Defining (not plotting) a Piecewise Function with If, Else Statements

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Steven
Steven 2014-10-8
评论： Guillaume 2014-10-8
I have the following, which doesn't work. Does anyone have any recommendations? I need a simple piecewise constant function.
function [ x ] = m0( var1 )
if 0 <= var1 < 1/3 x = 1/sqrt(2); else if 1/3 <= var1 < 2/3 x = 0; else x = -1/sqrt(2); end end end

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Guillaume
Guillaume 2014-10-8
if 0 <= var < 1/3
is not valid syntax in matlab, you need to use logical operators:
if var1 >= 0 && var1 < 1/3
x = 1/sqrt(2);
elseif var1 >= 1/3 && var1 < 2/3
x = 0;
else
x = -1/sqrt(2);
end
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Guillaume
Guillaume 2014-10-8
Right, yes, it's valid syntax, but it's meaningless and certainly not what the author intended.
Guillaume
Guillaume 2014-10-8
Steven,
Yes, sorry, your function is only meant to work with scalars, and you're passing an array. This function would work:
y = function m0(x)
y = zeros(size(x));
y(x >= 0 & x < 1/3) = 1/sqrt(2);
y(x >= 2/3) = -1/sqrt(2);
end

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