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The laplace transform of step function, u(t), can be calculated by using _____(a) syms t; laplace(t/t)(b) laplace(1)(c) laplace(t/t)(d) sym t; laplace(t/t)This question was addressed to me in homework.Query is from Laplace Transform in portion Control System Applications of MATLAB

Answer»

The correct answer is (a) SYMS t; laplace(t/t)

The explanation: The laplace command won’t understand 1 is a UNIT function. ALSO, if we don’t define t as symbolic, it won’t be able to understand ‘t/t’. Finally, SYM t doesn’t properly define t for using it in the laplace command so we need to write t=sym(‘t’) while using the sym command. Instead of this, we write syms t to define it, as a symbolic variable, for the laplace command.



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