Need to calculate the mean without considering the 0 counts. In [1 2 3 4 0 6 7], mean should be (1+2+3+4+6+7)/6 and then output place the mean of six number at place of 0.

Answer 1

[dpb]

>> v=[1 2 3 4 0 6 7];
>> v(v==0)=mean(v(v~=0))
v =
    1.0000    2.0000    3.0000    4.0000    3.8333    6.0000    7.0000
>> 

[MUDDASAR AYYUB]

Can do it from scratch? I don't want to use buit-in functions

[Steven Lord]

Without any built-in functions? No. The + operator is implemented as the built-in function plus.

If you want to do it specifically without the built-in mean function, yes. One approach would be to loop through the vector, adding up the elements of the vector and keeping track as you add each element to the total of how many non-zero elements you've seen. At the end divide.

[dpb]

Unless it's homework with such a condition, though, why would one not use logical addressing and mean(), though?

What's the point in having MATLAB if not going to use its features?