wrev function on Matlab R2014a (Student) doesn't work ?

I keep getting an error when I try to run my following script.

if true
  % code
end
RL=[];
for s=1:length(subj),
  x=[];
  sr = [wrev(result_s{1,s}(1:5,dp)); wrev(result_s{1,s}(6:10,dp)); wrev(result_s{1,s}(14:15,dp))];
  sl = [result_s{1,s}(21:25,dp); result_s{1,s}(16:20,dp); result_s{1,s}(11:12,dp)];
  x(:,1)=sr;
  x(:,2)=sl;
  RL=[RL;x];
end;

>> Undefined function 'wrev' for input arguments of type 'double'.

[Geoff Hayes]

Anna - wrev is a function within the Wavelet Toolbox. Do you have this? In the Command Window, type

 ver

to see your version of MATLAB and all installed toolboxes.