I am trying to calculate small numbers from equations like the one below.

p = -1e17 + sqrt(1e34 + 1e18)

I have tried using ‘vpa(-1e17 + sqrt(1e34 + 1e18), 30) but the output always comes out as p = 0.0. But p is not exactly zero and this propagates errors in subsequent calculations that involve p. Is there another way to retain sig figs to avoid rounding errors?I am trying to calculate small numbers from equations like the one below.

p = -1e17 + sqrt(1e34 + 1e18)

I have tried using ‘vpa(-1e17 + sqrt(1e34 + 1e18), 30) but the output always comes out as p = 0.0. But p is not exactly zero and this propagates errors in subsequent calculations that involve p. Is there another way to retain sig figs to avoid rounding errors? I am trying to calculate small numbers from equations like the one below.

p = -1e17 + sqrt(1e34 + 1e18)

I have tried using ‘vpa(-1e17 + sqrt(1e34 + 1e18), 30) but the output always comes out as p = 0.0. But p is not exactly zero and this propagates errors in subsequent calculations that involve p. Is there another way to retain sig figs to avoid rounding errors? precision, digits MATLAB Answers — New Questions

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