if variable i = zero then change row j of the same row to 0 - table

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So I have a 5007717 x 16 Table and I changed all negative value of column 16 to zero. But now if column 16 is zero I want to change columne 3 of the same row to zero.
SO I tried things like
for i = 1:5007717
if pvdaqdata10(i,16) == 0
pvdaqdata10(i,3) = 0 ;
end
end
but it does'nt seem to work with table
Error: Incorrect use of '=' operator. To assign a value to a variable, use '='. To compare values for equality, use '=='.
Operator '==' is not supported for operands of type 'table'.
So my question is, how in a table do you change the value of a cell with respect to the value of a other cell of the same row and do that for each row ?
Thanks for your help
Regards

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