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From: Anthony Hopf on 14 May 2010 10:12
Hi everyone,

I have a little issue. Have a matrix of index values IND that I would like to use to index values in another matrix A... thing is IND has a bunch of NaN in it and I get a the error:
"??? Subscript indices must either be real positive integers or logicals."

when I do

TempA = A(IND);

This is due to the NaNs in IND. I found the following link which specifies a class that can be indexed my NaNs, but the problem is it will also return NaN values where NaN was used to index:

A=NanIndexable([10 20 30]);
IND = [2 nan 3];

>> A(IND) %The result you wanted

ans =

20 NaN 30

I want it to return nothing where IND is NaN... any ideas?

reference to the link i found on matlab central
http://www.mathworks.se/matlabcentral/newsreader/view_thread/265702

Thank you,

Tony
From: Steven Lord on 14 May 2010 10:23

"Anthony Hopf" <anthony.hopf(a)gmail.com> wrote in message
news:hsjlnl$o8g$1(a)fred.mathworks.com...
> Hi everyone,
>
> I have a little issue. Have a matrix of index values IND that I would
> like to use to index values in another matrix A... thing is IND has a
> bunch of NaN in it and I get a the error:
> "??? Subscript indices must either be real positive integers or logicals."

Then pull out the NaNs.

A(IND(~isnan(IND)))

--
Steve Lord
slord(a)mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ


From: Jan Simon on 14 May 2010 10:27
Dear Anthony!

> I have a little issue. Have a matrix of index values IND that I would like to use to index values in another matrix A... thing is IND has a bunch of NaN in it and I get a the error:
> "??? Subscript indices must either be real positive integers or logicals."
>
> when I do
> TempA = A(IND);

TempA = A(IND(isfinite(IND))
or
TempA = A(IND(~isnan(IND))

Jan
From: Anthony Hopf on 14 May 2010 14:05
"Jan Simon" <matlab.THIS_YEAR(a)nMINUSsimon.de> wrote in message <hsjmkb$pkq$1(a)fred.mathworks.com>...
> Dear Anthony!
>
> > I have a little issue. Have a matrix of index values IND that I would like to use to index values in another matrix A... thing is IND has a bunch of NaN in it and I get a the error:
> > "??? Subscript indices must either be real positive integers or logicals."
> >
> > when I do
> > TempA = A(IND);
>
> TempA = A(IND(isfinite(IND))
> or
> TempA = A(IND(~isnan(IND))
>
> Jan

Excellent... thank you Jan and Steve. This makes my find function look complicated but does the thing.
From: Jan Simon on 14 May 2010 15:19
Dear Anthony!

> > TempA = A(IND(isfinite(IND))

> This makes my find function look complicated but does the thing.

Complicated?!
Let me remember Matt Fig's:
regexprep(A,'([^/]+/)(?!/)','${strrep($1,$1,'''')}')
And Jason Breslau's equivalent:
regexprep(A,{'.*[^/]/(?!/)', '\s'},{'', '_'})
And Nathan's:
cellfun(@(x)strrep(x(max(regexp(x,'[^/]/[^/]'))+2:end),'','_'),A,'uni',false)
(all from the same thread here).

Have a nice day, Jan
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