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the piecewise function runs out a weird figure

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dcydhb dcydhb
dcydhb dcydhb 2019-3-12
编辑： Adam Danz 2022-6-6
function codes are as this
function f = myfun(x)
if (x<1);
f=x.^2 ;
else
f=x;
end
end
main program codes are as this
clc;
clear all;
close all;
x=0:0.1:10;
y=myfun(x);
plot(x,y)
a simple figure but a queer figure,why
  1 个评论
Adam Danz
Adam Danz 2019-3-12
Hint from
doc if
"An expression is true when its result is nonempty and contains only nonzero elements (logical or real numeric)."

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回答（1 个）

Voss
Voss 2022-6-3
Ran in:
x=0:0.1:10;
y=myfun(x);
plot(x,y)
function f = myfun(x)
idx = x < 1;
f = zeros(size(x));
f(idx) = x(idx).^2;
f(~idx) = x(~idx);
end

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