keepfirst.m

来自「老外写的小波变换的工具箱」· M 代码 · 共 17 行

function sparse = KeepFirst(dense,N)
% KeepFirst -- Kill (set to zero) all but N first elements
%  Usage
%    sparse = KeepFirst(dense,N)
%
	sparse    = dense .* (1:length(dense) <= N);
    
    
 
 
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