How can I evaluate a multivariable symbolic function for certain input values?

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Baldemy 2017-11-1

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评论： Baldemy 2017-11-1

For example, say I've taken the partial derivative of a multivariable expression with variables x1, x2, x3... How can I evaluate that partial derivative by substituting certain values for those variables (the values could be assigned to non symbolic variables or in a matrix)? I realize this can be solved by repeating subs(function, variable, value) until all the variables but a new method would save a lot of time for repeated iterations.

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Answer 1

Walter Roberson 2017-11-1

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subs(symbolic_expression, list_of_variables, list_of_values)

If each value being substituted is a scalar, then list_of_variables can be a symbolic vector and list_of_values can be a numeric vector. If any of the values being substituted are non-scalar then list_of_variables needs to be a cell array of variables, and list_of_values needs to be a cell array of corresponding values.