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[求助] 關(guān)于MATlAB

程序如下：
clear all;
clc;
%data = xlsread('E:\nengneng\book1');
%xlsread('E:\nengneng\book1.xls');
Data=load('C:\Users\xing\Desktop\judy\x2.mat')
%  Data(:,1)
%  Data(1:10,1)
% data(:,1)
X=Data.x2(:,1);
X_number =size(X)
Y=Data.x2(:,2);
% Z=Data.x2(:,3);

for j=1:41
for i=1:271
      Z_Z(i,j)=Z((j-1)*271+i);
      Z_X(i,j)=X((j-1)*271+i);
      Z_Y(i,j)=Y((j-1)*271+i);
end
end
% Z_Z
% Z_X
% Z_Y
%劃定區(qū)域
%Area1~5
Area1=1;
Area2=1;
Area3=1;
Area4=1;
Area5=1;
for j=1:41
for i=1:271
      if Z_X(i,j)<330&&Z_Y(i,j)<250&&Z_X(i,j)>280&&Z_Y(i,j)>200
         Area1_point(Area1,

=[i,j];
         Area1=Area1+1;
      end
      if Z_X(i,j)>330&&Z_X(i,j)<380&&Z_Y(i,j)<250&&Z_Y(i,j)>200
         Area2_point(Area2,

=[i,j];
         Area2=Area2+1;
      end

      if Z_X(i,j)>380&&Z_X(i,j)<550&&Z_Y(i,j)<250&&Z_Y(i,j)>200&&0.56666*Z_X(i,j)-26.666<Z_Y(i,j)
         Area3_point(Area3,

=[i,j];
         Area3=Area3+1;
      end

      if Z_X(i,j)>280&&Z_X(i,j)<380&&Z_Y(i,j)>250&&Z_X(i,j)-15>Z_Y(i,j)
         Area4_point(Area4,

=[i,j];
         Area4=Area4+1;
      end

      if Z_X(i,j)>380&&Z_X(i,j)<550&&Z_Y(i,j)>250&&Z_Y(i,j)<400&&0.56666*Z_X(i,j)-26.666<Z_Y(i,j)&&Z_X(i,j)-15>Z_Y(i,j)
         Area5_point(Area5,

=[i,j];
Area5=Area5+1;
end
end
end
% Area1_point
% Area2_point
% Area3_point
% Area4_point
% Area5_point
%計(jì)算面積
px1=size(Area1_point);
px2=size(Area2_point);
px3=size(Area3_point);
px4=size(Area4_point);
px5=size(Area5_point);
px1+px2+px3+px4+px5
AREA1=0;
AREA2=0;
AREA3=0;
AREA4=0;
AREA5=0;
Circle1=0;
Circle2=0;
Circle3=0;
Circle4=0;
Circle5=0;
for i=1:px1
I=Area1_point(i,1);
J=Area1_point(i,2);
Circle1=Circle1+0.25*(Z_X(I+1,J)-Z_X(I-1,J))*(Z_Y(I,J+1)-Z_Y(I,J-1));
AREA1=AREA1+0.25*(Z_X(I+1,J)-Z_X(I-1,J))*(Z_Y(I,J+1)-Z_Y(I,J-1))*Z_Z(I,J);
end
for i=1:px2
I=Area2_point(i,1);
J=Area2_point(i,2);
Circle2=Circle2+0.25*(Z_X(I+1,J)-Z_X(I-1,J))*(Z_Y(I,J+1)-Z_Y(I,J-1));
AREA2=AREA2+0.25*(Z_X(I+1,J)-Z_X(I-1,J))*(Z_Y(I,J+1)-Z_Y(I,J-1))*Z_Z(I,J);
end
for i=1:px3
I=Area3_point(i,1);
J=Area3_point(i,2);
Circle3=Circle3+0.25*(Z_X(I+1,J)-Z_X(I-1,J))*(Z_Y(I,J+1)-Z_Y(I,J-1));
AREA3=AREA3+0.25*(Z_X(I+1,J)-Z_X(I-1,J))*(Z_Y(I,J+1)-Z_Y(I,J-1))*Z_Z(I,J);
end
for i=1:px4
I=Area4_point(i,1);
J=Area4_point(i,2);
Circle4=Circle4+0.25*(Z_X(I+1,J)-Z_X(I-1,J))*(Z_Y(I,J+1)-Z_Y(I,J-1));
AREA4=AREA4+0.25*(Z_X(I+1,J)-Z_X(I-1,J))*(Z_Y(I,J+1)-Z_Y(I,J-1))*Z_Z(I,J);
end
for i=1:px5
I=Area5_point(i,1);
J=Area5_point(i,2);
Circle5=Circle5+0.25*(Z_X(I+1,J)-Z_X(I-1,J))*(Z_Y(I,J+1)-Z_Y(I,J-1));
AREA5=AREA5+0.25*(Z_X(I+1,J)-Z_X(I-1,J))*(Z_Y(I,J+1)-Z_Y(I,J-1))*Z_Z(I,J);
end
%Circle1
Circle2
Circle3
Circle4
Circle5
px1
px2
px3
px4
px5
AREA1
AREA2
AREA3
AREA4
AREA5
% [AREA1 AREA2 AREA3 AREA4 AREA5]

% N=100;
% x0=linspace(min(x),max(x),N);
% y0=linspace(min(y),max(y),N);
% [X,Y,Z]=griddata(x,y,z,x0',y0,'v4');%插值擬合曲面。當(dāng)然，由于你沒有說明xy平面上的條件，所以這里擬合的曲面Z=f(X,Y)定義在x0,和y0的矩形區(qū)間內(nèi)；
% figure;mesh(X,Y,Z);
% Z
% %體積的近似值用下代碼
% L=sum(sum(abs(Z)));
% S=abs((y0(2)-y0(1))*(x0(2)-x0(1)));
% V=L*S; %體積
最后運(yùn)行顯示
Data =

data: [12195x3 double]

??? Reference to non-existent field 'x2'.
求指教

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[求助] 關(guān)于MATlAB

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