MATLAB: Plus-minus function

equationfunctionhomeworkminusplus

How would I do the function

Y=B/2*(1-(4*X.^2)/L^2)*(1-Z.^2/D^2);

but before the B i need a plus and minus sign so the variable Y has all the values for positive and negative

Hi Sean,

You can do something like

Y=B/2*(1-(4*X.^2)/L^2)*(1-Z.^2/D^2);
Y = [Y -Y];

HTH

Hi Sean,

If you just want to plot, you should do

figure;
surf(X,Y,Z);
hold on;
surf(X,-Y,Z);

HTH

It depends what you want to do with it.

M = [1 1 1; 1 1 -1; 1 -1 1; 1 -1 -1; -1 1 1; -1 1 -1; -1 -1 1; -1 -1 -1];

Out = (M * Row')' ;

Each row of Out is what you want.

You might want to programatically generate M if you have more columns on your row.