Why is polyfit giving me "NAN"

Hello,

I am curious why polyfit is returning 'nan'. My data set is finite and positive. I am attempting to study a power function and use it for my data. so here is what I have:

p = polyfit(log(x), log(y), 1);

However, I keep getting:

p = [nan nan] The dimensions of x and y are 1 column and 2617 rows

Please help and thank you so much!!

[dpb]

Range issue w/ log, most likely?

What is min(log()) and max for x, y?

You can try the scaling option to see if helps the numerics...

W/o a dataset, tough to say much more than "that's what the data say", sorry.

[Walter Roberson]

Do you possibly have duplicate x ?

[Image Analyst]

Does x or y have 0, or negative numbers, or nan's in them?

[Samuel Vergara]

I think you have zeros in X or Y. so log(0)=-inf. Try with cftool.

Regards.