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check for infinity [message #90042]

Tue, 20 January 2015 12:11

g.nacarts
Messages: 148
Registered: November 2013

Senior Member

Hi

I have a 3D array and I want to check if it contains an infinity. Is that possible? If so, any idea how to check it?

Thanks

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Re: check for infinity [message #90043 is a reply to message #90042]

Tue, 20 January 2015 13:52

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

See http://www.exelisvis.com/docs/FINITE.html

On 01/20/15 15:11, g.nacarts@gmail.com wrote:
> Hi
>
> I have a 3D array and I want to check if it contains an infinity. Is that possible? If so, any idea how to check it?
>
> Thanks
>

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Re: check for infinity [message #90044 is a reply to message #90042]

Tue, 20 January 2015 13:56

eshaya
Messages: 4
Registered: December 2014

Junior Member

On Tuesday, January 20, 2015 at 3:11:48 PM UTC-5, g.na...@gmail.com wrote:
> Hi
>
> I have a 3D array and I want to check if it contains an infinity. Is that possible? If so, any idea how to check it?
>
> Thanks

Result = Where(FINITE( Array , /INFINITY[, SIGN=value] EQ 1)
Sign = 1, if you want positive infinities only
Sign = -1, for negative infinities
Sign = 0, for both

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Re: check for infinity [message #90045 is a reply to message #90044]

Tue, 20 January 2015 15:06

g.nacarts
Messages: 148
Registered: November 2013

Senior Member

Thanks a lot

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Re: check for infinity [message #90046 is a reply to message #90042]

Tue, 20 January 2015 15:29

g.nacarts
Messages: 148
Registered: November 2013

Senior Member

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Re: check for infinity [message #90047 is a reply to message #90046]

Tue, 20 January 2015 15:33

g.nacarts
Messages: 148
Registered: November 2013

Senior Member

I've got one more question. Because my 3D array has thousands of elements I wanted to check whether Nans or infinity numbers exists but I cannot visualise all the outputs. My code is like this:

DataArray ; contains the 3D data

for i = 0, 199 do begin
for j = 0, 199 do begin
Barray = DataArray[*,i,j] - Array[i,j]
print, where(finite(Barray), /NAN))
endfor
endfor

I got the value -1 a lot of times, one printed after another . When I changed it to print, where(finite(Barray)) I got zeros. But I can only see in the last entries because the first are deleted. There is any other way? And what the -1 and 0 stands for?

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Re: check for infinity [message #90071 is a reply to message #90047]

Thu, 22 January 2015 13:57

Matthew Argall
Messages: 286
Registered: October 2011

Senior Member

See http://exelisvis.com/docs/WHERE.html

You might not want to use the Where() function. Just Finite().

Also, you can save yourself a for loop:

for i = 0, 199
print, finite(DataArray[i,*,*] - Array)
endfor

p.s. There are also ways of doing this without using a loop.

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