I am writing code for a function but I get an error message

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Adrian
Adrian 2012-5-4
I have to write a function (g) that satisfies several conditions.
I have tried to do this before, but never successfully.
This is what I have so far:
function mayday=g(x)
if x<-pi
mayday=-1;
elseif (x>=-pi)&&(x<=pi)
mayday=cos(x);
else mayday=sin(x)+cos(x);
end
When I call the function with individual x's, it works fine, but when define x as a vector
g(-2*pi:pi/4:2*pi)
I get the error message
Operands to the || and && operators must be convertible to logical scalar values.
Error in g (line 7)
elseif (x>=-pi)&&(x<=pi)
What am i doing wrong?
thanks for the help

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采纳的回答

Kye Taylor
Kye Taylor 2012-5-4
Just replace && with & and double pipes | | with | to operate on nonscalars.
  2 个评论
Walter Roberson
Walter Roberson 2012-5-4
That will eliminate the error message, but it will not eliminate the problem of trying to apply an "if" statement to a vector expression.
Kye Taylor
Kye Taylor 2012-5-4
An if statement can be applied to a vector expression. It is handled by matlab as
if(vector) = if(all(vector))
which may be the desired behavior.. probably not, but that's a different question.

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更多回答（2 个）

Walter Roberson
Walter Roberson 2012-5-4
Please read about logical indexing.
Peyman
Peyman 2012-8-9
NOT RELATED TO THE QUESTION: how did you right your question so clear! I used this help and it doesn't work for me!

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