Switch/case command function
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I'm trying to create a function with the switch /case commands and run it from another program satisfying certain criteria. The files are in the same folder but I'm not sure how to lay out the function and call it for that matter. Here is my function file:
function input = g(x) switch input case x < -pi disp('-1') case g >= -1 && g<= pi cos(g) case g > pi disp('-1')
end
Thanks for you help
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James
2012-3-28
Here is the function that does it (hopefully it is what you want)
function y=g(x)
if x < -pi
y=-1;
elseif (x >= -pi && x<=pi)
y=cos(x);
elseif x > pi
y=-1;
end
2 个评论
Angel Martinez
2012-3-28
James
2012-3-28
No problem. It seems that you are asking two questions. For the layout of the function and calling from another program:
You can create the function by going to matlab,
1.File -> New-> function
2.Delete everything and paste the code in the code above.
3.Save it at the same folder as your calling program.
4.To use this g function from the main program, just type y=g(x) e.g. g(pi) at your main program function whenever you need to compute g(x).
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James
2012-3-28
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Hi Angel,
I'm not sure if I fully understand your problem. However, just a quick glance on it, the case statement is not possible for inequality. I guess you have to use a list of if-elseif :)
Extracted from http://www.mathworks.com/help/techdoc/ref/switch.html: A case_expression cannot include relational operators such as < or > to compare against the switch_expression. To test for inequality, use if-elseif statements.
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2012-3-28
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