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Methods for calculating precise logarithm of a sum and subtraction

from Methods for calculating precise logarithm of a sum and subtraction by Roland Pihlakas
Methods for operating on log's of values without calculating the original values during the process

test_sub_lns() 
function test_sub_lns()

    a_ln = 710.0;
    b_ln = 709.5;
    
    a = exp(a_ln);
    b = exp(b_ln);
    
    R = a - b;
    
    R_ln = sub_lns(a_ln, b_ln);
    
    disp(['a_ln: ' num2str(a_ln) ' a: ' num2str(a, '%11.4g')]);
    disp(['b_ln: ' num2str(b_ln) ' b: ' num2str(b, '%11.4g')]);
    disp(['R_ln: ' num2str(R_ln) ' R: ' num2str(R, '%11.4g')]);

end

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