How to automatically modify matrix?

Hi, I've tryin to modify couple of matrices to make a histogram. (Matrix composed with time, azimuth and the elevation in order)

Time step is 60 secs and time in the first cloumn being change much when elevation becomes zero(7496s to 44977)

So i want to assign 4th column with 0,1 to indicate elevation is over 0deg (1 for over than 0 deg)

Is there any way i could automatically put "1" from 4620 to 7496 per seconds?

Also put "0" from 7497 to 44976 and "1" again from 44977 till end.

Please let me know if there's any solution available.

Thank you in advance.

                      4620         0.730141039279308                    15.993
                      4680         0.725690449686722                    15.692
                      4740         0.721309673264217                     15.39
                      4800         0.716998710011791                    15.085
                      4860         0.712757559929444                    14.778
                      4920         0.708603676309698                     14.47
                      4980         0.704519605860031                     14.16
                      5040         0.700487895287924                    13.847
                      5100         0.696543451178417                    13.533
                      5160          0.69266882023899                    13.218
                      5220         0.688864002469642                    12.901
                      5280         0.685128997870374                    12.582
                      5340         0.681463806441186                    12.261
                      5400         0.677868428182078                    11.939
                      5460         0.674342863093049                    11.616
                      5520           0.6708871111741                    11.291
                      5580         0.667501172425231                    10.964
                      5640         0.664185046846442                    10.636
                      5700         0.660921281145213                    10.307
                      5760         0.657744781906583                     9.977
                      5820         0.654620642545513                     9.645
                      5880         0.651566316354523                     9.312
                      5940         0.648581803333613                     8.978
                      6000         0.645667103482782                     8.642
                      6060         0.642804763509512                     8.306
                      6120         0.640012236706321                     7.968
                      6180          0.63728952307321                      7.63
                      6240         0.634619169317658                      7.29
                      6300         0.632018628732187                      6.95
                      6360         0.629487901316795                     6.608
                      6420         0.627009533778963                     6.266
                      6480         0.624600979411211                     5.922
                      6540         0.622244784921018                     5.578
                      6600         0.619958403600906                     5.233
                      6660         0.617724382158353                     4.887
                      6720          0.61556017388588                     4.541
                      6780         0.613448325490967                     4.193
                      6840         0.611388836973614                     3.845
                      6900          0.60939916162634                     3.497
                      6960         0.607479299449146                     3.147
                      7020         0.605594343856993                     2.797
                      7080         0.603779201434918                     2.447
                      7140         0.602016418890404                     2.096
                      7200          0.60032344951597                     1.744
                      7260         0.598682840019095                     1.392
                      7320          0.59709459039978                     1.039
                      7380         0.595558700658025                     0.686
                      7440          0.59407517079383                     0.332
                      7496         0.592748720562314                         0
                     44977          5.53847076864613                         0
                     45037          5.53972740570756                     0.363
                     45097          5.54094913618396                     0.728
                     45157          5.54211850678279                     1.094
                     45217          5.54325297079659                     1.461
                     45277          5.54433507493283                     1.828
                     45337          5.54538227248402                     2.195
                     45397          5.54637711015766                     2.563
                     45457          5.54731958795374                     2.932
                     45517          5.54820970587225                     3.302
                     45577          5.54906491720573                     3.671
                     45637          5.54986776866165                     4.042
                     45697          5.55061826024001                     4.413
                     45757          5.55133384523332                     4.785
                     45817          5.55197961705656                     5.157
                     45877          5.55259048229476                     5.529
                     45937           5.5531489876554                     5.902
                     45997          5.55365513313848                     6.276
                     46057          5.55410891874399                      6.65
                     46117          5.55451034447195                     7.025
                     46177          5.55485941032235                     7.399
                     46237          5.55515611629519                     7.775
                     46297          5.55540046239047                     8.151
                     46357          5.55559244860819                     8.527
                     46417          5.55573207494835                     8.904
                     46477          5.55581934141095                      9.28
                     46537          5.55583679470347                     9.658
                     46597          5.55580188811843                    10.036
                     46657          5.55573207494835                    10.414

Answer 1

[Star Strider]

Extracting a few rows to illustrate:

Matrix = [7380         0.595558700658025                     0.686
        7440          0.59407517079383                     0.332
        7496         0.592748720562314                         0
        44977          5.53847076864613                         0
        45037          5.53972740570756                     0.363
        45097          5.54094913618396                     0.728];

then:

Matrix(:,4) = 1.*(Matrix(:,3)>0)

produces:

Matrix =
         7380      0.59556        0.686            1
         7440      0.59408        0.332            1
         7496      0.59275            0            0
        44977       5.5385            0            0
        45037       5.5397        0.363            1
        45097       5.5409        0.728            1

.