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我有一段需要很長時間才能運行的代碼。我閱讀了mathworks網站上的矢量化頁面。我仍然有點困惑,是否可以矢量化我運行plane_intersect的部分?如何在Matlab中正確地進行矢量化
Unvectorized
for N = 1:sizeDimages
imPos = anaInfoSat(N).ImagePositionPatient;
A2Z = imPos(3);
A2Y = imPos(2);
A2X = imPos(1);
[upP1(N,:)]=plane_intersect([cosSx(1),cosSy(1),cosSz(1)],[uppersatX1,uppersatY1,uppersatZ1],crossS,[A2X,A2Y,A2Z]);
[loP1(N,:)]=plane_intersect([cosSx(1),cosSy(1),cosSz(1)],[lowersatX1,lowersatY1,lowersatZ1],crossS,[A2X,A2Y,A2Z]);
end
我試圖在量化的事情是UPP1是NX3矩陣。我預先分配upP1矩陣。以下代碼返回有關尺寸不匹配的錯誤。 ImagePosition是一個1x3矩陣。
N = 1:sizeDimages;
imPos = anaInfoSat(N).ImagePositionPatient;
A2Z = imPos(3);
A2Y = imPos(2);
A2X = imPos(1);
[upP1(N,:)]=plane_intersect([cosSx(1),cosSy(1),cosSz(1)],[uppersatX1,uppersatY1,uppersatZ1],crossS,[A2X,A2Y,A2Z]);
[loP1(N,:)]=plane_intersect([cosSx(1),cosSy(1),cosSz(1)],[lowersatX1,lowersatY1,lowersatZ1],crossS,[A2X,A2Y,A2Z]);
這裏是plane_intersect代碼的一部分,應該足以讓你知道它做什麼。
function [P,N,check]=plane_intersect(N1,A1,N2,A2)
%plane_intersect computes the intersection of two planes(if any)
% Inputs:
% N1: normal vector to Plane 1
% A1: any point that belongs to Plane 1
% N2: normal vector to Plane 2
% A2: any point that belongs to Plane 2
%
%Outputs:
% P is a point that lies on the interection straight line.
% N is the direction vector of the straight line
% check is an integer (0:Plane 1 and Plane 2 are parallel'
% 1:Plane 1 and Plane 2 coincide
% 2:Plane 1 and Plane 2 intersect)
%
% Example:
% Determine the intersection of these two planes:
% 2x - 5y + 3z = 12 and 3x + 4y - 3z = 6
% The first plane is represented by the normal vector N1=[2 -5 3]
% and any arbitrary point that lies on the plane, ex: A1=[0 0 4]
% The second plane is represented by the normal vector N2=[3 4 -3]
% and any arbitrary point that lies on the plane, ex: A2=[0 0 -2]
%[P,N,check]=plane_intersect([2 -5 3],[0 0 4],[3 4 -3],[0 0 -2]);
你可能只是寫'upP1 = pl ane_intersect(...);'。除非你告訴我們'plane_intersect'在做什麼,否則問題的其餘部分是無法回答的。請發佈代碼。 – shoelzer 2013-02-27 18:36:03
我用plane_intersect info/code更新了問題。 – 2013-02-27 18:44:30