Re: [問題] 關於 matlab 的這個指令

[siriusmax (成大機械研究僧-拔辣松)]

※ 引述《jackycc (機奇)》之銘言：
: PQ=paddedsize(size(f));
: 關於這個指令 我在網頁上  和書上都有看到
: 可是打再 matlab上卻說沒這指令
: 請問這指令到底可不可以用呢?

  這個要自己加上去...

  把下面這串存成paddedsize.m 吧

  變成副程式來用

%-----%

function PQ = paddedsize(AB, CD, PARAM)
%PADDEDSIZE Computes padded sizes useful for FFT-based filtering.
%   PQ = PADDEDSIZE(AB), where AB is a two-element size vector,
%   computes the two-element size vector PQ = 2*AB.
%
%   PQ = PADDEDSIZE(AB, 'PWR2') computes the vector PQ such that
%   PQ(1) = PQ(2) = 2^nextpow2(2*m), where m is MAX(AB).
%
%   PQ = PADDEDSIZE(AB, CD), where AB and CD are two-element size
%   vectors, computes the two-element size vector PQ.  The elements
%   of PQ are the smallest even integers greater than or equal to
%   AB + CD -1.
%
%   PQ = PADDEDSIZE(AB, CD, 'PWR2') computes the vector PQ such that
%   PQ(1) = PQ(2) = 2^nextpow2(2*m), where m is MAX([AB CD]).

if nargin == 1
   PQ = 2*AB;
elseif nargin == 2 & ~ischar(CD)
   PQ = AB + CD - 1;
   PQ = 2 * ceil(PQ / 2);
elseif nargin == 2
   m = max(AB); % Maximum dimension.

   % Find power-of-2 at least twice m.
   P = 2^nextpow2(2*m);
   PQ = [P, P];
elseif nargin == 3
   m = max([AB CD]); %Maximum dimension.
   P = 2^nextpow2(2*m);
   PQ = [P, P];
else
   error('Wrong number of inputs.')
end

%---%

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