How to handle 'NaN' values

38 views (last 30 days)
Talat
Talat on 31 Mar 2011
em try to write code to find 'Interpolation error' but in Error metrix there occuring NaN at many place, even i have converted them in 'double()' now i want NaN value would replace by '0'or by its right value, Instead of NaN. plz help me . em trying to fix it bt it doesn't work.
{double(errors);
for i=1:1:size(errors, 1) for j=1:1:size(errors, 2) if errors(i, j)== 'NaN' errors(i, j)=0; else errors(i, j)=(errors(i, j)); end} end end this code is not working... i want not to occur ant NaN value during code processing. . . how do i write a code to avoide from such unwanted values. . .

Accepted Answer

Paulo Silva
Paulo Silva on 31 Mar 2011
errors(isnan(errors))=0
  1 Comment
Jan
Jan on 31 Mar 2011
And one vote for the correct answer reduced to the necesary minimum.

Sign in to comment.

More Answers (1)

Jan
Jan on 31 Mar 2011
This cannot work:
if errors(i, j)== 'NaN'
"error(i, j)" is a scalar DOUBLE, 'NaN' is a [1 x 3] CHAR vector, also known as "string". Even this would fail:
if errors(i, j) == NaN
because IEEE conventions state, that a comparison to NaN replies FALSE ever:
1 < NaN % >> 0
1 == NaN % >> 0
1 > NaN % >> 0
NaN == NaN % >> 0
Therefore isnan() must be used as shown in Paulo's answer.
  2 Comments
Talat
Talat on 31 Mar 2011
oh Thanks guy. . .
Paulo Silva
Paulo Silva on 31 Mar 2011
+1 vote for such detailed answer :)

Sign in to comment.

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!