matlab 稀疏矩阵(sparse matrix) 参数的设置:spparms() spparms('spumoni', 3);:Set sparse monitor flag to obtaindiagnostic output 1. 创建稀疏矩阵 A = sparse(M, N); % 默认得到的是全 0 稀疏矩阵; 2. spdiags 提取稀疏矩阵的“对角线” [B,d]= spdiags(A) % d 表示的是非零对角线所对应的编...
pinv:伪逆 plot:平面线图 plot3:三维线图 plotmatrix:矩阵的散点图 plotyy:双纵坐标图 poissinv:泊松分布逆累计概率分布函数 poissrnd:泊松分布随机数发生器 pol2cart:极或柱坐标变为直角坐标 polar:极坐标图 poly:矩阵的特征多项式、根集对应的多项式 poly2str:以习惯方式显示多项式 poly2sym:双精度多项式系数转变为...
[a1;a2;a3];%Concatenate rows into final matrix%Create mp-matrices by conversion from double>>A=mp(rand(5));>>B=mp(eye(5));>>[V,D]=eig(A,B);>>norm(A*V-B*V*D,1)/(norm(A,1)*norm(B,1))ans=8.1433805952291741154581605524001229e-34%Create sparse matrixwithaccumulation using ...
1、尽量避免使用循环,MATLAB的文档中写到“MATLAB is a matrix language, which means it is designed for vector and matrix operations. You can often speed up your M-file code by using vectorizing algorithms that take advantage of this design. Vectorization means converting for and while loops to eq...
完全矩阵（FullMatrix）每一个元素都存成double的数据型态，占用8个Byte一个m×n的完全矩阵，所占用的内存空间是8×m×n个Byte 稀疏矩阵（SparseMatrix）大部分的元素都是0只须储存「非零元素的位置」及其「元素值」两大优点:1.节省内存储存空间 2.节省许多不必要的运算 稀疏矩阵范例-1(I)sparse指令可将一个...
Sparse uniformly distributed random matrix collapse all in pageSyntax R = sprand(S) R = sprand(m,n,density) R = sprand(m,n,density,rc)Description R = sprand(S) creates a sparse matrix that has the same sparsity pattern as the matrix S, but with uniformly distributed random entries. ...
可以通过下标(行列索引)引用矩阵的元素,如 Matrix(m,n)。 也可以采用矩阵元素的序号来引用矩阵元素。 矩阵元素的序号就是相应元素在内存中的排列顺序。 在MATLAB中,矩阵元素按列存储。 序号(Index)与下标(Subscript )是一一对应的,以m*n矩阵A为例,矩阵元素A(i,j)的序号为(j-1)*m+i。
Many MATLAB functions support sparse gpuArray objects. For more information, see Work with Sparse Arrays on a GPU. Check gpuArray-Supported Functions Several MATLAB toolboxes include functions with gpuArray support. To view lists of all functions in these toolboxes that support gpuArray objects, ...
% Construct the block diagonal matrix % まずブロック対角行列成分を作成 %%分块对角矩阵的生成 dd = eye(Nx); %Nx阶单位阵 ca=Ax/dx^2 - 2*dd/dy^2; %y向差分使主对角元还要再减,减的同时考虑网格长dx,dy,构造“主块”,用ca表示 sca=sparse(ca); %将此Nx阶三对角阵以稀疏阵形式存储为sca...
path);figure;imshow(~mapData.*255);colormapgray;axisimage;holdon;plot(x,y,'-r','Linewidth',3)scatter(StartPoint(1),StartPoint(2),'go','filled');scatter(EndPoint(1),EndPoint(2),'bo','filled');title('Solution to Maze')toc%%functiongraph=mat2graph(mat, varargin)%PURPOSE:% To represen...