の回答 | 0

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質問


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...

11年弱 前 | 2 件の回答 | 0

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質問


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)...

11年以上 前 | 0 件の回答 | 0

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質問


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...

11年以上 前 | 2 件の回答 | 0

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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 ...

12年弱 前 | 0

質問


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...

12年弱 前 | 1 件の回答 | 0

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

12年弱 前

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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...

12年弱 前

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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...

12年弱 前

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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...

12年弱 前

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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...

12年弱 前

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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...

12年弱 前

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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]

12年弱 前

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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...

12年弱 前

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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".

12年弱 前

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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...

12年弱 前

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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...

12年弱 前

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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.

12年弱 前

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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...

12年弱 前

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

12年弱 前

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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...

12年弱 前

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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 ...

12年弱 前

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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...

12年弱 前

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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...

12年弱 前 | 0

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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');

12年弱 前 | 0

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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...

12年弱 前

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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...

12年弱 前

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