Matlab把符号放进矩阵里要怎么做?xi是个符号,经过运算赋给N1,N2,N3,N4,但是为什么N1,N2,N3,N4不进Nesyms uvwthetan=1;Be=zeros(24,6*(3*n+1));for i=1:6Ne=zeros(1,24,i);endp=zeros(6*(3*n+1),1);xi=1;xi1=-1;xi2=-1/3;xi3=1/3;xi4=1;N1=
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![Matlab把符号放进矩阵里要怎么做?xi是个符号,经过运算赋给N1,N2,N3,N4,但是为什么N1,N2,N3,N4不进Nesyms uvwthetan=1;Be=zeros(24,6*(3*n+1));for i=1:6Ne=zeros(1,24,i);endp=zeros(6*(3*n+1),1);xi=1;xi1=-1;xi2=-1/3;xi3=1/3;xi4=1;N1=](/uploads/image/z/5166607-31-7.jpg?t=Matlab%E6%8A%8A%E7%AC%A6%E5%8F%B7%E6%94%BE%E8%BF%9B%E7%9F%A9%E9%98%B5%E9%87%8C%E8%A6%81%E6%80%8E%E4%B9%88%E5%81%9A%3Fxi%E6%98%AF%E4%B8%AA%E7%AC%A6%E5%8F%B7%2C%E7%BB%8F%E8%BF%87%E8%BF%90%E7%AE%97%E8%B5%8B%E7%BB%99N1%2CN2%2CN3%2CN4%2C%E4%BD%86%E6%98%AF%E4%B8%BA%E4%BB%80%E4%B9%88N1%2CN2%2CN3%2CN4%E4%B8%8D%E8%BF%9BNesyms+uvwthetan%3D1%3BBe%3Dzeros%2824%2C6%2A%283%2An%2B1%29%29%3Bfor+i%3D1%3A6Ne%3Dzeros%281%2C24%2Ci%29%3Bendp%3Dzeros%286%2A%283%2An%2B1%29%2C1%29%3Bxi%3D1%3Bxi1%3D-1%3Bxi2%3D-1%2F3%3Bxi3%3D1%2F3%3Bxi4%3D1%3BN1%3D)
Matlab把符号放进矩阵里要怎么做?xi是个符号,经过运算赋给N1,N2,N3,N4,但是为什么N1,N2,N3,N4不进Nesyms uvwthetan=1;Be=zeros(24,6*(3*n+1));for i=1:6Ne=zeros(1,24,i);endp=zeros(6*(3*n+1),1);xi=1;xi1=-1;xi2=-1/3;xi3=1/3;xi4=1;N1=
Matlab把符号放进矩阵里要怎么做?xi是个符号,经过运算赋给N1,N2,N3,N4,但是为什么N1,N2,N3,N4不进Ne
syms uvwtheta
n=1;
Be=zeros(24,6*(3*n+1));
for i=1:6
Ne=zeros(1,24,i);
end
p=zeros(6*(3*n+1),1);
xi=1;
xi1=-1;
xi2=-1/3;
xi3=1/3;
xi4=1;
N1=((xi-xi2)*(xi-xi3)*(xi-xi4))/((xi1-xi2)*(xi1-xi3)*(xi1-xi4));
N2=((xi-xi2)*(xi-xi3)*(xi-xi4))/((xi2-xi1)*(xi2-xi3)*(xi2-xi4));
N3=((xi-xi1)*(xi-xi2)*(xi-xi4))/((xi3-xi1)*(xi3-xi2)*(xi3-xi4));
N4=((xi-xi1)*(xi-xi2)*(xi-xi3))/((xi4-xi1)*(xi4-xi2)*(xi4-xi3));
for i=1:24
Be(i,i)=1;
end
for i=1:6
Ne(1,i,i)=N1;
Ne(1,i+6,i)=N2;
Ne(1,i+12,i)=N3;
Ne(1,i+18,i)=N4;
end
Matlab把符号放进矩阵里要怎么做?xi是个符号,经过运算赋给N1,N2,N3,N4,但是为什么N1,N2,N3,N4不进Nesyms uvwthetan=1;Be=zeros(24,6*(3*n+1));for i=1:6Ne=zeros(1,24,i);endp=zeros(6*(3*n+1),1);xi=1;xi1=-1;xi2=-1/3;xi3=1/3;xi4=1;N1=
syms uvwtheta-----这干嘛用呢?
xi怎么会是符号呢?明明你赋过值了:xi=1;
所以结果都是数值,没有符号