How can I compare two rows of an array withot for loop?

Hi! I want to compare two rows of an array. I want to do this:

I hace a = [1 NaN 2 NaN;[2 NaN NaN 3];

I want to create another array without using for loop iteration and obtain the next array

--> If both have a value I want to obtain the mean value of them.

--> if one of them have NaN I want to obtain the number

--> If both have NaN I want to delete it

I want to obtain this:

c = [1,NaN,2,3]

Answer 1

[Ameer Hamza]

Try this

a = [1 NaN 2 NaN];
b = [2 NaN NaN 3];
c = nanmean([a; b])

Result:

c =
    1.5000       NaN    2.0000    3.0000

[Collegue]

Thank you! and in the case that I want to substract the values instead of doing the mean?

[Ameer Hamza]

In subtraction, if there is a NaN. Do you want to consider it zero?

[Collegue]

YEs but know I want to sompare them. If both of them have a value I want to substract and if one of them have NaN obtain the other value

[Ameer Hamza]

Following code is for a-b, If both are NaN, the output is also NaN.

a = [1 NaN 2 NaN];
b = [2 NaN NaN 3];

x = [a;b];
mask = all(isnan(x));
c = nansum([a; -b]);
c(mask) = nan;

Result

>> c
c =
    -1   NaN     2    -3