sacasub

PURPOSE ^

SACASUB extracts a submatrix of size m*n around the point [i j] of

SYNOPSIS ^

function B=sacasum(A,pto,lad,inte)

DESCRIPTION ^

 SACASUB extracts a submatrix of size m*n around the point [i j] of
 the matrix A.

 It is extracted as:

     If m,n are pairs:

          B = A(i-floor(m/2)+1:i+floor(m/2),j-floor(n/2)+1:j+floor(n/2))

     If m,n are odd:

          B = A(i-ceil(m/2)+1:i+ceil(m/2)-1,j-ceil(n/2)+1:j+ceil(n/2)-1)


 USO: B=sacasub(A,[i j],[m n],interpola?);

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 
0002 % SACASUB extracts a submatrix of size m*n around the point [i j] of
0003 % the matrix A.
0004 %
0005 % It is extracted as:
0006 %
0007 %     If m,n are pairs:
0008 %
0009 %          B = A(i-floor(m/2)+1:i+floor(m/2),j-floor(n/2)+1:j+floor(n/2))
0010 %
0011 %     If m,n are odd:
0012 %
0013 %          B = A(i-ceil(m/2)+1:i+ceil(m/2)-1,j-ceil(n/2)+1:j+ceil(n/2)-1)
0014 %
0015 %
0016 % USO: B=sacasub(A,[i j],[m n],interpola?);
0017 
0018 function B=sacasum(A,pto,lad,inte)
0019 
0020 a=size(A);
0021 i=pto(1);
0022 j=pto(2);
0023 m=lad(1);
0024 n=lad(2);
0025 ptoent=floor(pto);
0026 dd=pto-ptoent;
0027 
0028 if (sum(abs(dd))==0)|(inte==0)
0029   i=floor(i);
0030   j=floor(j);
0031   if floor(m/2)<m/2
0032      mf=i-ceil(m/2)+1;
0033      Mf=i+ceil(m/2)-1;
0034   else
0035      mf=i-floor(m/2)+1;
0036      Mf=i+floor(m/2);
0037   end
0038   if floor(n/2)<n/2
0039      mc=j-ceil(n/2)+1;
0040      Mc=j+ceil(n/2)-1;
0041   else
0042      mc=j-floor(n/2)+1;
0043      Mc=j+floor(n/2);
0044   end
0045   AAA=zeros(m,n);
0046   if (mf<1)|(Mf>a(1))|(mc<1)|(Mc>a(2))
0047      if (mf>a(1))|(Mf<1)|(mc>a(2))|(Mc<1)
0048             B=zeros(m,n);
0049      elseif ((mf<1)&(mc<1))&((Mf>1)&(Mc>1))
0050             fi=1-mf+1;
0051             ci=1-mc+1;
0052             AAA(fi:m,ci:n)=A(1:m-fi+1,1:n-ci+1);
0053      elseif ((mf<1)&(Mc>a(2)))&((Mf>1)&(mc<a(2)))
0054             fi=1-mf+1;
0055             cf=n-(Mc-a(2));
0056             AAA(fi:m,1:cf)=A(1:m-fi+1,a(2)-cf+1:a(2));
0057      elseif ((Mf>a(1))&(mc<1))&((mf<a(1))&(Mc>1))
0058             ci=1-mc+1;
0059             ff=m-(Mf-a(1));
0060             AAA(1:ff,ci:n)=A(a(1)-ff+1:a(1),1:n-ci+1);
0061      elseif ((Mf>a(1))&(Mc>a(2)))&((mf<a(1))&(mc<a(2)))
0062             cf=n-(Mc-a(2));
0063             ff=m-(Mf-a(1));
0064             AAA(1:ff,1:cf)=A(a(1)-ff+1:a(1),a(2)-cf+1:a(2));
0065      elseif (mf<1)&((Mf>1)&(mc>1)&(Mc<a(2)))
0066             fi=1-mf+1;
0067             AAA(fi:m,1:n)=A(1:m-fi+1,mc:Mc);
0068      elseif (mc<1)&((Mc>1)&(mf>1)&(Mf<a(1)))
0069             ci=1-mc+1;
0070             AAA(1:m,ci:n)=A(mf:Mf,1:n-ci+1);
