MATLAB: Ignore spesific values in the plot

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how can i ignore one spesific value before i plot my funcion? for example i have to plot

y(i)=282*sqrt(1+cos(x(i))/sin(x(i)).^2) , x=[-0.13*pi:0.01:0.13*pi]

but i dont want the value for x=0.

x=[-0.13*pi:0.01:0.13*pi];
x = setdiff( x, 0 );

would be one way. Just creating x in the first place without it containing 0 would be another.

I suggest:

x=linspace(-2*pi,2*pi,200);
f=tan(x);
f(diff([0 f]) < 0) = NaN;

first_row  = cell_matrix(1,:);
random_row = cell_matrix(randperm(size(cell_matrix,1),1),:);

random_row = cell_matrix(randi(size(cell_matrix,1)),:);