How to get a nonzero elements of an input vector in SIMULINK?
Ryan Wang
Can anyone tell me what blocksets should I use to do the
same job as MATLAB function "find" does?
For example, if I have an input signal x = [1 0 -10 -2 2 3]
and I want to find elements great than zero, so the output
signal should be y =[ 1 2 3], how do I do this with
SIMULINK blocks?
Thanks for your help.
Navan
The Variable Selector block in Signal Processing blockset supports
logical indexing. But in Simulink the dimensions cannot change. So if
you use x > 0 as indices the output will be y = [1 2 3 0 0 0].
Navan
Ryan Wang
> logical indexing. But in Simulink the dimensions cannot change. So
> if
> you use x > 0 as indices the output will be y = [1 2 3 0 0 0].
>
> Navan
Oops, that's too bad. Maybe I should write a s-function istead.
Anyway, thanks for your concern.
Ryan
kumaraguru Mollin
In S-function v need to specify size of the output!!!.is generic
s-function is possible(with variable output)?
so i think even s-function will not workout for that problem.
Regards,
Mollin
杨
If you want to ger a nonzero elements of an input vector, and at
the same time change the dimensions of the vector, you can use the
following program:
x=input('input a arry, x=');
m=0;
n=length(x);
for i=1:n
if x(i)>0
m=m+1;
y(m)=x(i);
end
end
y
Ryan Wang
Thanks for your help first and your code does work in
MATLAB environment BUT failed in SIMULINK model.
Ryan
Ryan Wang
Thanks for ur kind reminder that the size of the ouput should be
initialized or defined in advance, which prohibits me from creating
dynanmical sized ouput.
Oh gee, what do I suppose to do?
Ryan
Jordan
you are doing with the output and determine if you can make it work a
fixed-length vector that is padded with zeros or some other value.
What do you want to do with this output after you get your vector?
