How do I select data based on multiple indexes?

I have a data set called 'total_backscatternight'. I have three flags, 'water_data','Perp_saturationdata','Par_saturationdata', where I would like to select data from 'total_backscatternight' based on those three flags. However, once I select data after one flag, I get the error that 'Index exceeds the number of array elements (43696)'. How do I select the data based on all three flags?

My code:

%find data in ocean

water_data=find(landwatermask==7 | landwatermask==0);

Perp_saturationdata=find(PerpSurface_saturationflag==0);

Par_saturationdata=find(ParSurface_saturationflag==0);

t_backscatternight=total_backscatternight(:,562);

p_backscatternight=perp_backscatternight(:,562);

t_backscatternight=t_backscatternight(Perp_saturationdata);

p_backscatternight=p_backscatternight(Perp_saturationdata);

t_backscatternight=t_backscatternight(Par_saturationdata);

p_backscatternight=p_backscatternight(Par_saturationdata);

t_backscatternight=t_backscatternight(water_data);

p_backscatternight=p_backscatternight(water_data);

The files have been uploaded in different files.

Answer 1

[Kelly Kearney]

Assuming that the landwatermask, PerpSurface_saturationflag, and ParSurface_saturationflag matrices are all the same size, and they have the same number of elements as rows in total_backscatternight and perp_backscatternight:

mask = (landwatermask == 7 | landwatermask == 0) & ...
        PerpSurface_saturationflag==0 & ...
        ParSurface_saturationflag==0;

t_backscatternight = total_backscatternight(mask(:),562);
p_backscatternight = perp_backscatternight(mask(:),562);