a problem with conditions and deleting rows

dear all, this is maybe a simple question but i can not find the way to solve it... may be you can help me...

i got a 1x4 (double) matrix named codename_station

 codename_station= 
77  79  90  79

i have also a big matrix named tab, composed by 6 columns and many rows, tab is also double

 tab=

 67  66  81  67  95.5400000000000  0.630000000000000
 80  85  72  69  31.9400000000000  0.990000000000000
 77  79  90  79  230.930000000000  2.59000000000000
 80  73  67  72  6.09000000000000  1.90000000000000
 84  69  84  65  12.1700000000000  0.570000000000000
 84  69  84  65  60.3900000000000  0.520000000000000
 67  79  78  84  438.610000000000  0.970000000000000
 77  79  90  79  74.6700000000000  1.02000000000000

 as you see the first four columns represent the coded name (double('string')), where the string is composed by four letters like CBQC or CONT etc....

how ever, i need to create a code to create a new table only with the rows the table tab, that coincide with the codename_station columns....

 i mean, i need a new table called tab2 (for example) with this data

 tab2=
 77  79  90  79  230.930000000000  2.59000000000000
 77  79  90  79  74.6700000000000  1.02000000000000

as you see the first four rows concede with the four rows of codename_station

i have been trying with this code:

 if tab(:,(1:4))~=codename_station(1,(1:4));

    tab(:,:)=[];

 end

but gives me an error that says

 Error using  ~= 
 Matrix dimensions must agree.

Answer 1

[Andrei Bobrov]

out = tab(ismember(tab(:,1:4),codename_station,'rows'),:)

[Jules Ray]

excellent... thanks