How to remove specific rows

Hello

I have two datas and they are corresponded. I want to delete rows which is zero value in a. And I also want to delete same rows in b(a and b are different datas so b doesn't have zero)

a=1000X1;    %a = [3 5 2 0 8 6 3 3 5 1 0 5 0 3 2 1 6 0 4 3 0 .........nonregular
b=1000X1;       

So first i found rows that have zero using below code

zerorows=find(a(:,1)==0);

And I know I can delete zero rows in a using below code.

a1=nonzeros(a);

Finally I want to delete a1 in b.

I've trying several methods like

b(a1,1)=[];

But nothing works.Thank you. And I can't use 'removerows' now. So I need other methods.

Answer 1

[KSSV]

idx = a == 0 ;  % find indices of zeroes in a  
b(idx) = [] ;   % remove the respective values from b  

If a is floating point numbers (which are mostly), you should prefer using this:

tol = 10^-5 ; 
idx = abs(a)<=tol ;  % find indices of zeroes in a  
b(idx) = [] ;   % remove the respective values from b