% TREEPLOT(p) plots a picture of a tree given a row vector of If you want to use 4 cores easily:matlabpool open 4Ībhishek Sharma modified the below file for prettier printing, see his files: Attach:myTreeplot.txt, Attach:makeTreeFromParsed.txt (change to. Use it to compare two possible ways to do the same thingtic for i=1:10000 inv(rand(3,3)) end toc Never change a lot of rows in a matrix, instead change columns, since matlab is column major.įrequently compare times of different functions Never grow matrices inside a loop, always pre-allocate (even if you don't know how large it will be) with an upper bound on what you need and just delete zero or unused entries at the end % concatenates a cell array of strings into one long string Set(gcf,'paperposition',) % Place plot on figure Set(gcf,'papersize',) % Desired outer dimensionsof figure Set dimensions by hand to fit your figure Plot figure to a printable pdf of correct size Normalize each row or column to length oneĮach line in one char cellt = textread('ain','%s','delimiter', '\n') Or just sort the entire matrix and get indices of sorted matrix elements = sort(costMatrix(:)) Īnd do not produce an Na N ?, if the sum is 0:E = 1./x,sum(E,2)),0,size(E,1),size(E,1))*E If you want to delete all columns that contain only zeros:A=A(:,any(A))įind n smallest values in a matrix and return their indices This sets the matrix to all those rows we want, we can also explicitly delete them:A(~any(A,2),:) = If you want to delete all rows that contain only zeros:A=A(any(A,2),:) Set the value at many (row,column) index pairs in a matrixĪ(sub2ind(size(A),rowIndices,columnIndices))=1 Ĭreate new matrix B where each column in A is repeated k times: OneMat = spalloc(numRows,numCols,40*numRows) % we have around at most numUsedCols = 40, each has numRows entries User some values insides the zeros function that resembles the size of your matricesįor sparse matrices, we need to approximate how much data they are likely to store Preallocate a Cell Array of Full Matrices and Sparse Matrices = ismember(queryRow,matrixToSearchIn,'rows') % check if queryRow is also a row in matrixToSearchIn Multiply a 3d matrix with a vector to get a 2d matrixĬoncatenate a cell array of matrices to one 3d matrix Assign the same matrix to all elements of a struct array
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |