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Help writing a simple function

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Kristopher
Kristopher 2014-6-20
编辑： per isakson 2017-9-17
I'm new to functions, and I was wondering how you would write a simple if, then function.
if x<4, then f(x)=-1
if 4<=x<=4 then f(x)=cos(x)
if x>4 then f(x)=1
%when an x is entered, it should give f(x) as the output. %Thank you.

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回答（3 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-6-20
Read the documentation, you will find examples if, elseif, else
David Sanchez
David Sanchez 2014-6-20
You should do as Azzi Abdelmalek says, anyway, here is your code:
if x<4
f = -1;
elseif x>=4 && x<=4
f = cos(x);
else
f = 1;
end
Andrei Bobrov
Andrei Bobrov 2014-6-20
编辑：Andrei Bobrov 2014-6-20
function out = f(x)
out = sign(x-4);
out(~out) = cos(4);
end
use
>> out = f([- 3 5 6 4 -2 3 1 4])
out =
-1.00000 1.00000 1.00000 -0.65364 -1.00000 -1.00000 -1.00000 -0.65364

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