Inputing array value MATLAB

Question

Hi I have two arrays,

A = [23 Nan 45 Nan Nan 67 50 100 110] and B = [24 49 70 71 72 90 100 120 109]

NaN denotes some gap. I want to place the element of matrix B in the same location in A where it is NaN. For example, in array A 2nd position there is a gap, I want to put value 49 from matrix B into that position in array A. So the resulting A matrix becomes

A = [23 49 45 71 72 67 50 100 110]

Let me know how I can code it in MATLAB. Thanks,

I'm not sure how you have a string (x) in a numeric array in Matlab. — Nitish
– Nitish, Commented Aug 8, 2015 at 17:41
that is only to show missing value. It's a null. Instead of NaN, I put x in that place. — user962808
– user962808, Commented Aug 8, 2015 at 17:45

Nitish · Accepted Answer · 2015-08-08 17:52:29Z

2

You can do this very easily using array indexing.

A = [23 NaN 45 NaN NaN 67 50 100 110]
B = [24 49 70 71 72 90 100 120 109]
all_nans = isnan(A)
A(all_nans) = B(all_nans)

Giving:

A =

    23    49    45    71    72    67    50   100   110

all_nans contains the indices of all the NaNs and the next step basically does the required replacement.

answered Aug 8, 2015 at 17:52

Nitish

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1 Comment

Ben Hocking Over a year ago

It's worth pointing out that while you can also do A(isnan(A)) = B(isnan(A)), you can not do A(A == NaN) = B(A == NaN) like you would be able to do with -1 (or any other number), since NaN does not equal NaN.

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