# How to use List< List<vector> >

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 October 9, 2013, 11:12 How to use List< List > #1 Member   Join Date: Aug 2012 Posts: 76 Rep Power: 7 Sponsored Links Hi, == 1 == I defined the following list of the list of vectors. Code: `List< List > example(...);` == 2 == I populate this with a number of lists of vectors. e.g. list1, list2, list3 ... etc. == 3 == The question is that how I can reach one of the vectors inside example? For example, I can reach the 3rd vector inside a "List other_example" like that: Code: `Info << other_example[2] << endl;` But I couldn't achieve the same task for the list< list >. == 4 == In the end, I would like to use this example list of lists in for loops so that I can do some algeabraic operation with them. Many thanks for any help in advance.

 October 10, 2013, 04:33 #2 Member   Jan Join Date: Jul 2009 Location: Hamburg Posts: 66 Rep Power: 13 have you tried Code: `anotherExample[2][0]` ? HakikiCanakkaleli likes this.

 October 10, 2013, 05:01 #3 Member   Jan Join Date: Jul 2009 Location: Hamburg Posts: 66 Rep Power: 13 Code: ``` vector exampleVector = vector::zero; Info << "vector:" << tab << exampleVector << endl; scalar listLength(5); List exampleVectorList(listLength,vector::zero); forAll(exampleVectorList, i) { vector& v = exampleVectorList[i]; v = vector(i,2*i,3*i); Info << "vector:" << tab << v << endl; } Info << endl << endl; List > exampleVectorListList(listLength,exampleVectorList); forAll(exampleVectorListList,i) { List& vList = exampleVectorListList[i]; forAll(vList,j) { vector& v = vList[j]; Info << "vector:" << tab << v << endl; } }``` HakikiCanakkaleli likes this.

 October 10, 2013, 05:28 #4 Member   Join Date: Aug 2012 Posts: 76 Rep Power: 7 Many thanks for this reply. I had tried example[2][0] at the first hand; but, it seems I misunderstood the error message. Now, it confirmed that I made some other mistake. Many thanks.

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