matlab - Predefining one element of a row matrix where other elements are created via an equation -

i have matrix created via equation

for xxx = 1 : xmid_p - 2    ln_p(1,xxx) = abs(radius_p(1,1) - radius_p(xxx+1)); end  

however need equation have 0 first element. understand can via

ln_p(1,1) = 0; 

but how combine first element 0 , rest of row matrix taken equation above.

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solution:

it pretty simple , involved concatenating simple 1x1 matrix ln_p matrix.

lnzero(1,1) = 0  xxx = 1 : xmid_p - 2    ln_p(1,xxx) = abs(radius_p(1,1) - radius_p(xxx+1)); end   ln_p = horzcat(lnzero,ln_p) 

dirty trick maybe; use inside loop -

ln_p(1,xxx) = (xxx~=1).*(abs(radius_p(1,1) - radius_p(xxx+1)));