create array of arrays from a single array

I have an array that looks like this:

0.000100000000000000	85	0.710500000000000	-0.118400000000000	0.00136500000000000	1.40700000000000
0.000500000000000000	85	0.710000000000000	-0.118200000000000	0.00136400000000000	1.40800000000000
0.00100000000000000	85	0.709300000000000	-0.118000000000000	0.00136300000000000	1.41000000000000
0.00250000000000000	85	0.707200000000000	-0.117400000000000	0.00135800000000000	1.41400000000000
0.000100000000000000	90	181.400000000000	0.0451000000000000	0.00324000000000000	0.00551300000000000
0.000500000000000000	90	0.726300000000000	-0.113200000000000	0.00142000000000000	1.37700000000000
0.00100000000000000	90	0.725500000000000	-0.113000000000000	0.00141900000000000	1.37800000000000
0.00250000000000000	90	0.723000000000000	-0.112400000000000	0.00141300000000000	1.38300000000000
0.00500000000000000	90	0.719100000000000	-0.111300000000000	0.00140600000000000	1.39100000000000
0.0100000000000000	90	0.711900000000000	-0.109100000000000	0.00139100000000000	1.40500000000000
0.0200000000000000	90	0.699300000000000	-0.104500000000000	0.00136300000000000	1.43000000000000
0.000100000000000000	95	192.400000000000	0.0474000000000000	0.00327100000000000	0.00519800000000000
0.000500000000000000	95	0.743800000000000	-0.108000000000000	0.00147700000000000	1.34400000000000
0.00100000000000000	95	0.742800000000000	-0.107800000000000	0.00147500000000000	1.34600000000000
0.00250000000000000	95	0.739800000000000	-0.107200000000000	0.00147000000000000	1.35200000000000
0.00500000000000000	95	0.735200000000000	-0.106200000000000	0.00146200000000000	1.36000000000000
0.0100000000000000	95	0.726700000000000	-0.104000000000000	0.00144600000000000	1.37600000000000
0.0200000000000000	95	0.712300000000000	-0.0995000000000000	0.00141700000000000	1.40400000000000
0.0300000000000000	95	0.700300000000000	-0.0948000000000000	0.00139200000000000	1.42800000000000
0.0400000000000000	95	0.690000000000000	-0.0900000000000000	0.00137000000000000	1.44900000000000

How do I create an array that holds arrays? Every time the value in column B changes, I want it to be a new array. How can I do this?

[KALYAN ACHARJYA]

Cell array?

Answer 1

[Star Strider]

If ‘A’ is your matrix:

A = [0.0001   85.0000    0.7105   -0.1184    0.0014    1.4070
     0.0005   85.0000    0.7100   -0.1182    0.0014    1.4080
     0.0010   85.0000    0.7093   -0.1180    0.0014    1.4100
                              . . .                          ];

[Uid,~,idx] = unique(A(:,2));                               % Unique ID Values
C = accumarray(idx,[1:size(A,1)]',[],@(x){A(x,:)});         % Submatrices

produces:

C1 = [C{1}]
C2 = [C{2}]
C1 =
    0.0001   85.0000    0.7105   -0.1184    0.0014    1.4070
    0.0005   85.0000    0.7100   -0.1182    0.0014    1.4080
    0.0010   85.0000    0.7093   -0.1180    0.0014    1.4100
    0.0025   85.0000    0.7072   -0.1174    0.0014    1.4140
    
C2 =
    0.0001   90.0000  181.4000    0.0451    0.0032    0.0055
    0.0005   90.0000    0.7263   -0.1132    0.0014    1.3770
    0.0010   90.0000    0.7255   -0.1130    0.0014    1.3780
    0.0025   90.0000    0.7230   -0.1124    0.0014    1.3830
    0.0050   90.0000    0.7191   -0.1113    0.0014    1.3910
    0.0100   90.0000    0.7119   -0.1091    0.0014    1.4050
    0.0200   90.0000    0.6993   -0.1045    0.0014    1.4300

and so for the rest.