Re: function values vector

[Jaroslav Hajek]

On Fri, May 14, 2010 at 3:36 PM, mmasny <address@hidden> wrote:
>
> Hello, I'm a complete newbie, and after reading several tutorials still
> haven't solved the following problem:
> I have a vector x=linspace(0,2*pi,256). There is a function H given as
> follows:
>
> function y=H(x)
>    if (x<pi)
>        y=0;
>    else
>        y=1;
>    endif
> end
>
> Now, I want a vector Y such that each of its coordinates xi is H(xi). What's
> the best way to that? Y=H(X) doesn't work (it makes Y=1, which I don't
> understand). Do I need a loop to do that?

y = pi*(x >= pi);

or in 3.3.51+, a more powerful construct is

y = ifelse (x < pi, 0, 1);

-- 
RNDr. Jaroslav Hajek, PhD
computing expert & GNU Octave developer
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic
url: www.highegg.matfyz.cz