Linear Indexing. In addition to row and column indexing, MATLAB also supports linear indexing. Linear indexing treats the matrix as a one-dimensional array, andelements are accessed using a single index. The linear index is calculated using the following formula: linear_index = (row_index 1) ...
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From the diagram, which shows the linear indices in the upper left corner of each matrix element, you can see thatA(14)is the same asA(2,4). The single subscript can be a vector containing more than one linear index, as in: A([6 12 15]) ans = 11 15 12 Consider again the prob...
一、基本概念 X=[2,1,0;1,3,5]% 定义2*3 矩阵 matrix (复数 matrices)X=210135size(X)% 测量矩阵的行列数目(行 row,列 column)ans=23X(1,2)% 矩阵的项X_ij,其中i为行指数 row index,j为列指数 column indexans=1X(2,2)ans=3A=zeros(2)% 建立2*2的方块矩阵 square matrixA=0000B=zeros(...
数字1以“\”形对角斜线排列,其他值全部为0的矩阵为单位矩阵(Identity Matrix),记作I(或In×n)。矩阵同单位矩阵相乘时,满足交换率,所得结果为矩阵本身,即A*I = I*A = A。因此,单位矩阵也被称为恒等矩阵。逆矩阵当矩阵A*B=B*A=I时,我们称B是A的逆矩阵(Inverse Matrix),记作B=A^-1,而A则被称为...
(i).angle=angle;end% Rotation matrix from local to global coordinate systemc=cos(angle);s=sin(angle);rot=[c-s0000;sc0000;001000;000c-s0;000sc0;000001];% Relative rotations(变形转角)r1=D_U(Elem(i).n1.dof(3))-rbr;r2=D_U(Elem(i).n2.dof(3))-rbr;% Vector of local ...
When used as an index, the colon operator (:) specifies all the elements in that dimension. The syntax >> x = A(2,:) creates a row vector containing all of the elements from the second row of A. Try creating a variable named density that contains the second column of the matrix nam...
When dealing with vectors or matrices, it may sometimes happen that one has to work only on certain entries of the object, e.g., those with odd index. Consider the following three different possibilities of setting the odd entries of a vector v to 0. % [...] create v n = length(v...
cData(2,2:(startIndex-1)),zData,'k'); end zData = iZ.*ones(1,cData(2,startIndex)); plot3(hAxes,cData(1,(startIndex+1):end),... cData(2,(startIndex+1):end),zData,'k'); pause(.1), drawnow end set(p,'faceColor','r','EdgeColor','w'); ...