Error when computing the mean in Matlab

I have a double variable called Num_Firm_An with 3 columns and 60000 rows.

Num_Firm_An=[1994 12 19
1994  13  16
1994  16  12
1994  18  27
1994  19  15]

I tried the following two codes:

Code 1:

mean(Num_Firm_An(:,3))

Code 2:

year=1994:2013
for n=1:length(year)

      NFA=Num_Firm_An(Num_Firm_An(:,1)==year(n),:);

      m=mean(NFA(:,3));
      s=std(NFA(:,3));

      NFAmean{n}=m;
      NFAstd{n}=s;
   end

Code one gives the overall mean throughout the years. Code two should provide a final variable with both means and standard deviations for all the years.

Both codes are giving me the follwoing error: Index exceeds matrix dimensions. And I am not being able to solve it. Can someone help me? Thanks

Answer 1

[Azzi Abdelmalek]

mean([Num_Firm_An{:,3}])

[Maria]

It gives this error now: Cell contents reference from a non-cell array object.

[Andrew Reibold]

Make sure you have the same brackets everywhere maybe. [ straight ] vs { curly }

I copy pasted your code as well as Azzi's, and received no error.

[Maria]

I am trying different options and I always get an error. Do you think it's maybe because my variable it's a double?

[Azzi Abdelmalek]

Maria, [1 2] is a double array, {1 2} is a cell array. What do you have, double or cell array?

[Azzi Abdelmalek]

If your variable is double, your code is correct. But maybe, you have used the function mean as a variable in your code, rename this variable and try again.

You can check if the variable mean was used ( whos mean)

Try this

clear mean,% to clear the variable mean, you will be able to call the function mean 
Num_Firm_An=[1994 12 19
1994  13  16
1994  16  12
1994  18  27
1994  19  15]
mean(Num_Firm_An(:,3))

[Maria]

you are so right. I had a variable called mean that I had created by mistake. Sorry for the time. Thank you so much