List of IDs to matrix of indexes

I have a list containing numbers like lijst = [1,1,1,2,2,3,3,3,3];

Now I want to make a matrix/cell array which counts up like:

A = [1,2,3;

4,5;

6,7,8,9];

(Essentially the number in the array is equal to the row in the matrix, and the number in the matrix is equal to the index of the array)

Is there a nice way to do this?

Answer 1

[madhan ravi]

v = 1:numel(list);
[u,~,c] = unique(list);
Wanted = arrayfun(@(x) v(list == x), u,'un',0);
% or
Wanted = accumarray(c,v,[],@(x){x.'});
celldisp(Wanted)

[Marleen van Dijk]

Thank you for the answer. It does not seem to be working for a longer list though. I now have a list ID:"1" "1" "1" "1" "1" "1" "1" "1" "1" "1" "2" "2" "2" "2" "2" "2" "2" "2" "2" "2" "3" "3" "3" "3" "3" "3" "3" "3" "3" "3" "4" "4" "4" "4" "4" "4" "4" "4" "4" "4" "5" "5" "5" "5" "5" "5" "5" "5" "5" "5" "6" "6" "6" "6" "6" "6" "6" "6" "6" "6" "7" "7" "7" "7" "7" "7" "7" "7" "7" "7" "8" "8" "8" "8" "8" "8" "8" "8" "8" "8" "9" "9" "9" "9" "9" "9" "9" "9" "9" "9" "10" "10" "10" "10" "10" "10" "10" "10" "10" "10" "11" "11" "11" "11" "11" "11" "11" "11" "11" "11" "12" "12" "12" "12" "12" "12" "12" "12" "12" "12" "13" "13" "13" "13" "13" "13" "13" "13" "13" "13" "14" "14" "14" "14" "14" "14" "14" "14" "14" "14" "15" "15" "15" "15" "15" "15" "15" "15" "15" "15" "16" "16" "16" "16" "16" "16" "16" "16" "16" "16" "17" "17" "17" "17" "17" "17" "17" "17" "17" "17" "18" "18" "18" "18" "18" "18" "18" "18" "18" "18" "19" "19" "19" "19" "19" "19" "19" "19" "19" "19" "20" "20" "20" "20" "20" "20" "20" "20" "20" "20" "21" "21" "21" "21" "21" "21" "21" "21" "21" "21" "22" "22" "22" "22" "22" "22" "22" "22" "22" "22" "23" "23" "23" "23" "23" "23" "23" "23" "23" "23" "24" "24" "24" "24" "24" "24" "24" "24" "24" "24" "25" "25" "25" "25" "25" "25" "25" "25" "25" "25" "26" "26" "26" "26" "26" "26" "26" "26" "26" "26" "27" "27" "27" "27" "27" "27" "27" "27" "27" "27" "28" "28" "28" "28" "28" "28" "28" "28" "28" "28" "29" "29" "29" "29" "29" "29" "29" "29" "29" "29" "30" "30" "30" "30" "30" "30" "30" "30" "30" "30" "31" "31" "31" "31" "31" "31" "31" "31" "31" "31" "32" "32" "32" "32" "32" "32" "32" "32" "32" "32" "33" "33" "33" "33" "33" "33" "33" "33" "33" "33" "34" "34" "34" "34" "34" "34" "34" "34" "34" "34" "35" "35" "35" "35" "35" "35" "35" "35" "35" "35" "36" "36" "36" "36" "36" "36" "36" "36" "36" "36" "37" "37" "37" "37" "37" "37" "37" "37" "37" "37" "38" "38" "38" "38" "38" "38" "38" "38" "38" "38" "39" "39" "39" "39" "39" "39" "39" "39" "39" "39" "40" "40" "40" "40" "40" "40" "40" "40" "40" "40" "41" "41" "41" "41" "41" "41" "41" "41" "41" "41" "42" "42" "42" "42" "42" "42" "42" "42" "42" "42" "43" "43" "43" "43" "43" "43" "43" "43" "43" "43" "44" "44" "44" "44" "44" "44" "44" "44" "44" "44" "45" "45" "45" "45" "45" "45" "45" "45" "45" "45" "46" "46" "46" "46" "46" "46" "46" "46" "46" "46" "47" "47" "47" "47" "47" "47" "47" "47" "47" "47" "48" "48" "48" "48" "48" "48" "48" "48" "48" "48" "49" "49" "49" "49" "49" "49" "49" "49" "49" "49" "50" "50" "50" "50" "50" "50" "50" "50" "50" "50"

If I try this list with your code it works for the first 10, but the next cell starts couting at 90. I would like the result to be 1 cell with 1 to 10, the next cell 11 to 20, etc.

[Marleen van Dijk]

I am confused now. When I try to use the function unique(ID) my output is:

"1" "10" "11" "12" "13" "14" "15" "16" "17" "18" "19" "2" "20" "21" "22" "23" "24" "25" "26" "27" "28" "29" "3" "30" "31" "32" "33" "34" "35" "36" "37" "38" "39" "4" "40" "41" "42" "43" "44" "45" "46" "47" "48" "49" "5" "50" "6" "7" "8" "9"

[Marleen van Dijk]

I just found out it does not work because ID consists of strings instead of doubles. Thanks for the help though!