This is a part of a code and I want to add something to it, description below

%This is a part of a code and I want to add something to it so instead of Deleting all the Users row from Heff that corresponding to P=0 in each itretion, I want to delete only the first row that corresponding to P=0 in each itretion        

do_Water_filling = 1;
while do_Water_filling
    W = pinv(Heff');  %Precoding Matrix
    W_bar = ((W./sqrt(sum(abs(W.^2),1))));
    D_Matrix = Heff'*W_bar; %Diagonal Matrix
    D_Square = (abs(diag(D_Matrix))').^2; %Channel Gains
    P = waterfill(Pt,Pn./D_Square);
    if any(P==0)
        Heff(:,P==0) = []; %Delete User Row
    else
        do_Water_filling = 0;
    end   
end 

[Rik]

Then you shouldn't do Heff(:,P==0) = [];. What have you tried so far to find the first occurence only of P==0?

[Awais Saeed]

what are the dimensions of your P and Heff? Or type

whos

to get the dimensions

[Matthew Worker]

you do not need dimensions, if P=0 if it is the third one in the P array that means the third row of Heff will be deleted,

but the problem sometimes P has more than one value equal to zero (you have zero in position 3 and 4 in the P array) so I want only the first value of P that is equal to zero so I will delete the third row of Heff, from this example in my code I will delete the row 3 and 4 and I do not want that, I only need to delete one row in each iteration so I want to delete the third row only.

[Matthew Worker]

I want to find the first zero value of P and delete the row of Heff that corresponding to this position

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[Mohammad Sami]

In your code

Heff(:,P==0) = []; %Delete User Row

This will actually delete columns not rows in Heff. Not sure if that is what you intended.

Anyways to delete only the first Row / Column in Heff, just use find function to return only the first index.

Heff(:,find(P==0,1)) = []; %find the first index of p == 0 and delete the corresponding col in Hef

[Matthew Worker]

yes you right I am sorry I want to delete the Heff Column