matlab - Construct a 3D matrix with linear index -

-

i want construct 3d matrix of size = 80 * 80 * 2 based on set of data:

 1        4532   1257.0  1        4556   1257.0  1        4622   257.0  1        4633   257.0  2        7723   31.0  2        8024   31.0  2        8099   31.0  2        9800   31.0  2        8524   34.0  2        8525   34.0  2        8700   734.0  2        8701   734.0
  • the first column denotes slice of matrix.
  • the second column denotes linear index of matrix.
  • the third column denotes values of elements.

what i'm doing is: first obtain 2 80 * 80 2d matrices a , b , concatenate them using cat(3, a, b):

denote above data m. 

for = 1 : size(m,1)     if (m(:,1)==1)         [r c]=ind2sub(m(:,2));         = accumarray([r c], m(:,3));     elseif (m(:,1)==2)         [r c]=ind2sub(m(:,2));         b = accumarray([r c], m(:,3));     end end  cat(3, a, b)

i curious if there solutions can build 80*80*2 matrix merely linear index (the second column of data) or other simpler solution works purpose.

i appreciate help.

so, i'm assuming example data incorrect, , values in column 2 less n*n, nxn size of matrix (80x80 in case).

if that's case, following 2 lines should trick.

out = zeros(n,n,2); out((m(:,1)-1).*n^2+m(:,2)) = m(:,3)

if second column contains values 2*n*n, , linear indices, then:

out = zeros(n,n,2); out(m(:,2)) = m(:,3)

Comments

Post a Comment

Popular posts from this blog

python - pip install -U PySide error -

-
does know how avoid following error when running pip install -u pyside per official website instructions here: https://pypi.python.org/pypi/pyside/#installing-pyside-on-a-mac-os-x-system note have done brew install qt successfully. you using pip version 7.0.3, version 7.1.2 available. should consider upgrading via 'pip install --upgrade pip' command. collecting pyside using cached pyside-1.2.4.tar.gz installing collected packages: pyside running setup.py install pyside complete output command /applications/anaconda/bin/python -c "import setuptools, tokenize;__file__='/private/var/folders/dy/ttgqhqqx3g9bsbsnqnxsk2z80000gq/t/pip-build-cpxemt/pyside/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/dy/ttgqhqqx3g9bsbsnqnxsk2z80000gq/t/pip-0r7hri-record/install-record.txt --single-version-externally-managed --compile:
Read more

arrays - C++ error: a brace-enclosed initializer is not allowed here before ‘{’ token -

-
simple question: i'm trying initialize array within c++ class declaration: using namespace std; #include <string> class myclass{ public: string myarray[] = {"a","b","c"}; }; and i'm getting error: error: brace-enclosed initializer not allowed here before ‘{’ token no, without complied c++11 compiler, cannot initialize member array in declaration. have initialize array member in constructor. , don't use open array if know number of elements initialize array.
Read more

cytoscape.js - How to add nodes to Dagre layout with Cytoscape -

-
i trying add nodes dagre graph through cityscape.js. problem nodes not painted. code have: cy.add({ group: "nodes", data: { id:"n0",name:"n0",weight: 75 }, }); $.ajax(url).done(function(jsontree){ var newnodes=[]; for(var i=1;i<6;i++){ //var child = jsontree.result[i]; newnodes.push( { group: "nodes", data: { id: "n"+i, name:"n"+i}}, { group: "edges", data: { id: "e"+i, source: "n0", target: "n"+i } } ); } cy.add(newnodes); any ideas? have used loaded function reload graph not work. not know if have use specific function reload graph. thank in advance. you need add positions new nodes. cytoscape.js docs : it important note positions of newly added nodes must defined when calling cy.add(). nodes can not placed in graph without valid position — otherwise not displayed. yo
Read more