Help using switch statement

Question

Steven 2012-3-17

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https://ww2.mathworks.cn/matlabcentral/answers/32578-help-using-switch-statement

I have a problem dealing with a switch statement but I am having problems with it.

Here is the problem:

The following table gives the approximate values of the static coefficient of friction "u" for vaious materials.

Metal on metal, u=0.20
wood on wood, u=0.35
Metal on wood, u=0.40
Rubber on concrete, u=0.70

To start a weight 'W' moving on a horizontal surface, you must push with a force 'F', where F= u*W. Write a MATLAB program that uses the switch structure to compute the force 'F'. The program should accept as the input the value of W and the type of materials.

PLEASE HELP! Thank You.

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Oleg Komarov 2012-3-17

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

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Answer 1

Image Analyst 2012-3-17

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This doesn't make sense. You can't switch on the input W because switch normally takes fixed, discrete values (though you can put in an expression). Plus it just doesn't make any sense to switch on W since your formula doesn't have any multiple cases that are different depending on the value of W in any way, shape, or form - it's the same formula no matter what W is - it only depends on u, not W. You could switch on u, but your instructions didn't say how u was to be decided on. Are you going to ask the user for u (or the material type) also? If so, you could switch on u (or the material name) and inside the switch perform the F=u*W formula.