matlab问题：J(abs(J)

matlab问题：J(abs(J) matlab abs(J(k,:)) matlab中j~ 设xa(t)=exp(-1000*abs(t));,怎么用matlab球Xa(jΩ)呀? 关于matlab这段代码 [i,j] = find(abs(R2_1 - R2_2) matlab多元函数求最小值问题matlab求r =1/(9-j)*(i^2+81-18*j+j^2)^(1/2)*(38/5-19/20*fix(j)+1/20*(8-fix(j))^2)+(fix(j)+1-j)/(9-j)*(i^2+81-18*j+j^2)^(1/2)*(9/5-1/10*fix(j))+(j^2-2*j*n+n^2+m^2-2*m*i+i^2)^(1/2)/(j-n)*(-19/20*fix((n*i-m*j)/(i+n-j- matlab问题：J=filter2(fspecial('sobel'),I);是什么意思? 请问这两个语句有什么区别啊?我正参加我们学校的数学建模,用lingo求解时出现了问题,1.min=@sum(assigin(i,j):d1(i,j)*(20*@abs(x1-a(i))+30*@abs(y1-b(j)))+d2(i,j)*(20*@abs(x2-a(i))+30*@abs(y2-b(j))));.2.min=@sum(assigin(i,j) J j J. j j j “J. j 这是matlab中水平差分图像的一段代码.谁能告诉我s1((i-1)*n+j)=g1(i,j); %水平差异for i=1:mfor j=1:nif j-1==0g1(i,j)=f(i,j);elseg1(i,j)=abs(f(i,j)-f(i,j-1)); ends1((i-1)*n+j)=g1(i,j);endend matlab 中 a(i:j)