help with ordering tables

dear colleages... i have a problem with a table... here is the problem....

i got a table named depth:

 depth(:,1)=a1; 
 depth(:,2)=g1;

 i need to create two new tables (submarine and aerea) each one composed by selected values of the table depth and also composed by two columns each one:

for submarine: i need all negative values of the second column of depth (depth(:,2), with each corresponding value of the first colum of depth (depth(:,1).

for aerea: the same but positve values...

i prepare this but dosent work

 submarine=find((depth(:,2)<0,:));
 aerea=find((depth(:,2)>0,:));

i think, find is not correct to be used in this case.... but what can i use?

thanx

Answer 1

[Walter Roberson]

submarine = depth(depth(:,2)<0, :);
aerea = depth(depth:,2)>0, :);

Question: what if the depth was exactly 0 ?

[Jules Ray]

if depth=0 is aerea

thanx