How do you use the NaN function?

How would write a code that for a vector that is 500 data points long, but the first 123 data points are NaN?

Answer 1

[Abdolkarim Mohammadi]

You first create the NaN vector using nan(), then fill in the elements.

V = nan (500,1); 
V (124:end) = Data;

[Nicholas Deosaran]

wont that just make all 500 data points nan?

Just need to know how to make the 1st 124 nan and the rest 125-500...

[Abdolkarim Mohammadi]

The first line create the NaN vector and the second line fills it with your data. You may feel more comfortable with this syntax:

V (1:123) = NaN;

[Nicholas Deosaran]

I am still not understanding

the code will be like

v = (500,1)
data = (1:123)=nan

is that right or no?

[Abdolkarim Mohammadi]

No. If you have your vector of values for 125 to 500 and you want to transfer them to the new vector, then you should use:

V = nan (500,1); 
V (124:end) = Data;

Otherwise, if you have a 500 element vector and you want to eliminate the first 125 elements, then you can do it in one command (not the one you mentinoed):

Data (1:123) = NaN;