How can I input equations with multiple variables?
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Hello there guys;
I'm working on a problem where user is being asked for number of equations he wants to give to code to solve them. e.g. if user gives us n = 2, then there would be maximum 2 variables and equations. if user gives us n = 3, then would be 3 equations with 3 different variables. I'm facing issues with it and I'm using
F = eval(['@(x1,x2))',input("Write function f(x1,x2,...xn): ",'s')]);
but as we can see, I need to increase numbers of varables manually ( x1, x2 in this line ). But I want to make it much flexible and it can take any number of equations with any numbers of variables ( of course number of equtions would be equal to number of variables.
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Ameer Hamza
2020-11-26
evak is evil: https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval don't use it. It is better to use str2func() here. Following shows an example
n = 3;
xns = strjoin(compose('x%d', 1:n), ',');
func_str = input("Write function f(x1,x2,...xn): ",'s');
F = str2func(sprintf('@(%s) %s', xns, func_str));
2 个评论
abhisek singh
2020-11-26
Ameer Hamza
2020-11-26
You can find information about these functions in the documentation. For example, compose(): https://www.mathworks.com/help/matlab/ref/compose.html. You can type the name of the function in the search bar and see its documentation. Also, consider taking the free course: https://www.mathworks.com/learn/tutorials/matlab-onramp.html
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