CODEWITHSUNDEEP
matlaboctave
user1242199
user1242199

Reputation:

how to replace Inf and NaN with zero using built in function

In octave, is there a build in function for replacing Inf/NaN to 0 in a vector

For example

a = log10([30 40 0 60]) => [1.4771 1.6021 -Inf 1.7782]

I can use finite or find function to find the index/position of the valid values but I don't know how to copy the values correctly without writing a function.

finite(a) => [1 1 0 1]

Upvotes: 14

Views: 42292

Answers (2)

Dominik
Dominik

Reputation: 792

Similarly for NaN, you can use isnan() to replace these elements with whatever you want.

Upvotes: 6

Gunther Struyf
Gunther Struyf

Reputation: 11168

>> a = log10([30 40 0 60])
a =
      1.477    1.602    -Inf    1.778

>> a(~isfinite(a))=0
a =
      1.477    1.602    0       1.778

does the trick, this uses logical indexing

~ is the NOT operator for boolean/logical values and isfinite(a) generates a logical vector, same size as a:

>> ~isfinite(a)
ans =
     0     0     1     0

As you can see, this is used for the logical indexing.

Upvotes: 24

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