[1] https://stackoverflow.com/questions/16143314/matlab-arrayfun-cellfun-spfun-and-structfun-vs-simple-for-loop [2] https://stackoverflow.com/questions/12522888/arrayfun-can-be-significantly-slower-than-an-explicit-loop-in-matlab-why [3] https://stackoverflow.com/questions/15851718/what-is-the-...
functionforloopvsarrayfun x = rand(1,1e6); tic y = zeros(size(x)); fori=1:length(x) y(i) = x(i).^2; end t1=toc; tic y = arrayfun(@(x) x.^2, x); t2=toc; fprintf('for loop time = %g\n', t1); fprintf('arrayfun time = %g\n', t2); ...
在显式的for循环版本中，每个操作都在GPU上单独执行，这会产生开销--arrayfun版本是一个单一的GPU内核调...
1.“计算向量、矩阵化,尽量减少for循环。”[/B] 因为MATLAB本来就是矩阵实验室的意思,他提供了极其强大而灵活的矩阵运算能力,你就没必要自己再用自己编写的for循环去实现矩阵运算的功能了。另外由于matlab是一种解释性语言,所以最忌讳直接使用循环语句。但在有些情况下,使用for循环可以提高程序的易读性,在效率提高不...
U = rand(30000,4);% just for test [N,d] = size(U);% U is a partition matrix comb = ones(d,2).*(1:d)'; V = max(cell2mat(arrayfun(@(k) cell2mat(arrayfun(@(j) pdist2(U((j+1):N,comb(k,1)),U(j,comb(k,2)),@min),(1:(N-1)).','UniformOutput',false)),1:size...
Matlab是为矢量和矩阵操作而设计的,因此,可以通过矢量化方法加速M文件的运行。矢量化是指将for循环和while循环转换为等价的矢量或矩阵操作。下面给出一个循环的例子: i=0; for n = 0:0.1:1000 i=i+1; y(i)=cos(n); end 那么我们可以矢量化为: ...
Fastest way for page-wise computation - FOR vs ARRAYFUN vs PAGEFUN I'd like to know the fastest way to deal with a 3D array in a page-wise way. Suppose I have the following data: rng(0); data... bijna 3 jaar ago | 0 answers | 0 ...
% Establish criteria for rejecting boundaries based on their length maxPossibleXLength = diff(vehicleROI(1:2)); minXLength = maxPossibleXLength * 0.60; % establish a threshold % Reject short boundaries isOfMinLength = arrayfun(@(b)diff(b.XExtent) > minXLength, boundaries); ...
colHeadings = arrayfun(@(x)sprintf('%d',x),0:9,'UniformOutput',false); format = repmat('%-9s',1,11); header = sprintf(format,'digit |',colHeadings{:}); fprintf('\n%s\n%s\n',header,repmat('-',size(header)));foridx = 1:numel(digits) ...
Is there a Matlab equivalent to the Mathematica FoldList function (a generalization of cumsum, cummax, etc., with an arbitrary function). One could clearly write one, but presumably a built in (such as arrayfun) would be much more efficient. True?