не хотите оставить default значения?
Цитата:
Commonly used options
are scalar relative error tolerance 'RelTol' (1e-3 by default) and vector
of absolute error tolerances 'AbsTol' (all components 1e-6 by default).
If certain components of the solution must be non-negative, use
ODESET to set the 'NonNegative' property to the indices of these
components. The 'NonNegative' property is ignored for problems
where there is a mass matrix.
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