0071      elseif (Mf>a(1))&((mf<a(1))&(mc>1)&(Mc<a(2)))
0072             ff=m-(Mf-a(1));
0073             AAA(1:ff,1:n)=A(a(1)-ff+1:a(1),mc:Mc);
0074      elseif (Mc>a(2))&((mc<a(2))&(mf>1)&(Mf<a(1)))
0075            cf=n-(Mc-a(2));
0076            AAA(1:m,1:cf)=A(mf:Mf,a(2)-cf+1:a(2));
0077      end
0078      B=AAA;
0079   else
0080      B=A(mf:Mf,mc:Mc);
0081   end
0082 else
0083   i=floor(i);
0084   j=floor(j);
0085   m=m+2;
0086   n=n+2;
0087   if floor(m/2)<m/2
0088      mf=i-ceil(m/2)+1;
0089      Mf=i+ceil(m/2)-1;
0090   else
0091      mf=i-floor(m/2)+1;
0092      Mf=i+floor(m/2);
0093   end
0094   if floor(n/2)<n/2
0095      mc=j-ceil(n/2)+1;
0096      Mc=j+ceil(n/2)-1;
0097   else
0098      mc=j-floor(n/2)+1;
0099      Mc=j+floor(n/2);
0100   end
0101   AAA=zeros(m,n);
0102   if (mf<1)|(Mf>a(1))|(mc<1)|(Mc>a(2))
0103      if (mf>a(1))|(Mf<1)|(mc>a(2))|(Mc<1)
0104             B=zeros(m,n);
0105      elseif ((mf<1)&(mc<1))&((Mf>=1)&(Mc>=1))
0106             fi=1-mf+1;
0107             ci=1-mc+1;
0108             AAA(fi:m,ci:n)=A(1:m-fi+1,1:n-ci+1);
0109      elseif ((mf<1)&(Mc>a(2)))&((Mf>=1)&(mc<=a(2)))
0110             fi=1-mf+1;
0111             cf=n-(Mc-a(2));
0112             AAA(fi:m,1:cf)=A(1:m-fi+1,a(2)-cf+1:a(2));
0113      elseif ((Mf>a(1))&(mc<1))&((mf<=a(1))&(Mc>=1))
0114             ci=1-mc+1;
0115             ff=m-(Mf-a(1));
0116             AAA(1:ff,ci:n)=A(a(1)-ff+1:a(1),1:n-ci+1);
0117      elseif ((Mf>a(1))&(Mc>a(2)))&((mf<=a(1))&(mc<=a(2)))
0118             cf=n-(Mc-a(2));
0119             ff=m-(Mf-a(1));
0120             AAA(1:ff,1:cf)=A(a(1)-ff+1:a(1),a(2)-cf+1:a(2));
0121      elseif (mf<1)&((Mf>=1)&(mc>=1)&(Mc<=a(2)))
0122             fi=1-mf+1;
0123             AAA(fi:m,1:n)=A(1:m-fi+1,mc:Mc);
0124      elseif (mc<1)&((Mc>=1)&(mf>=1)&(Mf<=a(1)))
0125             ci=1-mc+1;
0126             AAA(1:m,ci:n)=A(mf:Mf,1:n-ci+1);
0127      elseif (Mf>a(1))&((mf<=a(1))&(mc>=1)&(Mc<=a(2)))
0128             ff=m-(Mf-a(1));
0129             AAA(1:ff,1:n)=A(a(1)-ff+1:a(1),mc:Mc);
0130      elseif (Mc>a(2))&((mc<=a(2))&(mf>=1)&(Mf<=a(1)))
0131             cf=n-(Mc-a(2));
0132             AAA(1:m,1:cf)=A(mf:Mf,a(2)-cf+1:a(2));
0133      end
0134      BB=AAA;
0135   else
0136      BB=A(mf:Mf,mc:Mc);
0137   end
0138   B=zeros(m-2,n-2);
0139   for k=2:m-1
0140       for l=2:n-1
0141           S1=BB(k,l);
0142           S2=BB(k,l+1);
0143           S3=BB(k+1,l);
0144           S4=BB(k+1,l+1);
0145           B(k-1,l-1)=(1-dd(1))*((1-dd(2))*S1+dd(2)*S2)+dd(1)*((1-dd(2))*S3+dd(2)*S4);
0146       end
0147   end
0148 end

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